For a correctly sized on-grid system, most of our residential customers end up paying only the fixed charges — usually between ₹90 and ₹300 a month against ₹3,000-₹5,000 before. It depends on how well the system size matches your usage, which is exactly what the free survey is for. We would rather show you the number from your own bills than quote you an average.

Residential rooftop systems are eligible under the PM Surya Ghar scheme, which pays a fixed amount per kW up to a cap for systems of 3 kW and above. We register you on the National Portal, get the DISCOM approvals, submit the claim and follow it up until it is credited. We charge nothing for this and we do not take a share of it. Rates are set by the government and do change, so we will confirm the current figure at your survey.

An on-grid system shuts down. That is a safety rule, not a fault — it stops your panels feeding a line that a lineman may be working on. If you want power through a cut you need the hybrid system with a battery, which costs more. We will tell you plainly whether your area has enough cuts to justify it.

On an RCC roof the structure is ballasted or chemically anchored and the roof is not penetrated at all. On a tiled or sheet roof we use proper flashing at every fixing. We have not caused a leak yet, and if we did it would be ours to fix.

Roughly 80 square feet of shade-free roof per kW with Mono PERC panels, a little less with TOPCon. Shade matters more than area — a water tank or a neighbouring wall that shades the array for two hours a day changes the design and sometimes the panel choice.

Cleaning, mainly. Dust in this region can cost you 15-25% of your output in the dry months, and rinsing the array every few weeks recovers most of it. Beyond that it is an annual electrical check. There are no moving parts.

For a residential on-grid system after subsidy, typically three to five years, then twenty more years of near-zero bills. Commercial systems are usually faster because the tariff is higher and the depreciation benefit applies.