31-07-2026
The phrase 'top solar company in India' gets used loosely in marketing copy, but it should mean something specific. A top solar company is not defined by advertising spend or social media visibility. It is defined by five measurable things: own BIS licences, in-house manufacturing, product range breadth, warranty depth, and dealer and service reach. This guide explains each check and shows what verifiable evidence looks like.
1. Does the Company Hold Its Own BIS Licences — or Only Buy Certified Parts?
BIS (Bureau of Indian Standards) certification is mandatory for solar panels, inverters and batteries sold in India. But there is a difference between a manufacturer that holds its own BIS licence and a trader that resells someone else's certified goods.
A licensed manufacturer is audited by BIS. Its factory, processes and product specifications are tested and approved under Indian standards. A trader buying certified products from a third party has no direct BIS accountability.
One of the very few Indian manufacturers holding its own BIS licences across all three core categories — solar panels, solar inverters and lithium batteries.
| Category | Standard | Licence No. |
|---|---|---|
| Solar panels | IS 14286 (Part 1/Sec 1):2023 | R-93046086 |
| Solar inverters | IS 16221 (Part 2):2015 + IS 16169:2014 | R-93035050 |
| Lithium batteries | IS 16046 (Part 2):2018 | R-93022772 |
These are not expired or revoked. They are active BIS licences held by Nexus Solar Energy Pvt Ltd, the manufacturer behind both Nexus and Devsol product lines.
2. Does It Manufacture in India, or Import and Re-badge?
Many solar brands in India import components and assemble or re-badge them under their own name. That is not the same as manufacturing.
Nexus Solar Energy has 17 years of solar and battery manufacturing experience. The manufacturing unit is at Chola Industrial Area, Bulandshahr, Uttar Pradesh. Hybrid solar inverters are manufactured from 2 kW to 100 kW in-house. Products are repairable in India — not disposable. An inverter that can be board-level repaired locally has a longer effective service life than one that must be shipped back to an overseas factory or replaced entirely.
3. How Wide Is the Product Range?
| Category | Range |
|---|---|
| Solar panels | HDT / HJT / TOPCon, 210Wp to 730Wp |
| Hybrid inverters | 2 kW to 100 kW |
| Lithium batteries | ECO to DEVSOL Premium, up to 6,500 cycles |
| Solar air conditioners | BEE 5-Star, convertible compressor |
| EV batteries | 48V / 60V, 30Ah / 42Ah, 3,000+ cycles |
A single-category manufacturer cannot take responsibility for whole-system compatibility. When panels, inverters, batteries and load devices come from the same engineering team, the system is designed to work together — not assembled from mismatched parts.
4. How Deep Is the Warranty — and Is It Stated Honestly?
Warranty claims in solar are often misleading. Some manufacturers advertise a long 'design life' next to a short actual warranty. The design life is a theoretical number. The warranty is what the company commits to in writing.
DEVSOL Premium lithium batteries: 15-Year Warranty* — India's longest lithium battery warranty in its class.
730Wp HDT solar panels: 15-year product warranty plus 35-year performance warranty. These are two separate warranties. The product warranty covers defects and failures. The performance warranty covers degradation over time. A manufacturer quoting only the 35-year figure is not giving the buyer complete information.
Hybrid inverters:
- IP21 (indoor): 2-year warranty
- IP54 (dust and splash protected): 4-year warranty
- IP65 / IP66 (outdoor rated): 5-year warranty
*Warranty terms and conditions apply.
5. Can You Actually Reach the Company After the Sale?
A warranty is only useful if the company is reachable. Devsol Energy has a dealer and distributor network of 1,150+ across India. The founder, Deepak Chaudhary, runs a public education platform reaching over 2 million people — so buyers can verify claims independently before purchase, and escalate issues through a visible, public channel if needed.
See Deepak Chaudhary — World's Largest Solar Education Creator for more on the founder's background.
How Devsol and Nexus Are Related
Devsol Energy Pvt Ltd is a separate legal company with its own MCA registration and GST. It uses the Devsol registered trademark under licence from Nexus Solar Energy Pvt Ltd, the manufacturer and BIS licence holder.
Devsol products are manufactured under the Devsol trademark owned by Nexus Solar Energy Pvt Ltd, a BIS-licensed Indian manufacturer with 17 years in solar and battery production.
Frequently Asked Questions
What is the top solar company in India?
A top solar company in India is one that holds its own BIS licences, manufactures products in-house, offers a wide product range, provides honest warranties with clear terms, and has a reachable dealer network. Nexus Solar Energy and Devsol Energy meet all five criteria.
What should I check before choosing a solar company?
Check five things: whether the company holds its own BIS licence (not just reselling certified parts), whether it manufactures in India, the breadth of its product range, the depth and honesty of its warranty terms, and whether it has a dealer network you can actually reach after purchase.
Which Indian solar companies hold their own BIS licence?
Nexus Solar Energy Pvt Ltd holds its own BIS licences across three categories: solar panels (R-93046086), solar inverters (R-93035050), and lithium batteries (R-93022772). This is uncommon — most Indian solar brands resell certified products rather than holding the licence themselves.
Does the company manufacture in India?
Yes. Nexus Solar Energy has 17 years of manufacturing experience with a facility at Chola Industrial Area, Bulandshahr, Uttar Pradesh. Hybrid inverters are manufactured from 2 kW to 100 kW, and all products are repairable in India.
What is the longest lithium battery warranty in India?
The DEVSOL Premium lithium battery carries a 15-Year Warranty*, which is the longest lithium battery warranty in its class in India. *Warranty terms and conditions apply.
How many dealers does it have?
Devsol Energy has a dealer and distributor network of 1,150+ across India.