Types of Solar Panels Available in India

Walk into any solar distributor in Surat or Pune today and you'll see at least four panel technologies on offer, Mono PERC, TOPCon, bifacial, and the odd batch of poly modules still clearing inventory. Each technology has a different efficiency range, price point, degradation rate, and fit for different roof types, customer budgets, and DISCOM (Distribution Company) net metering contexts.

The problem for most EPCs and installers: they quote whatever their distributor pushes, without a decision framework. That leaves money on the table, either over-quoting poly on a budget-conscious lead or under-quoting PERC where a customer would have paid for TOPCon and a 5-year better payback.

This guide gives you The Panel Technology Selection Matrix, a structured way to decide which panel type fits which customer scenario, every time.

Reader lens: This post is primarily for ICP #1 Rohit (scaling EPC owner who needs a team-wide framework) and ICP #2 Imran (solo installer who needs to know what to quote in a 10-minute site visit).

What the ALMM List Means for Your Panel Choices

Before we get into technology types, one constraint frames everything: the ALMM (Approved List of Models and Manufacturers) maintained by the Ministry of New and Renewable Energy (MNRE).

PM Surya Ghar Muft Bijli Yojana, the government scheme that drives a large chunk of residential solar demand today, requires that all panels used in eligible installations come from the ALMM list. This is not optional. Quoting a non-ALMM panel to a customer who wants the subsidy means they won't get it.

The ALMM list includes panels from Indian manufacturers like Waaree Energies, Adani Solar, Vikram Solar, Goldi Solar, and RenewSys, plus select imported modules that have cleared the quality certification process. Updated quarterly, the list is the baseline requirement for all government-scheme jobs.

For your own reference, India solar panel price trends gives a live pricing view that pairs with this technology guide.

Monocrystalline PERC, The Current Workhorse

Mono PERC (Passivated Emitter and Rear Cell) is the technology that built India's modern residential solar market. It replaced poly as the default choice for 1–10 kW residential systems around 2019–2021, and in 2026 it still holds the majority of volume in the sub-₹5 lakh residential segment.

How it works: A single silicon crystal structure (monocrystalline) with a passivation layer on the rear cell that reflects unused light back through the cell, increasing absorption. The result is higher efficiency from the same panel area compared to poly.

Typical specs in India (2026):

• Efficiency: 19.5–21.5%
• Watt range: 380–440 Wp (most common: 400–420 Wp)
• Temperature coefficient: -0.35% to -0.38%/°C
• Degradation: 0.45–0.55%/year after year 1
• Price range: ₹18–22/Wp (ex-factory, ALMM brands)

Best for: Standard residential roofs (80–200 sq ft available), PM Surya Ghar 1–5 kW systems, price-sensitive customers, tier-2 and tier-3 city markets.

A 3 kW system with 400 Wp PERC panels needs 7–8 panels, fits in roughly 180–200 sq ft of roof space, and costs ₹1.6–2.2 lakh before PM Surya Ghar subsidy. After the ₹78,000 subsidy, net consumer outlay: ₹82,000–1.42 lakh. This math is what closes most residential deals in Aurangabad, Nagpur, Jaipur, and similar markets.

Mono TOPCon, The New Standard for Premium Systems

TOPCon (Tunnel Oxide Passivated Contact) is the technology that is rapidly replacing PERC as the default for systems above ₹2.5 lakh or for customers who want maximum generation from limited roof space.

How it works: Adds a ultra-thin tunnel oxide layer and a polysilicon layer on the rear of the cell, reducing electron recombination significantly. Result: higher open-circuit voltage, better low-light performance, lower temperature coefficient.

Typical specs in India (2026):

• Efficiency: 22–24%
• Watt range: 420–580 Wp (most common: 450–540 Wp)
• Temperature coefficient: -0.28% to -0.32%/°C
• Degradation: 0.35–0.45%/year
• Price range: ₹22–27/Wp

TOPCon's key advantage in India's climate: better temperature coefficient means less generation loss on hot summer days. In cities like Ahmedabad, Jaipur, and Hyderabad where ambient temperatures reach 40–48°C in May–June, a PERC panel operating at 65°C loses roughly 8.4% output. A TOPCon panel at the same temperature loses 5.6%. Over a 25-year system lifetime, this adds up to 50,000+ extra units of generation per kW installed.

Best for: Customers with limited roof space who need maximum kWh output, high-value residential (above ₹2 lakh systems), commercial installations, PM Surya Ghar 3 kW systems where you want to distinguish your quote from competitors.

HJT Panels, Maximum Efficiency, Premium Price

HJT (Heterojunction Technology) combines amorphous silicon layers with crystalline silicon, delivering the highest efficiency available in commercial panels today. In India, HJT is still a niche product, priced 30–60% above PERC, but it's gaining traction in premium residential and C&I segments.

Typical specs in India (2026):

• Efficiency: 23–25%
• Watt range: 430–600 Wp
• Temperature coefficient: -0.24 to -0.26%/°C (best among all technologies)
• Price range: ₹28–38/Wp
• Available from: RenewSys (India), select imported brands on ALMM

HJT's strongest argument in India's context: the temperature coefficient. At 45°C ambient (Rajasthan summer), an HJT panel operates at approximately 70°C. At -0.25%/°C temperature coefficient, it loses 6.25% output vs STC. A PERC at the same conditions loses 10.5%. Over a 1 MW commercial array in Jodhpur, that difference is measurable in lakhs of rupees of annual generation value.

Best for: High-ambient-temperature states (Gujarat, Rajasthan, MP, Telangana), premium residential customers who want the best technology, commercial installations above 50 kW where generation maximization justifies the premium.

Bifacial Panels, Commercial Roofs and Ground Mounts

Bifacial panels generate electricity from both sides, front from direct irradiance, rear from reflected light (albedo). The rear-side gain (bifaciality gain) ranges from 5% to 15% depending on the surface below and mounting height.

Where bifacial works in India:

• Flat concrete commercial roofs with light-colored surface: 8–12% rear gain
• Elevated mounting (600+ mm above white roof): 10–15% gain
• Ground mounts on sandy/white soil: 5–8% gain
• Sloped residential tile roofs: 1–3% gain (minimal benefit, don't upsell here)

Bifacial panels come in both PERC and TOPCon cell types. Most bifacial modules in India today are TOPCon bifacial, getting both the bifaciality gain AND the lower temperature coefficient advantage.

IEEFA (Institute for Energy Economics and Financial Analysis) has documented that bifacial TOPCon modules in Indian C&I installations showed 10–14% higher annual generation versus standard monofacial PERC in flat-roof configurations, making them the preferred spec for commercial projects above 20 kW.

Polycrystalline Panels, Why You Should Mostly Avoid Them Now

Poly (polycrystalline BSF) panels were the default until 2018–2019. You'll still find them in distributor stock, sometimes at attractive prices (₹14–17/Wp). Here's why you should be cautious.

The real problem with quoting poly for a premium customer: 25-year degradation. Poly degrades at 0.6–0.8%/year vs PERC at 0.45–0.55%/year. Over 25 years, a 400 Wp poly panel is producing 85–88% of its rated output. A PERC panel of the same wattage is producing 87–89%. The difference in year-25 generation on a 3 kW system: 200–500 kWh/year, which at ₹8/unit is ₹1,600–4,000/year less generation value. Multiply over 25 years and the poly "savings" disappear.

The Panel Technology Selection Matrix

This is the proprietary framework this guide introduces. Map your customer to one of four scenarios and the technology choice follows:

1. A

   Scenario A, Budget Residential + PM Surya Ghar → Mono PERC

   Customer wants maximum subsidy benefit at lowest cost. 1–3 kW. Roof space adequate. Tier-2/3 city. Quote: ALMM-listed Mono PERC 400–420 Wp at ₹18–21/Wp. System cost before subsidy: ₹55,000–1,05,000/kW installed. After ₹78,000 max subsidy: excellent ROI.

2. B

   Scenario B, Premium Residential + Limited Roof → TOPCon

   Customer has limited roof space (under 100 sq ft per kW), or wants maximum generation, or is in a high-ambient-temperature city. Quote: TOPCon 450–540 Wp at ₹22–27/Wp. Higher upfront but more generation per sq ft over 25 years.

3. C

   Scenario C, Commercial / Industrial Flat Roof → Bifacial TOPCon

   System above 20 kW on flat concrete commercial roof. Painting roof white adds 8–12% bifacial gain for low cost. Quote: bifacial TOPCon at ₹24–30/Wp. Best generation economics for commercial clients measuring IRR/payback.

4. D

   Scenario D, Agricultural / Pump / Off-grid → PERC or PERC (poly only if ALMM and space available)

   Water pump, agriculture feeder, or off-grid load. No net metering involved. Space is available. If cost is the priority, ALMM-listed poly works. If efficiency matters, PERC is better. Avoid TOPCon/HJT unless customer specifically pays premium.

ALMM List and DCR, What EPCs Need to Know

The ALMM list is the panel sourcing gate. But there's a related term that causes confusion: DCR (Domestic Content Requirement).

DCR panels are panels made from solar cells manufactured in India (not just assembled in India). Government-funded projects under PM Surya Ghar and other MNRE schemes often have a DCR preference, meaning panels made from Indian cells get preference in vendor selection.

MNRE updates the ALMM list quarterly. Bookmark it. When you're sourcing new stock, always cross-check the panel model against the current ALMM list before committing to a purchase order.

For a full cost breakdown by system size, see solar installation cost breakdown India and 5 kW solar system price guide.

Net Metering Impact on Panel Choice

Panel technology choice connects to net metering outcomes. Here's why: higher-efficiency panels generate more energy per sq ft, which affects the export-to-import ratio in net metering calculations.

A 3 kW system with PERC panels on a Pune roof generates approximately 3,600–4,000 kWh/year. The same system with TOPCon panels generates 4,200–4,600 kWh/year, 10–15% more. In a net metering arrangement with MSEDCL at ₹8.50/unit import rate, that extra generation is worth ₹5,100–8,500/year in avoided cost or export credit.

Understanding net metering is essential for presenting this math to customers accurately. The net metering Hindi guide covers the DISCOM approval process and bill calculation. For the English explainer, see what is net metering and the net metering application guide.

How QuickEstimate Helps You Quote the Right Panel

Quoting the wrong panel technology doesn't just cost your customer, it costs you. If a competitor quotes TOPCon at 10% more than your PERC quote and explains the generation benefit clearly, the customer will choose them. If you quote TOPCon at a premium without a clear ROI story, you'll lose on price.

The tool that solves this is a proposal generator that shows the math in a clear, one-page format, system size, technology, generation estimate, subsidy, net cost, payback, monthly savings.

• Proposal Generator, Enter system size and panel technology, 60-second branded PDF with PM Surya Ghar subsidy pre-filled. Customer sees the number, not the jargon.
• Quotation System, Generate detailed cost breakdowns by panel type, inverter, and mounting, easy to compare PERC vs TOPCon options for the same customer.
• Pipeline Management, Track which panel technology your team is quoting and which is converting, data for your next procurement decision.

Free plan: 10 proposals/month. No card. Start at quickestimate.co. For a comparison of free solar tools, see free solar software comparison guide.

What to Do Before Your Next Quote

Three practical actions from this guide:

1. Check your current stock against the ALMM list: Pull up MNRE ALMM portal, search your panel brand and model, and confirm all your current PERC and TOPCon stock is listed. If anything isn't, don't use it for PM Surya Ghar jobs.

2. Add TOPCon to your next 3 customer quotes as an upgrade option: Quote PERC as the base spec and TOPCon as a premium option with the generation math shown. Track how many customers choose the upgrade. If conversion rate on TOPCon is above 20%, start stocking more.

3. Map your customer base to the Selection Matrix: Review your last 10 closed deals. For each, note roof type (flat/sloped), system size, and which technology you quoted. Match to the 4 scenarios. If there's a mismatch, you have an upsell or correction opportunity in your next similar quote.

Frequently Asked Questions

Which solar panel technology is best for residential use in India in 2026?

Mono PERC is the best value choice for most residential customers in 2026, it covers the 380–440 Wp range at ₹18–22/Wp and all major ALMM-listed Indian brands offer it. For customers with limited roof space or in high-temperature states like Gujarat, Rajasthan, or Telangana, TOPCon (₹22–27/Wp) offers 10–15% more generation per sq ft with a lower temperature coefficient, making it worth the premium for systems above ₹2 lakh.

Are poly solar panels still available in India?

Yes, polycrystalline BSF panels are still available in India, mainly as clearing stock from distributors. Some ALMM-listed poly panels exist. However, with Mono PERC prices having dropped to ₹18–22/Wp, poly's price advantage has narrowed significantly. The lower efficiency and higher degradation of poly makes it a poor choice for PM Surya Ghar jobs or any space-constrained roof. Only consider poly for off-grid/pump applications with ample space.

What is the ALMM list and do all solar panels need to be on it?

The ALMM (Approved List of Models and Manufacturers) is maintained by MNRE and lists quality-verified solar panel models eligible for use in government-scheme projects. All panels used in PM Surya Ghar Muft Bijli Yojana installations must be ALMM-listed, this is mandatory for subsidy eligibility. For non-government projects (purely private), ALMM is not legally required, but it remains a good quality benchmark.

What is the difference between TOPCon and HJT solar panels?

Both are high-efficiency technologies above 22%. TOPCon (Tunnel Oxide Passivated Contact) adds a tunnel oxide and polysilicon rear layer to a crystalline silicon cell. HJT (Heterojunction Technology) sandwiches crystalline silicon between amorphous silicon layers. HJT has a slightly better temperature coefficient (-0.24 to -0.26%/°C vs -0.28 to -0.32%/°C for TOPCon) but costs 30–50% more than TOPCon in India. HJT makes sense for extreme heat locations; TOPCon is the practical premium choice for most projects.

When should I quote bifacial panels to a customer?

Quote bifacial when: (1) the installation is on a flat concrete commercial roof where rear-side albedo gain is possible, (2) the roof can be painted white or is already light-colored, and (3) the mounting system allows at least 400–600 mm clearance above the roof surface. On sloped residential tile roofs, bifacial gain is minimal (1–3%), the premium isn't justified. For commercial systems above 20 kW, bifacial TOPCon typically delivers the best generation economics.

How does panel technology affect the PM Surya Ghar subsidy amount?

The PM Surya Ghar subsidy amount is fixed by system size, not by panel technology: ₹30,000/kW for the first 2 kW (max ₹60,000), and ₹18,000 for the 3rd kW (max ₹78,000 total). Technology doesn't change the subsidy amount, but it does change the total system cost, so the net consumer outlay after subsidy varies. Higher-efficiency TOPCon panels in the same roof area can deliver a 3 kW system where PERC might only fit 2.5 kW, and the third kW earns an extra ₹18,000 in subsidy.

What watt range of solar panels is most common in India?

For residential (1–5 kW systems): 380–440 Wp PERC panels are most common. For commercial (10–100 kW): 450–550 Wp TOPCon or bifacial panels are increasingly standard. The trend is toward higher wattage per panel, fewer panels needed for the same kW, reducing mounting hardware cost and labor time. 540 Wp TOPCon panels, which were uncommon in India before 2023, are now widely stocked by major distributors like Waaree and Adani Solar.