India’s Trusted Photovoltaic Cells Manufacturer: Inside Websol Energy System’s 30-Year Solar Legacy

Websol Branding on May 4, 2026

India's Trusted Photovoltaic Cells Manufacturer: Inside Websol Energy System's 30-Year Solar Legacy

India’s solar energy ambition is one of the most remarkable industrial stories of the 21st century. From less than 10 GW of installed capacity a decade ago, the country is racing toward 500 GW of renewable energy by 2030, with solar photovoltaics at the heart of that mission. Behind every megawatt of solar power lies a critical, often invisible component: the photovoltaic cell — the semiconductor unit that converts sunlight directly into electricity.

At Websol Energy System Ltd., we have been manufacturing photovoltaic cells in India since 1994 — making us one of the country’s earliest and most experienced solar cell producers. This article explores the science of photovoltaic cells, the state of India solar manufacturing, and why the choice of your photovoltaic cells manufacturer matters profoundly for long-term energy generation performance.

What Is a Photovoltaic Cell and How Does It Work?

A photovoltaic (PV) cell is a semiconductor device, typically made from silicon, that converts photons from sunlight into direct current (DC) electricity via the photovoltaic effect. When photons strike the silicon material, they excite electrons, causing them to flow through an external circuit — generating electricity.

Modern high-efficiency solar cells are far more sophisticated than the simple p-n junction devices of the 1960s. Today’s monocrystalline solar cells use:

Passivated Emitter and Rear Cell (PERC) architecture to reduce recombination losses
Bifacial designs that harvest light from both front and rear surfaces
Advanced anti-reflection coatings to maximise photon absorption
Fine-line metallisation printed with precision to reduce shading losses

The efficiency of a photovoltaic cell — the percentage of sunlight it converts to electricity — has climbed from around 6% in early commercial cells to over 23% in today’s premium monocrystalline solar cells. Every percentage point of efficiency gain translates directly into more electricity from the same roof area or land footprint.

Websol Energy System: A Photovoltaic Cells Manufacturer Built on Three Decades of Expertise

Websol Energy System Ltd. was incorporated in February 1990 and began commercial solar cell production in 1994. Founded through a collaboration between WEBEL (a West Bengal Government undertaking), S.L. Industries, and Helios Technology of Italy, Websol was conceived from the outset as a technologically driven photovoltaic manufacturer with global standards.

Over three decades, the company has evolved from a modest production unit to an advanced, fully automated solar manufacturing complex at Falta Special Economic Zone (SEZ), West Bengal — spread across seven acres and equipped with state-of-the-art process technology.

Key Milestones in Websol’s Solar Manufacturing Journey

Year	Milestone
1990	Company incorporated; collaboration with Helios Technology, Italy
1994	Commercial photovoltaic cell production begins at Falta SEZ
2005	Awarded the prestigious PV GAP mark
2011	Renamed Websol Energy System Limited
2023	Commissioned 600 MW Mono PERC bifacial cell line + 550 MW module line
2025	Second 600 MW cell line commissioned; total cell capacity reaches 1.2 GW
2028	Planned total capacity of 5.2 GW cells + 4.5 GW modules (TOPCon-based expansion)

This trajectory reflects not just corporate growth but the maturing of India’s solar manufacturing ecosystem — from early-stage, import-dependent assembly to integrated, export-quality domestic production.

The Science Behind Monocrystalline Solar Cells

All photovoltaic cells are not equal. The crystal structure of the silicon determines how efficiently it converts light to electricity. Monocrystalline solar cells — Websol’s specialisation — are grown from a single, continuous crystal lattice using the Czochralski process. This gives them:

Higher purity — fewer grain boundaries mean fewer sites where electrons recombine and are lost
Higher efficiency — typically 21–23.5% for modern M10 Mono PERC cells
Better temperature performance — lower power degradation at high temperatures, crucial for Indian climates
Longer operational life — superior cell-level consistency translates to predictable module-level output over 25+ years

At Websol, every batch of incoming monocrystalline wafers undergoes rigorous incoming quality inspection — measuring resistivity, thickness, total thickness variation, and minority carrier lifetime — before a single cell is processed. This upstream quality discipline is what separates a world-class photovoltaic cells manufacturer from commodity producers.

Websol’s Advanced Solar Technology: The M10 Bifacial Mono PERC Cell

The flagship product in Websol’s photovoltaic cell portfolio is the M10 Bifacial Mono-PERC Solar Cell — engineered to the 182 mm × 182 mm wafer standard that has emerged as the industry’s preferred format for high-wattage module manufacturing.

Key specifications and features of Websol’s M10 cell include:

Conversion efficiency: Up to 23%+
Bifacial design: Captures reflected and diffuse light from the rear side, delivering 5–30% additional energy yield depending on ground albedo and installation conditions
PERC architecture: Rear passivation layer reduces surface recombination, boosting Voc and FF
M10 wafer format: Enables module power classes of 525 Wp to 660 Wp, reducing balance-of-system (BoS) costs per watt
DCR compliance: Fully compliant with India’s Domestic Content Requirement regulations for government scheme projects

The combination of M10 size, bifacial design, and PERC architecture makes these cells ideal for utility-scale solar plants, commercial rooftops, and industrial solar applications across India’s diverse geographic and climatic conditions.

India Solar Manufacturing: The Strategic Context

India’s push to become a major solar manufacturing hub is backed by significant policy support. The Production Linked Incentive (PLI) scheme for solar PV modules, the Domestic Content Requirement (DCR) framework mandating Indian-made cells and modules for government projects, and the Approved List of Models and Manufacturers (ALMM) have collectively transformed the investment landscape for domestic solar manufacturers.

For project developers, installers, and EPCs, procuring from a verified domestic photovoltaic cells manufacturer like Websol is not merely a compliance necessity — it is a strategic advantage:

Supply chain security: No exposure to import duties, currency fluctuation, or port logistics delays
ALMM compliance: Websol’s cells and modules appear on MNRE’s approved list, enabling smooth project approvals
DCR eligibility: Critical for PM-KUSUM, PM Surya Ghar, and other government tenders
Technical support: Local manufacturer presence means faster resolution of technical queries and warranty claims

India’s domestic module manufacturing capacity listed under ALMM crossed 144 GW by late 2025 — a 99% year-on-year increase — signalling a historic shift toward self-reliance in solar technology.

Quality Certifications: What Sets a World-Class Solar Cell Manufacturer Apart

Websol Energy System’s photovoltaic cells and modules carry certifications from the world’s leading testing and certification bodies:

ISO 9001:2015 — Quality Management Systems
ISO 14001:2015 — Environmental Management Systems
ISO 45001:2018 — Occupational Health & Safety
IEC 61215 — Crystalline silicon terrestrial PV modules
IEC 61730 — PV module safety qualification
UL 1703 — Standard for flat-plate PV modules
TÜV Rheinland (Germany) — Performance and safety
BIS certification under IS 14286

These certifications are more than badges — they represent the manufacturing process controls, materials traceability, and testing protocols that guarantee consistent photovoltaic cell quality across every production batch.

Websol’s Manufacturing Infrastructure at Falta SEZ

The Falta SEZ facility is Websol’s technological heart. The manufacturing infrastructure includes:

Fully automated Mono PERC cell line (600 MW + 600 MW = 1.2 GW)
Solar module manufacturing line (550 MW)
In-line quality control systems at every production stage
Effluent Treatment Plant (ETP) for responsible chemical waste management
Advanced solar-powered utilities to reduce the facility’s own carbon footprint

The automation level at Falta ensures batch-to-batch consistency — a critical quality parameter for large solar projects where module-level mismatch can meaningfully reduce system output.

Why Websol for Your Solar Project?

Choosing the right photovoltaic cells manufacturer impacts every downstream metric: module power output, energy yield, degradation rate, warranty reliability, and project bankability. Websol’s value proposition rests on four pillars:

Technology Leadership Advanced M10 Mono PERC bifacial cells with >23% efficiency, with TOPCon upgrade roadmap already approved.
Manufacturing Scale and Reliability 1.2 GW cell capacity (expanding to 5.2 GW by 2028), operating at 90%+ utilisation — meaning consistent supply without lead time uncertainty.
Compliance and Certification Full ALMM listing, DCR compliance, IEC/UL certifications — removing procurement risk for government and private projects alike.

4. Legacy and Trust Three decades of Indian solar manufacturing, with a track record of delivering to domestic and international customers across utility, C&I, and residential segments.

Conclusion

India’s solar revolution runs on photovoltaic cells — and the quality, efficiency, and reliability of those cells determine the long-term value of every solar installation. As one of India’s most experienced and technically advanced photovoltaic cells manufacturers, Websol Energy System brings three decades of manufacturing expertise, globally certified quality, and a continuous technology upgrade roadmap to every cell it produces.

Whether you are a project developer building utility-scale solar, an EPC contractor sourcing DCR-compliant modules, or an industrial buyer seeking reliable high-efficiency solar technology, Websol’s made-in-India photovoltaic cells are engineered to deliver.

Frequently Asked Questions

Q1. What is the difference between a photovoltaic cell and a solar panel?

A photovoltaic cell is the individual semiconductor unit that generates electricity from sunlight. A solar panel (or module) consists of multiple PV cells electrically connected and laminated together in a weatherproof assembly. Websol manufactures both the cells and the finished modules.

Q2. Why are monocrystalline solar cells preferred over polycrystalline?

Monocrystalline cells offer higher efficiency (21–23%+ vs 17–18% for poly), better temperature coefficient performance, and longer operational reliability — making them the preferred choice for space-constrained installations and high-performance projects.

Q3. What wattage do Websol's M10 cells support in module form?

Websol’s M10 Bifacial Mono PERC cells enable module power classes of 525 Wp to 660 Wp, making them ideal for high-wattage module manufacturing.

Q4. Are Websol's photovoltaic cells compliant with India's DCR requirements?

Yes. Websol manufactures cells at its Falta, West Bengal facility in India, making them fully eligible for DCR-compliant government projects including PM-KUSUM and PM Surya Ghar.

Q5. What efficiency do Websol's solar cells achieve?

Websol’s M10 Bifacial Mono PERC solar cells achieve conversion efficiencies of over 23%, with ongoing technology roadmap targeting TOPCon-based cells exceeding 24%.

Q6. How does Websol ensure quality consistency in photovoltaic cell production?

Through fully automated production lines, in-line electroluminescence testing, automated optical inspection, and rigorous incoming material quality control — all aligned with ISO 9001:2015 and IEC standards.

Q7. What is Websol's manufacturing capacity?

Currently 1.2 GW of solar cell manufacturing capacity and 550 MW of module capacity, with expansion plans approved to reach 5.2 GW cells and 4.5 GW modules by 2028.

Rooftop Solar System Design for PM Surya Ghar Installers: A Technical Guide to Panel Selection and System Sizing

Websol Branding on April 28, 2026

Rooftop Solar System Design for PM Surya Ghar Installers: A Technical Guide to Panel Selection and System Sizing

Designing a rooftop solar system that maximises energy yield, meets PM Surya Ghar subsidy eligibility criteria, satisfies DISCOM net-metering requirements, and delivers excellent customer experience is a multi-dimensional challenge. For solar installers operating at volume in the government scheme space, having a standardised, technically sound system design protocol is the difference between profitable, repeat-business operations and costly rework, warranty claims, and subsidy rejections.

This technical guide covers every step of rooftop solar system design for PM Surya Ghar installers — from roof assessment and load analysis to panel selection, system sizing, and documentation.

Step 1: Site Assessment and Roof Evaluation

Structural Capacity

Before any system design begins, the roof structure must be assessed for load-bearing capacity. Standard M10 Mono-PERC bifacial modules weigh approximately 22–25 kg per module. A 3 kW system using 540 Wp modules requires 6 modules — approximately 140–150 kg of panel dead load, plus mounting structure. In older residential buildings, a structural assessment may be necessary before installation can proceed.

Shading Analysis

Shade is the single largest yield killer in residential rooftop solar. A shadow covering even 5% of a panel’s area can reduce its output by 30–50% due to current mismatch in series-connected cells. Installers must conduct a shading analysis using a solar pathfinder or digital tools, accounting for shadows from water tanks, parapets, AC units, antennas, and neighbouring buildings at the winter solstice sun angle — when shadows are longest.

Selecting M10 half-cut Mono-PERC modules significantly mitigates shading losses because each module operates as two independent half-strings. A shadow on one half does not proportionally affect the other half’s output — a critical advantage for urban rooftops with partial shading.

Step 2: Load Analysis and System Sizing

Determining Eligible Capacity Under PM Surya Ghar

Under PM Surya Ghar, the maximum subsidised capacity is linked to sanctioned load. The MNRE guidelines recommend system capacity sizing at 1 kW per 150 units (kWh) of monthly consumption, subject to DISCOM approval and available roof space. The maximum subsidised capacity is 3 kW for individual households, though larger systems can be installed with the incremental cost borne by the beneficiary.

Beneficiaries and installers can calculate eligible capacity and subsidy through the official PM Surya Ghar national portal at pmsuryaghar.gov.in.

Panel Count and Array Configuration

System sizing formula: System kW capacity ÷ Module Wp rating = Number of modules. For a 3 kW system using Websol’s 540 Wp M10 Mono-PERC bifacial modules: 3000 ÷ 540 = 5.56 → 6 modules (3,240 Wp installed). The slight over-sizing (3.24 kW vs 3 kW) is standard practice — it compensates for system losses including DC cable resistance, inverter efficiency, and soiling.

Step 3: Inverter Selection and String Configuration

The inverter must be appropriately sized to the array. A general rule: inverter AC output capacity should be 80–100% of array DC capacity. For a 3.24 kW array, a 3 kW or 3.3 kW grid-tie inverter is appropriate. For PM Surya Ghar installations, only grid-tie inverters with anti-islanding protection are permissible — essential for the safety of DISCOM line workers during grid outages.

String configuration must ensure that module Voc (open-circuit voltage) × number of modules in series does not exceed inverter maximum DC input voltage. For standard 540 Wp M10 modules with Voc ≈ 49 V, a 2-string configuration of 3 modules each is typical for 3 kW systems with string inverters.

Step 4: Selecting the Right Solar Module for PM Surya Ghar

Panel selection for PM Surya Ghar must balance four criteria: ALMM compliance, efficiency for available roof area, bifacial suitability for the specific installation type, and supplier reliability.

For a comparison of cell technology options relevant to residential rooftop design, review our guide on MonoPERC vs N-Type vs M10 cell technology selection.

Websol Energy System manufactures M10 Bifacial Mono-PERC cells optimised for Indian rooftop conditions. As a leading solar module manufacturer in India, Websol’s modules offer consistent efficiency, ALMM-eligible manufacturing, and comprehensive product documentation for government scheme installations.

Step 5: Net-Metering Application and DISCOM Coordination

All PM Surya Ghar installations must be connected to the grid through a net-metering arrangement. Installers are responsible for filing the net-metering application with the local DISCOM, along with system drawings, inverter specifications, and module datasheets. Processing times vary by state and DISCOM — plan for 4–12 weeks between installation completion and meter commissioning.

Document checklist for DISCOM and subsidy submission typically includes: module datasheets and ALMM certificate, inverter datasheet and CEC certification, single-line diagram, earthing and lightning protection documentation, installation photographs from multiple angles, and the signed net-metering agreement.

Step 6: Commissioning and Yield Verification

Post-installation, every PM Surya Ghar system should be commissioned with a system performance check: verify string voltages and currents with a DC clamp meter, confirm inverter is grid-connected and exporting, check monitoring portal for real-time generation data, and document the commissioning reading for subsidy claim purposes.

As a best practice, provide every customer with a projected monthly generation chart based on the site’s GPS coordinates and system size — this sets clear expectations and is a powerful tool for generating referrals.

Frequently Asked Questions

Q1: How many solar panels are needed for a 3 kW PM Surya Ghar installation?

Using 540 Wp M10 Mono-PERC modules: 3000 ÷ 540 = 5.56 panels → 6 panels for a 3.24 kW system. Using 400 Wp older generation modules: 3000 ÷ 400 = 7.5 panels → 8 panels. M10 modules allow fewer panels for the same capacity, reducing mounting structure complexity and cost.

Q2: What is the minimum roof area required for a 3 kW rooftop solar installation?

A 3 kW system using 6 standard M10 540 Wp modules (each approximately 2.2 m²) requires approximately 14–16 m² of usable shadow-free roof area, accounting for spacing between rows and access clearances.

Q3: Is bifacial solar recommended for PM Surya Ghar residential rooftops?

Bifacial modules can provide 5–10% additional yield from reflected light on light-coloured rooftops. They are recommended for installations with elevated mounting (50+ cm above roof surface) on white or light-grey roof surfaces. For flush-mounted dark roof installations, monofacial Mono-PERC performs comparably.

Q4: What inverter type is mandatory for PM Surya Ghar grid-connected installations?

Only grid-tie (grid-connected) inverters with anti-islanding protection and MNRE/BIS approval are permitted for PM Surya Ghar installations. Off-grid and hybrid inverters are not eligible for the scheme’s subsidy disbursement process.

Q5: Can installers submit PM Surya Ghar subsidy claims before net-meter installation?

No. Subsidy disbursement under PM Surya Ghar requires confirmation of grid connectivity and net-meter commissioning by the DISCOM. Installers should track DISCOM application status through the scheme portal at pmsuryaghar.gov.in and follow up proactively with the local DISCOM for timely meter installation.

India’s Solar Manufacturing Renaissance: What PM Surya Ghar and PM Kusum Mean for Domestic Cell and Module Producers

Websol Branding on April 24, 2026

India's Solar Manufacturing Renaissance: What PM Surya Ghar and PM Kusum Mean for Domestic Cell and Module Producers

India is experiencing a solar manufacturing renaissance. The combination of policy support — through the PLI scheme, ALMM framework, Basic Customs Duty (BCD) on imported modules, and the Domestic Content Requirement — alongside a demand surge from flagship schemes like PM Surya Ghar Muft Bijli Yojana and PM Kusum Yojana has created conditions for India’s solar cell and module manufacturing sector to scale at unprecedented speed.

For solar distributors and installers, this is not just background industry news. The expansion of domestic manufacturing directly affects supply availability, pricing, quality standards, and the long-term reliability of the modules they install. Understanding this transformation is essential for strategic sourcing and business planning.

The Policy Architecture Driving Manufacturing Growth

Basic Customs Duty (BCD) on Imported Modules

Since April 2022, India has imposed a 40% Basic Customs Duty on imported solar modules and 25% on imported solar cells. This tariff barrier has made imported Chinese modules uncompetitive for most Indian applications — particularly government-funded schemes — and created strong demand pull for domestically manufactured modules.

The PLI Scheme for Solar PV Manufacturing

The Production Linked Incentive scheme for high-efficiency solar PV modules provides manufacturers with financial incentives tied to production volume and efficiency thresholds. PLI has catalysed over ₹90,000 crore in committed investments in solar manufacturing — spanning polysilicon, ingots, wafers, cells, and modules — with the aim of creating a fully integrated domestic solar supply chain.

ALMM and DCR as Demand Guarantees

The ALMM framework ensures that government-funded installations use only certified domestic modules. Combined with DCR requirements in tenders under PM Kusum and certain PM Surya Ghar provisions, these policies create a guaranteed demand floor for ALMM-listed Indian manufacturers — giving manufacturers the demand certainty needed to invest in capacity expansion and quality upgrades.

Capacity Expansion: The Numbers

India’s solar module manufacturing capacity has grown from approximately 15 GW in 2021 to an estimated 60+ GW by end-2025, with cell manufacturing capacity also expanding rapidly. For context on where this trajectory is headed, read our analysis of the future of solar manufacturing in India, covering technology, policy, and growth trends.

Technology Upgradation Driven by Scheme Requirements

PM Surya Ghar’s efficiency requirements and PM Kusum’s performance demands are pushing domestic manufacturers to upgrade from older PERC technologies to higher-efficiency configurations. The shift from M6 to M10 wafer formats, the adoption of half-cut cell architectures, and the introduction of bifacial modules have all been accelerated by the quality bar set by government scheme specifications.

This technology evolution is covered in detail in our guide on why India’s solar module manufacturing sector is gaining global attention.

What This Means for Distributors and Installers

The expansion of India’s domestic solar manufacturing base has several direct implications for the supply chain:

Better availability: Growing domestic capacity reduces supply shortages and lead time delays that plagued the market in 2021–2023 when import disruptions exposed the risks of over-reliance on Chinese modules.

More competitive pricing: As domestic manufacturers scale production, per-unit manufacturing costs fall — improving module pricing for distributors without sacrificing margin.

Higher quality at accessible prices: PLI incentives tied to efficiency thresholds push manufacturers to produce higher-grade cells and modules, benefiting the entire supply chain.

Easier compliance: Sourcing from domestic ALMM-listed manufacturers simplifies the compliance documentation process for both PM Surya Ghar and PM Kusum installations.

Websol Energy System’s Place in This Transformation

Established in 1994, Websol Energy System is among the oldest and most experienced solar cell manufacturers in India. Operating its manufacturing facility in Falta, West Bengal, Websol has been part of India’s solar manufacturing story since its very beginning. Today, Websol manufactures M10 Bifacial Mono-PERC solar cells as a certified solar cell manufacturer in India and produces finished modules as a solar module manufacturer in India — serving the domestic government scheme supply chain and export markets with consistent quality.

Frequently Asked Questions

Q1: What is the current solar module manufacturing capacity of India?

As of 2026, India’s solar module manufacturing capacity exceeds 60 GW per annum — a dramatic increase from approximately 15 GW in 2021. Cell manufacturing capacity is also growing rapidly, driven by PLI scheme investments.

Q2: How does the PLI scheme benefit solar panel distributors and installers?

The PLI scheme incentivises domestic manufacturers to produce higher efficiency modules at scale, improving both module quality and supply availability. For distributors and installers, this translates into more ALMM-listed module options, better pricing over time, and reduced supply chain risk.

Q3: Why is BCD on imported solar modules important for Indian installers?

The 40% Basic Customs Duty on imported solar modules ensures that domestic manufacturers can compete on price, supporting the survival and growth of India’s solar manufacturing ecosystem. For PM Kusum and PM Surya Ghar installers with DCR requirements, BCD also reinforces the necessity of sourcing domestically.

Q4: Will domestic solar module prices decrease as manufacturing scales?

Yes, broadly. As domestic manufacturers achieve higher production volumes, per-unit manufacturing costs decrease — historical trends from China’s manufacturing scale-up confirm this pattern. Indian module prices are expected to continue declining progressively as capacity expands.

Q5: How does India's growing solar manufacturing sector benefit PM Surya Ghar programme delivery?

Growing domestic manufacturing capacity ensures supply availability for the massive volume of installations targeted under PM Surya Ghar — 1 crore households. It also reduces dependence on imports that could be disrupted by geopolitical factors, pricing volatility, or supply chain disruptions.

How Solar Module Quality Affects Long-Term ROI for Distributors and Installers in India

Websol Branding on April 20, 2026

How Solar Module Quality Affects Long-Term ROI for Distributors and Installers in India

In India’s fast-growing solar market, price competition among distributors and installers has never been fiercer. The pressure to win government scheme bids — whether for PM Surya Ghar or PM Kusum — often drives procurement decisions toward the cheapest available module. This approach is a false economy. Module quality has a profound and measurable impact on long-term energy yield, warranty claims, customer satisfaction, and ultimately, the distributor’s and installer’s business reputation.

This guide unpacks the specific quality parameters that drive solar module ROI — and why understanding them is as important as understanding subsidy structures.

The ROI Equation for Solar Modules

A solar module’s return on investment is not just about its purchase price. It is a function of three interrelated variables: initial energy generation (rated power), energy degradation rate over time, and the total cost of failures and warranty claims. A cheap module that degrades 1% faster per year than a premium module will lose approximately 15 kWh more energy per kW of installed capacity every year — that is a significant difference compounded over a 25-year project life.

For a 3 kW residential PM Surya Ghar installation, a 1% additional annual degradation means approximately 45 kWh less energy annually — equivalent to roughly ₹400–600 in lost electricity value per year at current rates. Across a 25-year system life, this compounds into a material reduction in customer savings, generating complaints and warranty claims that fall squarely on the installer.

Key Quality Parameters That Drive Module ROI

1. Cell Efficiency and Binning Precision

Higher cell efficiency means more power generated from the same roof or land area. More critically, the precision of efficiency binning — how tightly cells are sorted by power output before module assembly — determines mismatch losses within the module. A module from a manufacturer with tight binning controls will consistently outperform its rated power, while poorly binned modules may underperform nameplate capacity from day one.

2. Encapsulant and Backsheet Quality

The encapsulant (typically EVA or POE film) and backsheet are the module’s protection against environmental stressors — moisture, UV radiation, and thermal cycling. Low-quality encapsulants can yellow, delaminate, or develop micro-cracks over time, accelerating degradation. In India’s harsh outdoor conditions — monsoon humidity, intense UV, temperature swings — encapsulant quality is a critical determinant of module lifespan.

3. Frame Integrity and Anti-PID Design

The aluminium frame must provide structural integrity over 25 years of wind and snow loads (where applicable). More critically, high-quality modules incorporate anti-PID (Potential Induced Degradation) design in their cell-to-glass gap engineering and encapsulant formulation — essential for large ground-mounted PM Kusum installations where system voltages are high.

4. Junction Box and Cable Quality

The junction box is the module’s most vulnerable electrical component. Low-quality junction boxes with inferior bypass diodes are a common cause of field failures and fire risks. Installers should verify that modules use IP67 or IP68 rated junction boxes with TÜV-certified bypass diodes.

Annual Degradation: The Silent Margin Killer

Solar module datasheets universally quote a maximum linear degradation rate — typically 0.45–0.55%/year for Mono-PERC and 0.35%/year for TOPCon. However, real-world degradation depends heavily on manufacturing quality. Modules from poorly controlled manufacturing lines can degrade at 0.7–1% per year — nearly double the warranted rate — with no recourse available to the installer if the manufacturer lacks financial standing to honour warranty claims.

Partnering with an established domestic solar module manufacturer in India that has a demonstrable track record, financial stability, and accessible warranty service is the most reliable way to protect your business from long-term warranty risk.

Warranty Structures: What Distributors Must Scrutinise

A 25-year linear power output warranty is standard — but the warranty is only as strong as the company behind it. Distributors should evaluate manufacturer warranties on three dimensions: warranty terms (minimum 80% output at year 25), financial standing to honour long-term claims, and geographic presence for service support within India.

Websol Energy System’s modules are manufactured to international quality standards, with clear performance specifications for distributors sourcing for government scheme installations. Explore our solar cell manufacturer in India and module product range for detailed technical documentation.

Real-World Performance Testing Customers Expect

Educated solar customers in 2025 expect measurable proof of panel performance. Installers who can provide third-party flash test reports for installed modules — confirming that actual power output meets or exceeds rated power — build superior customer trust and reduce post-installation disputes. This requires sourcing from manufacturers with stringent flash testing and binning processes.

To understand the full range of solar cell technologies that impact performance and quality, visit our guide on understanding solar cell technologies including TOPCon, bifacial, half-cut, HJT, and Mono PERC.

Frequently Asked Questions

Q1: What is an acceptable annual degradation rate for solar modules in India?

For Mono-PERC modules, a maximum linear degradation of 0.45%/year is the quality standard. TOPCon modules should degrade no more than 0.35%/year. Modules with warranted degradation above 0.55%/year should be avoided for government scheme installations.

Q2: How does encapsulant quality affect solar panel lifespan in India?

PID (Potential Induced Degradation) occurs when high system voltages cause leakage currents through the glass-cell-encapsulant interface, degrading cell performance. Anti-PID design in the module’s construction is critical for large PM Kusum ground-mounted systems where system voltages may reach 1000 V.

Q3: What is PID and how does it affect solar module performance?

Q4: Is a 25-year warranty from every manufacturer equally reliable?

No. A warranty is only as reliable as the financial standing and operational continuity of the manufacturer. Installers should prioritise warranties from established domestic manufacturers with a verifiable track record, financial stability, and India-based service infrastructure.

Q5: How can installers verify module quality at the time of procurement?

Request and review third-party flash test reports from the manufacturing batch, IEC 61215 and IEC 61730 test certificates, independent EL (electroluminescence) imaging results for defect detection, and ALMM certification documentation.

TOPCon vs Mono-PERC vs HJT: Which Solar Cell Technology Should Indian Installers Choose in 2026?

Websol Branding on April 16, 2026

TOPCon vs Mono-PERC vs HJT: Which Solar Cell Technology Should Indian Installers Choose in 2026?

The solar cell technology landscape has never been more dynamic. In 2026, Indian solar installers and distributors are navigating a market where three distinct next-generation technologies — TOPCon, Mono-PERC, and HJT — coexist on supplier product sheets, each with distinct performance profiles, cost points, and suitability for different applications. Making the wrong technology choice for a PM Surya Ghar residential project or a PM Kusum agricultural installation can mean lower energy yields, customer complaints, and tighter margins.

This guide cuts through the marketing noise and gives you a clear, practical technology selection framework.

Technology Overview

Mono-PERC (Passivated Emitter and Rear Cell)

Mono-PERC is the current mainstream commercial technology. A passivation layer on the cell’s rear surface reduces electron recombination, boosting efficiency to 20.5%–22% in M10 bifacial configurations. It represents the best value-for-efficiency balance in the Indian market in 2026, with a mature manufacturing ecosystem, strong ALMM representation, and well-understood long-term degradation behaviour.

TOPCon (Tunnel Oxide Passivated Contact)

TOPCon is an N-type silicon cell technology that adds a thin tunnel oxide layer and a doped poly-silicon layer to the rear of the cell, dramatically reducing recombination losses. Module efficiencies of 22%–24% are achievable. TOPCon cells have lower temperature coefficients (around -0.28%/°C vs -0.35%/°C for PERC) and lower LID/LeTID degradation, making them particularly suited for high-temperature Indian environments.

HJT (Heterojunction Technology)

HJT cells combine crystalline silicon with thin amorphous silicon layers, producing efficiencies of up to 24%–25%. HJT has an exceptional temperature coefficient (around -0.25%/°C) and outstanding low-light performance — useful for cloudy or haze-prone regions. However, HJT manufacturing requires specialised equipment (PECVD systems) and is significantly more capital-intensive, reflecting in higher module pricing.

Head-to-Head Performance Comparison

Efficiency: HJT > TOPCon > Mono-PERC. HJT reaches 24%+, TOPCon reaches 22–24%, Mono-PERC reaches 20.5–22%.

Temperature Coefficient: HJT (-0.25%/°C) > TOPCon (-0.28%/°C) > Mono-PERC (-0.35%/°C). All three perform well, but HJT and TOPCon have an edge in India’s hot summers.

Degradation Rate: Mono-PERC: ~0.45–0.5%/year. TOPCon: ~0.35–0.4%/year. HJT: ~0.25–0.3%/year. Over a 25-year project life, this matters significantly for energy yield forecasting.

Cost (Module Price): Mono-PERC remains most affordable at scale. TOPCon commands a 5–15% premium. HJT carries a 25–40% premium over PERC, limiting its addressable market in price-sensitive Indian government tenders.

ALMM Availability: Mono-PERC has the widest ALMM listing coverage in India. TOPCon listings are growing. HJT ALMM listings are currently limited.

Application-Specific Recommendations

PM Surya Ghar Residential Rooftops (1–3 kW)

Mono-PERC M10 bifacial is the optimal choice — highest ALMM availability, proven residential performance, lowest cost, and compact footprint suitable for small rooftop areas. TOPCon is an alternative for customers seeking premium performance and are willing to pay slightly more.

PM Kusum Component A Ground-Mounted Plants (500 kW–2 MW)

TOPCon modules offer the best balance of high efficiency, lower degradation, and manageable price premium for large ground-mounted installations where land area optimisation and long-term energy yield are critical to project IRR. Bifacial TOPCon modules are particularly effective in open agricultural field settings.

PM Kusum Component B Agricultural Pumps (Standalone)

Mono-PERC M10 remains the practical choice for standalone agricultural pump systems, given cost sensitivity and the non-critical nature of 1–2% efficiency differences in pump applications sized with adequate margin.

What India’s Manufacturing Landscape Offers

India’s domestic solar cell manufacturing is primarily centred on Mono-PERC technology, with TOPCon capacity ramping up rapidly. For an understanding of where Indian solar cell manufacturing is headed, our analysis of the future of solar manufacturing in India covers the technology transition timeline in detail.

Websol Energy System currently manufactures M10 Bifacial Mono-PERC solar cells — the technology that strikes the optimal balance for current Indian government scheme requirements. As a leading solar module manufacturer in India, Websol provides verified, ALMM-eligible modules for PM Surya Ghar and PM Kusum supply chains.

Frequently Asked Questions

Q1: Is TOPCon better than Mono-PERC for Indian solar installations?

TOPCon offers higher efficiency (22–24% vs 20.5–22%) and lower degradation, but at a 5–15% price premium. For PM Surya Ghar residential installations where cost is primary, Mono-PERC remains optimal. For large PM Kusum ground plants where long-term yield matters more, TOPCon is increasingly competitive.

Q2: What is the temperature coefficient and why does it matter in India?

The temperature coefficient of power (Pmax) measures how much panel efficiency drops per degree Celsius above 25°C. HJT (-0.25%/°C) and TOPCon (-0.28%/°C) outperform Mono-PERC (-0.35%/°C) in hot Indian summers, generating more power when temperatures are highest.

Q3: Is HJT solar technology available for PM Surya Ghar installations?

HJT modules are technically eligible if ALMM listed, but their significantly higher cost makes them uneconomical for typical PM Surya Ghar residential projects where subsidy-to-system-cost ratios are optimised using Mono-PERC or TOPCon modules.

Q4: Which solar cell technology has the lowest annual degradation rate?

HJT has the lowest annual degradation rate at approximately 0.25–0.3%/year, followed by TOPCon at 0.35–0.4%/year and Mono-PERC at 0.45–0.5%/year. Lower degradation directly translates to higher cumulative energy yield over the panel’s 25-year life.

Q5: Can TOPCon modules be used for PM Kusum Component A tenders?

Yes, provided the modules are ALMM listed, BIS certified, and meet DCR requirements (domestically manufactured cells and modules). TOPCon’s higher efficiency is particularly advantageous for Component A ground-mounted plants where land area efficiency affects project sizing and bid competitiveness.

Solar Cell Manufacturing in India: How Domestic Production Powers the PM Surya Ghar and PM Kusum Supply Chain

Websol Branding on April 13, 2026

Solar Cell Manufacturing in India: How Domestic Production Powers the PM Surya Ghar and PM Kusum Supply Chain

India’s solar energy ambition is staggering. The government has set a target of 500 GW of renewable energy capacity by 2030, with solar accounting for the bulk of the expansion. Driving this transition is not just installation activity — it is a parallel revolution in domestic solar manufacturing, particularly in solar cell and module production. For distributors and installers serving PM Surya Ghar and PM Kusum, understanding how solar cells are made in India — and which manufacturing steps affect panel quality — is essential for making informed procurement decisions.

The Solar Cell Manufacturing Process: A Step-by-Step Overview

Step 1: Silicon Ingot and Wafer Production

Solar cell manufacturing begins with high-purity polysilicon, which is melted and grown into single-crystal silicon ingots using the Czochralski (CZ) process for monocrystalline silicon. These ingots are then sliced into ultra-thin wafers using diamond wire saws — currently standardised at 182 mm × 182 mm (M10 format) for leading Indian manufacturers.

Step 2: Cell Processing — Diffusion, Passivation, and Metallisation

The wafer undergoes a sequence of chemical and thermal processes: surface texturing to improve light trapping, diffusion to create the p-n junction that drives the photovoltaic effect, and anti-reflection coating (ARC) deposition. For Mono-PERC cells, an additional rear-side passivation layer is applied — this is what defines the PERC (Passivated Emitter and Rear Cell) architecture and accounts for its efficiency advantage over standard BSF (Back Surface Field) cells.

Finally, silver and aluminium contacts are screen-printed and fired at high temperatures to form the cell’s electrical connections. This metallisation step is critical — the precision of silver paste deposition directly affects cell efficiency and long-term degradation rates.

Step 3: Quality Testing and Binning

Every cell is tested under a Solar Simulator under Standard Test Conditions (STC: 1000 W/m², 25°C, AM 1.5G spectrum). Parameters measured include open-circuit voltage (Voc), short-circuit current (Isc), maximum power (Pmax), fill factor (FF), and efficiency (η). Cells are sorted (binned) by power output — typically in 0.1 W bins — to ensure matched cells are used in each module for consistent performance.

What Makes a High-Quality Solar Cell?

Not all solar cells are equal, even from the same manufacturing line. Key quality indicators that distributors should understand include:

Low Light-Induced Degradation (LID): In p-type mono silicon cells, boron-oxygen defects can cause initial efficiency loss of 1–3% in the first weeks of light exposure. Premium manufacturers use LID mitigation techniques including light and elevated temperature annealing processes.

Low Potential Induced Degradation (PID) Resistance: PID can cause significant power loss in field conditions due to leakage current. High-quality cells and encapsulants are designed to resist PID, which is particularly important for large ground-mounted PM Kusum installations where system voltages are high.

Tight Efficiency Distribution: A narrow spread (tight binning) within a production batch ensures consistent module output and minimises mismatch losses in strings and arrays.

India’s Solar Cell Manufacturing Landscape

India’s solar cell manufacturing capacity has grown substantially, with several established manufacturers producing cells across the M6 and M10 wafer formats. For a complete overview of the manufacturers operating in this space, refer to our guide to solar cell manufacturers in India.

Websol Energy System has been manufacturing solar cells in India since 1994 — among the earliest entrants in the Indian solar cell manufacturing space. Operating from its advanced manufacturing facility in Falta, West Bengal, Websol produces M10 Bifacial Mono-PERC cells that serve the quality requirements of both domestic government schemes and export markets. Visit our solar cell manufacturer in India page for technical specifications.

The PLI Scheme and Its Impact on Solar Cell Quality

The Production Linked Incentive (PLI) scheme for solar PV manufacturing — managed by the Ministry of New and Renewable Energy — provides financial incentives to manufacturers who achieve high efficiency thresholds and domestic sourcing percentages. This has driven Indian manufacturers to invest in higher efficiency cell technologies and tighter quality control, ultimately benefiting distributors and installers who source from PLI-participating manufacturers.

To understand the broader trajectory of Indian solar manufacturing, read our analysis of the future of solar manufacturing in India — technology, policy, and growth trends.

Why Domestic Solar Cells Matter for PM Kusum and PM Surya Ghar Installers

Both PM Kusum and PM Surya Ghar prioritise domestically manufactured modules through ALMM compliance and DCR requirements. Sourcing from a domestic solar cell manufacturer directly reduces supply chain risk — no import delays, no customs compliance issues, and full traceability of the manufacturing process for government audits.

Additionally, domestic manufacturers can provide technical support, rapid replacement in warranty situations, and documentation that meets MNRE’s evolving compliance requirements — advantages that imported modules simply cannot match at scale.

Frequently Asked Questions

Q1: What is the difference between a solar cell and a solar module?

A solar cell is the smallest photovoltaic unit that converts sunlight into electricity. A solar module (or panel) is made by connecting multiple solar cells (typically 60, 72, 120, or 144 cells) in a laminated assembly with glass, encapsulant, backsheet, and a frame — forming the finished product installed on rooftops or ground.

Q2: What does PERC stand for in Mono-PERC solar cells?

PERC stands for Passivated Emitter and Rear Cell. The ‘passivation’ refers to a dielectric layer applied to the rear of the cell that reduces electron recombination, allowing more electrical current to be generated from the same amount of incident sunlight — boosting efficiency by 1–2% absolute compared to standard BSF cells.

Q3: Why does cell binning matter for solar module quality?

Modules are constructed from cells of matched power output. If cells with wide efficiency spread are mixed in a module, the weakest cell limits current flow in its string — a phenomenon called current mismatch. Tightly binned cells minimise mismatch losses, resulting in higher-than-rated real-world energy generation.

Q4: How does LID affect solar panel performance in India?

LID (Light-Induced Degradation) causes initial efficiency loss in the first weeks of outdoor operation due to boron-oxygen complex formation in p-type cells. In Indian high-irradiance conditions, this can manifest quickly. Premium manufacturers use annealing or alternative cell structures to minimise LID below 1%.

Q5: What should distributors look for in a solar cell manufacturer for PM Surya Ghar supply?

Look for ALMM listing, BIS and IEC certification, M10 Mono-PERC or higher cell technology, tight cell efficiency binning data, warranty documentation, and DCR compliance capability. Established domestic manufacturers with a track record of government scheme supply are strongly preferred.

M10 Bifacial Mono-PERC Solar Cells: Why This Technology Dominates India’s Solar Module Market in 2026

Websol Branding on April 10, 2026

M10 Bifacial Mono-PERC Solar Cells: Why This Technology Dominates India's Solar Module Market in 2026

If you are a solar panel distributor, installer, or procurement manager sourcing modules for Indian government schemes like PM Surya Ghar or PM Kusum, there is one solar cell format that keeps appearing at the top of every supplier’s product sheet: M10 Bifacial Mono-PERC. Understanding why this technology has become the industry standard in India — and why it outperforms alternatives in real-world conditions — is essential knowledge for every solar supply chain professional in 2026.

What Is an M10 Solar Cell?

The M10 designation refers to a specific wafer size standard in the solar industry — 182 mm × 182 mm. This wafer size represents a significant step up from the older M6 (166 mm) and G1 (158.75 mm) formats. When paired with Mono-PERC (Passivated Emitter and Rear Cell) technology and a bifacial design — which allows the cell to absorb light from both front and rear surfaces — you get a product that offers some of the most compelling efficiency and output numbers available in crystalline silicon technology today.

For a comprehensive deep-dive into M10 cell efficiency data, output benchmarks, and manufacturing benefits, visit our dedicated page on M10 solar cells — efficiency, output, and manufacturing advantages.

The Technical Advantages of M10 Bifacial Mono-PERC

1. Higher Power Output per Module

Larger wafer area means more photons can be captured per cell. An M10 Mono-PERC module typically delivers 530 Wp to 560 Wp in a standard 60-cell (half-cut, 120-cell) configuration — compared to 375–400 Wp from older M6 cells. This means fewer modules are needed for the same system capacity, reducing balance-of-system (BOS) costs including mounting structures, cables, and labour.

2. Bifacial Gain in Indian Conditions

The bifacial design enables the rear of the panel to absorb reflected albedo light from the ground surface. In Indian rooftop conditions with light-coloured surfaces or elevated mounting, bifacial gains typically range from 5% to 15%. In ground-mounted agricultural installations typical of PM Kusum Component A projects — especially in open, bright fields — rear-side gains can approach 20%, significantly improving energy yield.

3. Half-Cut Cell Architecture

Most M10 modules use half-cut cell technology, which divides each cell into two halves. This reduces resistive losses and improves performance in partial shading conditions — extremely relevant for residential rooftops where shadows from water tanks, antennas, or adjacent structures are common. Half-cut cells also run cooler, extending module lifespan.

4. Excellent Temperature Coefficient

M10 Mono-PERC cells typically exhibit a temperature coefficient of power (Pmax) around -0.35%/°C. Given that module surface temperatures in India can easily reach 60–70°C in summer, a tight temperature coefficient translates directly to preserved energy output during the hottest parts of the day — when electricity demand (and its value) peaks.

Manufacturing Advantages That Benefit Distributors

M10 cells are not only technologically superior — they are also easier to manufacture at high volume and consistent quality due to the maturity of the M10 production ecosystem. Leading solar cell manufacturers in India have invested heavily in M10-compatible production lines, meaning supply reliability is strong.

Websol Energy System, operating as a certified solar cell manufacturer in India, manufactures M10 Bifacial Mono-PERC solar cells at its facility in Falta, West Bengal — equipped with advanced automation and stringent quality control for consistent cell efficiency across production batches.

How M10 Cells Perform Across India’s Solar Applications

PM Surya Ghar Residential Rooftops

For 1 kW–3 kW residential rooftop systems, M10 modules allow system integrators to deliver higher capacity within limited roof space. A typical 3 kW system using M10 540 Wp modules requires only 6 panels — versus 8 panels with older 375 Wp modules — reducing structural load and installation complexity.

PM Kusum Agricultural Installations

In ground-mounted Component A and C installations, M10 bifacial modules deliver measurably better energy yield per square metre of land use. Higher bifacial gain in open agricultural fields further improves project economics, making M10 bifacial the preferred choice for competitive bid pricing.

M10 vs Other Cell Technologies: A Quick Comparison

M10 Mono-PERC Bifacial vs TOPCon: TOPCon offers slightly higher efficiency (22%–24%) but at significantly higher manufacturing cost. For most PM Surya Ghar and PM Kusum applications, M10 Mono-PERC hits the optimal efficiency-cost sweet spot.

M10 Mono-PERC Bifacial vs HJT: HJT (Heterojunction Technology) offers excellent low-light performance but involves higher capital cost and more complex manufacturing. M10 Mono-PERC remains more commercially accessible for Indian government scheme volumes.

For a detailed technology comparison, read our guide on MonoPERC vs N-Type vs M10 solar cell technology selection.

Frequently Asked Questions

Q1: What does M10 mean in solar cells?

M10 refers to the wafer size standard of 182 mm × 182 mm used in solar cell manufacturing. It represents a newer, larger wafer format that enables higher power output per module compared to older M2, M6, and G1 wafer sizes.

Q2: What is the typical efficiency of M10 Mono-PERC bifacial solar cells?

M10 Mono-PERC bifacial solar cells typically achieve module efficiencies between 20.5% and 22%, with front-side cell efficiencies commonly in the 21–22.5% range in leading Indian manufacturing facilities.

Q3: Are M10 bifacial modules suitable for PM Surya Ghar rooftop installations?

Yes. M10 bifacial Mono-PERC modules are well-suited for PM Surya Ghar installations, offering higher power output in less roof space, good temperature performance, and compliance with MNRE efficiency standards.

Q4: What bifacial gain can be expected from M10 modules in India?

In typical Indian rooftop and open-ground conditions, bifacial gain ranges from 5% to 20% depending on mounting height, tilt angle, and ground surface reflectivity (albedo). Light-coloured or reflective surfaces maximize rear-side energy capture.

Q5: What is the power output range of M10 Mono-PERC bifacial modules?

Depending on configuration and number of cells, M10 Mono-PERC bifacial modules typically output 525 Wp to 575 Wp per module — significantly higher than older generation 144-cell modules using G1 or M6 wafers.

PM Kusum Yojana for Solar Installers: Component Standards, Sourcing Strategy, and Technical Compliance

Websol Branding on April 7, 2026

PM Kusum Yojana for Solar Installers: Component Standards, Sourcing Strategy, and Technical Compliance

Pradhan Mantri Kisan Urja Suraksha evam Utthaan Mahabhiyan — better known as PM Kusum Yojana — is among the most ambitious agricultural solar schemes in the world. With a combined target of 30.8 GW of solar capacity across its three components and a budget outlay that crosses ₹34,000 crore, this scheme represents a transformative opportunity for solar installers, distributors, and panel suppliers across India.

But capitalising on PM Kusum’s potential requires more than sales — it demands technical knowledge of the scheme’s component structures, power output requirements, panel specifications, and compliance frameworks. This guide provides a practical reference for every stakeholder operating in the PM Kusum solar supply chain.

PM Kusum Yojana: The Three-Component Structure

Component A: Decentralised Ground-Mounted Solar Plants

Component A enables farmers and rural landowners to set up small-scale solar power plants of 500 kW to 2 MW capacity on barren or uncultivable land. The generated power is sold to DISCOMs at a fixed tariff. For solar suppliers in this segment, the focus is on utility-grade, high-efficiency bifacial modules capable of sustained output over 25 years.

Component B: Standalone Solar Powered Agricultural Pumps

Component B replaces diesel-run water pumps with solar-powered pumps of up to 7.5 HP capacity. These are off-grid systems, requiring panels with consistent performance across varying irradiance levels. With over 17.5 lakh pumps targeted, this component alone is a massive market for panel distributors focused on rural and semi-urban geographies.

Component C: Grid-Connected Solar Powered Agriculture Pumps

Component C upgrades existing grid-connected agricultural pumps with solar energy, allowing farmers to consume solar power for irrigation and sell surplus power to the grid. Panels for this segment must be compatible with grid-tie systems and must comply with net-metering regulations set by state electricity regulatory commissions.

Technical Specifications Solar Panels Must Meet Under PM Kusum

Across all three components, MNRE’s technical specifications for solar panels under PM Kusum are stringent. Below are the key benchmarks installers and distributors must verify before procurement.

Module Type and Cell Technology

PM Kusum-approved installations predominantly use crystalline silicon modules — either Mono PERC or poly crystalline. However, given the efficiency advantages, Mono-PERC and M10 bifacial cells are increasingly preferred, especially for Component A solar plants where land-use efficiency is critical.

For a detailed comparison of cell technologies suitable for utility and agricultural solar applications, see our guide on understanding solar cell technologies including TOPCon, bifacial, half-cut, HJT, and Mono PERC.

Power Output and Efficiency

For Component A grid-scale applications, modules with a minimum power output of 375 Wp and efficiency exceeding 20% are standard. For Component B and C pump applications, panel specifications are matched to pump load requirements — typically 1 kW per HP of pump capacity, with a safety margin of 20% additional capacity factored in.

ALMM and BIS Certification

As with PM Surya Ghar, PM Kusum mandates the use of ALMM-listed modules. BIS certification under IS 14286 for crystalline silicon modules is mandatory. Any module failing to meet this standard is ineligible regardless of its price or efficiency claims.

Domestic Content Requirement (DCR) and Its Implications

A critical compliance requirement under PM Kusum’s Component A and B is the Domestic Content Requirement. Under DCR, both solar cells and modules must be manufactured in India. This has significant implications for the supply chain — distributors and installers cannot procure imported Chinese modules and remain compliant.

This is where partnering with a certified solar cell manufacturer in India becomes strategically essential. At Websol Energy System, we manufacture M10 Bifacial Mono-PERC solar cells at our plant in Falta, West Bengal — fully compliant with India’s DCR requirements.

Supply Chain Strategy for PM Kusum Installers

Winning PM Kusum tenders and delivering projects on time requires a robust, compliant supply chain. Here are the strategic priorities for solar distributors and installers:

Lock in manufacturer partnerships early: Government tendering timelines are unpredictable. Securing supply agreements with ALMM-listed, DCR-compliant manufacturers before bid submission prevents last-minute compliance failures.
Maintain documentation in advance: Keep updated copies of the manufacturer’s ALMM certificate, BIS certification, IEC test reports, and product datasheets ready for submission at bid and post-award stages.
Prioritise bifacial modules for Component A: In large ground-mounted projects, bifacial modules can increase yield by 10–15% depending on ground albedo — improving project IRR and making bids more competitive on per-unit generation costs.

Why Indian Solar Manufacturing Matters for PM Kusum Success

India’s solar manufacturing eco system has matured significantly, and working with established domestic manufacturers like Websol — among the earliest solar cell manufacturers in India since 1994 — gives installers access to consistent quality, reliable documentation, and local after-sales support. Explore the complete landscape of solar cell manufacturers in India at our guide to solar cell manufacturers in India.

Frequently Asked Questions

Q1: Is it mandatory to use Indian-made solar panels under PM Kusum?

Yes. Under the Domestic Content Requirement (DCR) applicable to PM Kusum Components A and B, both solar cells and modules must be manufactured in India. Imported modules are not eligible.

Q2: What is the minimum module efficiency required for PM Kusum Component A solar plants?

MNRE generally mandates a minimum module efficiency of 18.5% to 20% for PM Kusum ground-mounted plants. Using M10 Mono-PERC bifacial modules with efficiencies above 21% provides a compliance buffer and better project economics.

Q3: How are solar panels sized for PM Kusum Component B agricultural pumps?

The standard sizing formula is 1 kW of solar panel capacity per HP of pump capacity, plus a 20% safety margin. A 5 HP pump, for example, requires approximately 6–6.5 kW of solar panels.

Q4: What certifications must solar module manufacturers hold for PM Kusum supply?

Manufacturers must hold BIS certification under IS 14286, IEC 61215 and IEC 61730 certifications, and must appear on MNRE’s ALMM list. DCR-compliance documentation is additionally required.

Q5: Can bifacial modules be used for PM Kusum Component C installations?

Yes. Bifacial modules are increasingly used in Component C grid-connected agricultural pump installations as they offer higher yield per installed capacity — improving system ROI for farmers.

How to Qualify Solar Panels for PM Surya Ghar Muft Bijli Yojana: A Distributor’s Technical Guide

Websol Branding on April 4, 2026

How to Qualify Solar Panels for PM Surya Ghar Muft Bijli Yojana: A Distributor's Technical Guide

The Government of India’s PM Surya Ghar Muft Bijli Yojana has created one of the largest demand spikes in the residential solar market in recent history. With a target of electrifying 1 crore households with free solar power by 2027 and subsidies of up to ₹78,000 per household, solar distributors, sellers, and installers operating in this scheme are under immense pressure to source panels that meet strict technical and regulatory requirements.

This guide breaks down every critical technical criterion that solar panels must satisfy to be eligible under the scheme — and how to partner with the right solar cell and module manufacturer in India to stay consistently compliant.

Understanding PM Surya Ghar Muft Bijli Yojana at a Glance

Launched in February 2024, the PM Surya Ghar Muft Bijli Yojana is designed to enable Indian households to install rooftop solar systems of 1 kW to 3 kW capacity and above. The subsidy structure is as follows: ₹30,000 per kW for systems up to 2 kW, ₹18,000 per kW for the third kW, capping at ₹78,000 for 3 kW and above. Beneficiaries can apply through the National Portal for Rooftop Solar at pmsuryaghar.gov.in.

For installers and distributors, compliance with the Ministry of New and Renewable Energy (MNRE) norms — particularly the Approved List of Models and Manufacturers (ALMM) — is not optional. Panels sourced from non-ALMM manufacturers are ineligible for subsidy disbursement, making manufacturer selection a business-critical decision.

The ALMM Compliance Requirement: What Distributors Must Know

The Approved List of Models and Manufacturers (ALMM) is maintained by MNRE and lists solar PV modules certified for use in government-funded solar projects including PM Surya Ghar. To appear on this list, a manufacturer must pass Bureau of Indian Standards (BIS) certification and meet performance benchmarks under IEC 61215 and IEC 61730 standards.

Distributors and installers must always verify that the solar panels they procure appear on the current ALMM list, available at mnre.gov.in. The list is updated quarterly, and any module delisted between order and installation can jeopardise subsidy disbursement.

Key Technical Benchmarks for Panel Eligibility

1. Module Efficiency Standards

MNRE mandates minimum module efficiency levels for subsidised installations. For crystalline silicon (c-Si) modules — which form the backbone of most residential solar installations — the minimum efficiency threshold is typically 19.5% and above for Mono PERC and higher-tier technologies. As a distributor, sourcing panels from a manufacturer using M10 wafer-based Mono-PERC or bifacial cells ensures you are well above the minimum bar.

Understanding the technical differences between cell technologies helps you make informed procurement decisions. Explore our detailed breakdown of MonoPERC, N-Type, and M10 cell technologies at our MonoPERC vs N-Type vs M10 guide to choose the right technology for residential rooftop applications.

2. Temperature Coefficient and Performance in Indian Climates

India’s diverse climate — from humid coastal belts to scorching plains — demands panels with a low temperature coefficient of power (Pmax). A coefficient better than -0.35%/°C is preferred. M10 Mono-PERC bifacial cells perform exceptionally well in high-irradiance, high-temperature conditions typical across India’s solar belt, offering consistent output even as ambient temperatures exceed 40°C.

3. Durability and Warranty Requirements

MNRE-backed scheme installations require modules with at least a 25-year linear power output warranty and a minimum 10-year product warranty. Installers should request manufacturer warranty certificates during procurement and maintain these for audit purposes, as DISCOMs may verify these documents during subsidy processing.

Choosing the Right Manufacturer: Compliance + Capacity

Sourcing panels from a verified domestic solar cell and module manufacturer in India not only ensures ALMM compliance but also supports the government’s Atmanirbhar Bharat manufacturing push. Under the Domestic Content Requirement (DCR) provisions in certain government tenders, domestically manufactured modules are mandatory.

At Websol Energy System, as a leading solar cell manufacturer in India, we manufacture M10 Bifacial Mono-PERC solar cells certified to international quality standards — a technology ideal for the residential and small commercial segments targeted under PM Surya Ghar.

Our solar module manufacturer in India capabilities ensure end-to-end traceability from cell to finished module, with documentation ready for ALMM audit requirements.

Installation Best Practices for Subsidy Disbursement

Even compliant panels can result in subsidy delays if installation standards are not followed. MNRE requires that all PM Surya Ghar installations are connected to the grid through a net-metering arrangement with the local DISCOM. Installers must use approved grid-tie inverters, properly size the system based on the sanctioned load, and submit all documents — including module specifications, ALMM certificates, and installation photographs — through the national portal.

Frequently Asked Questions

Q1: What is ALMM and why is it mandatory for PM Surya Ghar installers?

ALMM (Approved List of Models and Manufacturers) is MNRE's list of certified solar modules eligible for use in government-funded schemes. Any module not on the ALMM list will make the installation ineligible for PM Surya Ghar subsidies, regardless of its technical quality.

Q2: Which solar cell technology is best suited for PM Surya Ghar residential installations?

Mono PERC and M10 bifacial Mono-PERC cells are the most suitable for residential rooftops due to their high efficiency (19.5%–22%), compact footprint, and strong performance in high-temperature Indian climates.

Q3: Can installers use imported solar panels for PM Surya Ghar installations?

No. PM Surya Ghar mandates the use of ALMM-listed modules, and many government tenders under the scheme enforce DCR (Domestic Content Requirement), effectively requiring modules manufactured in India.

Q4: How often is the ALMM list updated by MNRE?

The ALMM list is updated periodically — typically quarterly — by MNRE. Installers and distributors must check the current list at mnre.gov.in before procuring panels for any government-linked project.

Q5: What documents do distributors need from manufacturers for ALMM compliance?

Distributors should collect BIS certification certificates, IEC 61215 and IEC 61730 test reports, module datasheet with efficiency and warranty details, and the ALMM registration number of the manufacturer.

Q6: Does Websol Energy System's solar module qualify for PM Surya Ghar scheme installations?

Websol Energy System manufactures M10 Bifacial Mono-PERC cells and modules that meet the technical specifications required under MNRE guidelines. Installers and distributors are encouraged to contact Websol directly for current ALMM status and product documentation.

Why India’s Solar Module Manufacturing Sector Is Gaining Global Attention

Websol Branding on March 28, 2026

Why India's Solar Module Manufacturing Sector Is Gaining Global Attention

The geography of global solar module manufacturing has been remarkably stable for the better part of two decades. China built dominant scale in wafer, cell, and module production through coordinated industrial policy, cheap capital, and a domestic market large enough to justify continuous capacity expansion. The result was a supply chain structure that gave Chinese manufacturers structural cost advantages that were, for most of that period, insurmountable by manufacturers elsewhere.

That picture is changing. A combination of geopolitical risk reassessment, domestic policy support, and genuine manufacturing capability development has positioned India as the most credible alternative PV manufacturing geography outside of China. This is attracting attention from global buyers, project developers, and institutional investors who had previously not engaged seriously with Indian module supply.

Policy Architecture: The Foundation for Manufacturing Scale

India’s solar manufacturing growth is not organic — it has been deliberately engineered through complementary policy instruments. The Production Linked Incentive (PLI) scheme for high-efficiency solar modules, with its initial outlay of approximately ₹4,500 crore and subsequent expansion, has incentivized manufacturers to invest in new cell and module capacity with a focus on high-efficiency technologies.

Simultaneously, the Basic Customs Duty (BCD) of 25% on solar modules and 40% on solar cells (effective April 2022) created a structural cost differential that made domestically produced modules more competitive within the Indian market. The ALMM (Approved List of Models and Manufacturers) requirement for government-tendered projects created a captive demand channel for domestic manufacturers.

These instruments work together: BCD creates domestic demand, PLI funds capacity and quality upgrades, and ALMM ensures that new capacity finds buyers. For manufacturers, the combination has underwritten investment decisions that would have been difficult to justify on market economics alone.

Manufacturing Capability: Beyond Assembly

A significant portion of India’s historical solar ‘manufacturing’ was more accurately described as module assembly — importing Chinese cells and laminating them into modules with Indian frames and junction boxes. This has changed materially. Investment in upstream cell manufacturing capacity means that Indian PV module manufacturers are increasingly offering genuine domestic content, with cells produced on Indian soil.

Manufacturers like Websol Energy System represent the upstream end of this shift — producing solar cells domestically that feed Indian module production lines. This vertical integration, even if not yet complete across the full supply chain (wafer and polysilicon production in India remain limited), substantially increases the domestic value addition in Indian-made modules.

For buyers concerned about supply chain provenance — whether for sustainability reporting, financing requirements, or geopolitical risk management — the ability to trace a module’s cells to an Indian manufacturer matters. It is a diff;erent proposition from a module assembled in India on imported Chinese cells.

Technology Trajectory: Closing the Efficiency Gap

One of the historical criticisms of Indian solar manufacturing was an efficiency gap relative to Chinese producers. This gap has narrowed meaningfully. Indian MonoPERC cell producers are now achieving commercial efficiencies consistent with global peers, and several manufacturers have announced or commenced TOPCon production lines. The efficiency gap that once justified premium pricing for imported cells has shrunk to a range where landed cost, domestic content requirements, and supply chain reliability arguments can tip procurement decisions toward Indian suppliers.

R&D Investment and Technology Partnerships

Several Indian manufacturers have entered technology partnerships with Taiwanese, European, and South Korean equipment and process technology suppliers to accelerate their capability development. These partnerships transfer not just equipment but process knowledge — a critical ingredient in achieving consistent high-efficiency production rather than peak efficiency in controlled conditions.

International Market Access: The Export Dimension

India’s solar module manufacturing ambitions extend beyond the domestic market. With the US Inflation Reduction Act and European supply chain due diligence regulations creating demand for non-Chinese solar supply, Indian manufacturers are positioned as credible alternative suppliers for the first time.

The US market, in particular, has shown appetite for Indian modules. The combination of the IRA’s domestic content and energy community bonus credits, and the ongoing investigation into Southeast Asian transshipment of Chinese cells, has opened a window for Indian producers. Several large Indian manufacturers have announced or are pursuing export commitments to US and European markets, a development that would have been commercially marginal as recently as 2021.

Challenges That Remain

Acknowledging the genuine growth in Indian solar module manufacturing requires equal clarity about the challenges that persist. Polysilicon and silicon wafer production in India is nascent — the upstream supply chain remains significantly import-dependent. Silver paste, a high-value cell production input, is predominantly imported. Logistics costs and infrastructure gaps in some manufacturing clusters add to production cost structures that are not yet at Chinese cost parity.

Quality consistency across the industry also varies. The Indian solar cell manufacturing sector includes manufacturers with world-class process controls alongside smaller operations with less rigorous quality systems. Buyers need to conduct genuine due diligence rather than assuming that ‘Made in India’ is a uniform quality signal.

Conclusion

India’s solar manufacturing sector is attracting global attention for substantive reasons — policy support, genuine capability development, geopolitical tailwinds, and a domestic market large enough to underwrite continued investment. The question is no longer whether Indian solar module manufacturing is serious, but how quickly it can close the remaining cost and quality gaps to become a genuinely competitive global supply source. For buyers building procurement strategies today, building relationships with capable Indian manufacturers now positions them well for a supply chain landscape that will look materially different by 2027.

Frequently Asked Questions

Why is India becoming important in solar manufacturing?

India is expanding solar manufacturing through government policies such as PLI schemes, ALMM regulations, and import duties, encouraging domestic production.

What is the Production Linked Incentive (PLI) scheme?

The PLI scheme is a government initiative that supports solar manufacturers by providing financial incentives for producing high-efficiency solar modules in India.

How does ALMM affect solar manufacturing?

ALMM requires solar projects under government tenders to use modules from approved manufacturers, strengthening domestic solar production.

Are Indian solar modules exported internationally?

Yes. Indian manufacturers are increasingly supplying solar modules to global markets including the United States, Europe, and Southeast Asia.

What challenges does India’s solar manufacturing industry face?

Challenges include dependence on imported wafers and polysilicon, supply chain costs, and competition with large global manufacturers.

What is solar module manufacturing?

Solar module manufacturing involves assembling photovoltaic cells into panels that can generate electricity when exposed to sunlight.

What is the difference between solar cells and solar modules?

Solar cells generate electricity individually, while solar modules connect multiple cells together to form complete solar panels.