FAQs
FAQs
Quick answers to the questions we hear most.
How much rooftop space do I need?
Roughly 100 sq ft of shadow-free roof per kW. A 3 kW home system needs about 300 sq ft; a 100 kW factory system about 10,000 sq ft.
How much electricity will my system generate?
In North India, about 4–4.5 units per kW per day on average — roughly 120 units per kW per month, varying with season, tilt and shade.
What size system do I need?
Divide your average monthly units by about 120 to get the approximate kW required. We confirm this with a site survey and your last 12 months of bills.
How long does installation take?
A home system is installed in 1–3 days. Commercial systems take 2–8 weeks depending on size. Net-metering approval by the DISCOM can add a few weeks.
Is there a government subsidy for home solar?
Yes. Under PM Surya Ghar, residential systems get ₹30,000/kW up to 2 kW and ₹18,000 for the 3rd kW — a maximum of ₹78,000. RWAs/GHS get ₹18,000/kW for common facilities. Some states, like Delhi, add their own subsidy.
Do I need DCR panels?
DCR (Indian cell + module) panels are required for subsidy-linked, government and PM-KUSUM projects, and for net-metering/open-access projects from 1 January 2027. We advise on the right choice for your project.
Is there a subsidy for commercial or industrial solar?
No central capital subsidy, but businesses can benefit from accelerated depreciation, lower tariffs through open access, and zero-investment / RESCO models.
What is net-metering?
A bi-directional meter records units you export and import. Exported solar units are adjusted against units you draw from the grid, so you pay only the net.
What is the difference between CAPEX, RESCO and zero investment?
CAPEX: you buy and own the plant. RESCO/PPA: a developer owns it and you pay per unit at a lower tariff. Zero investment: no upfront payment, you pay a solar tariff for a few years and then own the plant.
What is the payback period?
Typically 3–5 years for homes after subsidy and 3–5 years for commercial/industrial CAPEX projects, depending on tariff and usage.
Can I set up a solar plant away from my premises?
Yes. Through open access in Haryana and many other states, a plant can be built elsewhere and the power wheeled to your premises on payment of regulated charges.
Will solar work during a power cut?
On-grid systems shut down during outages for safety. For backup, choose a hybrid system with batteries.
How long do panels last?
Panels carry 25–30 year performance warranties; inverters typically 5–10 years, extendable.
How much maintenance is needed?
Periodic cleaning (every 1–2 weeks in dusty areas) and an annual check-up. IG Solar offers comprehensive O&M with remote monitoring.
Which brands do you use?
Modules from Waaree, Adani, Pahal, Goldi, RPSG Solvanta and Aroma Solar; inverters from Delta, Hitachi Energy, Statcon Energiaa, Eastman, Deye, Sungrow and Huawei; batteries from leading Indian and global brands.
Still have a question?
Our team is happy to help.