The starting point
A society’s common-area connection, covering lifts, water pumps, corridor and campus lights, uses about 7,000 units a month at around ₹8 per unit, so the bill is about ₹56,000.
How we size it
At 3.9 units per kW per day, 60 kW covers that load. The terrace is shared, so the design keeps clear paths to tanks and lift rooms and leaves space for maintenance.
| Estimate | |
|---|---|
| System cost before subsidy | ₹29–35 lakh |
| PM Surya Ghar support for group housing (₹18,000 per kW) | ₹10.8 lakh |
| Net cost to the society | ₹18–24 lakh |
| Monthly saving | about ₹47,600 |
| Simple payback | about 3 to 4 years |
What the bill looks like after
Fixed charges stay, so the common-area bill falls to about ₹8,400 a month. The saving shows up as lower maintenance charges for every flat.
What we would do for the society
Present the design and numbers at the committee or general body meeting, prepare the resolution and subsidy filing, run a fair comparison of installer quotes and supervise the work.
Illustrative example built with the same assumptions as our solar calculator. Group-housing support has conditions; we confirm current terms before filing.
