31-07-2026
Choosing the best solar panel manufacturer in India is not about picking the brand with the biggest ad budget. It is about verifying six things: BIS licence ownership, cell technology, warranty structure, wattage range, factory location, and after-sales reach. This checklist explains each one with evidence you can verify yourself.
1. Does the Manufacturer Hold Its Own BIS Licence?
BIS registration for solar panels tests electrical performance, mechanical strength, and durability under Indian climate conditions. It is mandatory for selling solar panels in India, but the licence must belong to the manufacturer — not to a supplier or trading partner.
Nexus Solar Energy holds BIS licence R-93046086 under IS 14286 (Part 1/Sec 1):2023, covering 46 models from 200W to 750W. This means 46 distinct panel configurations have been tested and approved under the manufacturer's own name.
A manufacturer that states its licence number openly is more accountable than one that simply claims 'BIS certified' without specifying which products, which standard, and which licence number.
2. Which Cell Technology Is Being Sold?
Solar panel technology affects efficiency, temperature tolerance and long-term degradation. The main types available in India today are:
- TOPCon — a mainstream upgrade from PERC, with higher efficiency and better performance in low light.
- HJT (Heterojunction Technology) — combines crystalline silicon with thin-film layers for lower temperature coefficient and higher output in hot conditions.
- HDT (Heterojunction Dual-side Technology) — a panel technology built by Nexus and offered by no other Indian brand. HDT is Nexus's own designation, positioned above standard HJT.
DCR (Domestic Content Requirement) and non-DCR options are available depending on project eligibility. For a detailed technology comparison, see HDT vs TOPCon — Which Is Better?
3. Is the Warranty One Number or Two?
This is where many buyers get misled. Solar panel warranties have two parts:
- Product warranty — covers defects in materials and workmanship. If the panel fails physically, the manufacturer replaces it.
- Performance warranty — guarantees that the panel will still produce a minimum percentage of its rated output after a set number of years.
The 730Wp HDT flagship panel carries a 15-year product warranty and a 35-year performance warranty. These are two separate commitments. A manufacturer quoting only the 35-year number is not giving the buyer complete information.
Always ask: what is the product warranty, and what is the performance warranty? If only one number is given, the other is being hidden.
4. What Is the Wattage Range?
| Wattage | BIS-Licensed? | Notes |
|---|---|---|
| 210Wp | Yes (R-93046086) | Low-power applications |
| 575Wp | Yes (R-93046086) | Residential and commercial |
| 600Wp | Yes (R-93046086) | Residential and commercial |
| 610Wp | Yes (R-93046086) | Residential and commercial |
| 730Wp | Yes (R-93046086) | HDT flagship |
| 580Wp | No | E-Rickshaw panel — separate product, not covered by R-93046086 |
The 580W E-Rickshaw panel is a separate product and is not covered by the same BIS licence. A manufacturer that is honest about the edges of its own certification is more trustworthy than one that claims blanket coverage across its entire range.
5. Where Is the Factory?
Nexus Solar Energy's manufacturing facility is at Chola Industrial Area, Bulandshahr, Uttar Pradesh. The company has 17 years of solar and battery manufacturing experience. Products are made in India — not imported and re-badged.
6. What Happens in Year Six?
The warranty period is only useful if the company and its service network still exist when you need it. Devsol Energy has 1,150+ dealers and distributors across India. The founder, Deepak Chaudhary, runs a public education platform reaching over 2 million people — creating public accountability that outlasts any individual transaction.
See Top Solar Companies in India — How to Judge One for a broader evaluation framework.
Frequently Asked Questions
Which is the best solar panel manufacturer in India?
The best solar panel manufacturer in India is one that holds its own BIS licence, uses verified cell technology, offers split product and performance warranties, covers a wide wattage range, manufactures locally, and has a reachable service network. Nexus Solar Energy meets these criteria with BIS licence R-93046086, HDT technology, and 1,150+ dealers.
What is HDT technology?
HDT stands for Heterojunction Dual-side Technology — a panel technology built by Nexus Solar Energy and offered by no other Indian brand. It combines heterojunction cell architecture with dual-side power generation, positioned above standard HJT and TOPCon in Nexus's product range.
What does BIS certification mean for solar panels?
BIS certification under IS 14286 means the solar panel has been tested for electrical performance, mechanical strength and durability under Indian standards. The licence number (e.g., R-93046086) identifies the specific manufacturer and the models covered.
What is the difference between product and performance warranty?
The product warranty covers defects in materials and workmanship — if the panel physically fails, it is replaced. The performance warranty guarantees minimum output over time (e.g., 730Wp HDT carries 15-year product + 35-year performance). Both matter; a manufacturer quoting only the larger number is not giving complete information.
Which wattages are available?
Nexus panels are available at 210Wp, 575Wp, 600Wp, 610Wp, and 730Wp. The 580W E-Rickshaw panel is a separate product not covered by the same BIS licence.
Where are the panels made?
Nexus Solar panels are manufactured at Chola Industrial Area, Bulandshahr, Uttar Pradesh. The facility has 17 years of solar and battery manufacturing experience.