Frequently asked questions
Everything you need to know about going solar with TPIL. Can’t find your answer? Call us or send a message.
How does a rooftop solar system work?
Solar panels turn sunlight into DC electricity. An inverter converts it to AC to run your home or business, and any surplus can be exported to the grid through a net meter.
Which solar system is right for me — on-grid, off-grid or hybrid?
On-grid is best if your grid supply is reliable — it is the cheapest and gets the subsidy. Hybrid suits areas with frequent power cuts. Off-grid is for places with no grid at all.
Do solar panels work on cloudy days?
Yes, but output drops. Panels still generate from diffused light, just less than on a sunny day.
How much roof space do I need?
About 80–100 sq ft of shadow-free space per kW. A 3 kW home system needs roughly 250–300 sq ft.
How long do solar panels last?
Quality panels last 25 years or more, with a small drop in output each year. Inverters typically last 10–12 years.
PM Surya Ghar subsidy
How much subsidy can I get?
₹30,000 for 1 kW, ₹60,000 for 2 kW and ₹78,000 for 3 kW or more, under PM Surya Ghar Muft Bijli Yojana. Some states add their own top-up.
Who is eligible?
Residential homeowners with their own roof and an electricity connection in their name. Housing societies can apply for common facilities.
Do businesses get a subsidy?
No — the scheme is for residential consumers. Businesses benefit from lower tariffs and tax benefits such as accelerated depreciation.
How long does the subsidy take?
Usually 30–45 days after your system is commissioned and the paperwork is uploaded on the national portal.
Will TPIL help with the application?
Yes. We handle the portal application, DISCOM approval, net metering and commissioning paperwork for you.
Cost, savings & finance
How much does a solar system cost?
Cost depends on system size, type (on-grid, hybrid or off-grid), panels, inverter and structure. Use our solar calculator for an estimate, or ask us for an exact quote.
How much will I save?
Most on-grid customers see their bill drop sharply from the first month. A 3 kW system generates about 4,200–4,350 units a year.
What is the payback period?
Typically 3–5 years for on-grid systems, after which your power is practically free for 20+ years.
Can I get a loan for solar?
Yes. Banks offer solar loans, including concessional loans for homes under PM Surya Ghar.
Installation & maintenance
How long does installation take?
Home systems are usually installed in one or two days. Approvals and net-meter installation by the DISCOM can take a few weeks.
Will installation damage my roof?
No. Our team uses proper anchoring and elevated structures; on metal sheds we use mono rails and FRP walkways to protect the roof.
How do I maintain my solar panels?
Clean the panels with plain water every couple of weeks, avoid harsh chemicals and high-pressure jets, and keep an eye on generation through the monitoring app.
What happens during a power cut?
On-grid systems shut down for safety. Hybrid and off-grid systems keep your essential appliances running from the battery.
Do you offer after-sales service?
Yes. Our service team supports you with monitoring, maintenance and repairs throughout the life of your system.