Part of the complete guide: Solar cost (complete guide)
A 3 kW rooftop system in Kollam costs about ₹1.7–2.1 lakh before subsidy. Central subsidy is up to ₹78,000, so most homes pay about ₹0.9–1.3 lakh and recover it in 3.5 to 5 years.
Cost, subsidy and savings by system size
| System | Indicative cost | Subsidy | Yearly generation | Yearly bill saving |
|---|---|---|---|---|
| 2 kW | ₹1.2–1.4 lakh | ₹60,000 | 2,920 units | ₹20,440 |
| 3 kW | ₹1.7–2.1 lakh | ₹78,000 | 4,380 units | ₹30,660 |
| 5 kW | ₹2.8–3.4 lakh | ₹78,000 | 7,300 units | ₹51,100 |
| 10 kW | ₹5.3–6.2 lakh | ₹78,000 | 14,600 units | ₹102,200 |
Indicative: complete DCR on-grid system, ₹7 per unit. Actual prices depend on brand, roof and structure.
Why Kollam is different
Kollam combines dense urban housing, backwater and coastal homes, cashew and ceramics units and a long rubber belt in the east. Bills are rising, and sunshine is consistent, so rooftop solar is among the better home investments in the district.
Subsidy in Kollam
Homes can claim the central PM Surya Ghar subsidy of up to ₹78,000. Check ANERT and KSEB for any additional state-level support.
Metering and billing in Kollam
KSEB supports rooftop solar through net metering for small systems and net billing for larger ones, according to KSERC's 2025 regulations as reported (billing changes from 2026). Systems up to about 3 kW (5 kW with a battery) are net-metered with full credit for exports; larger systems are net-billed, with exports settled at a low rate. Size to your daytime use and confirm current limits with your KSEB section office.
Towns covered
We cover Kollam city, Karunagappally, Kottarakkara, Punalur, Paravur, Kundara and Anchal and many more. See the Kollam solar guide for every town.
More for Kollam
- Solar cost and subsidy in Kollam
- Business and institutional solar in Kollam
- How to choose a solar installer in Kollam
Try the solar calculator with your bill, check the Solar Rules Checker, or read the latest Solar Daily Brief for rule changes. Common terms are explained in the glossary.
