How big a solar system do you need?
Share your average monthly electricity bill and get an instant system size range, no site visit required for this first estimate.
Tell us your bill, we'll do the maths
As a rule of thumb, most homes need roughly 1 kW of solar for every ₹1,000 of monthly bill.
Roughly 1 kW of solar for every ₹1,000 of your monthly bill. A free site survey confirms the exact size, panel count and layout for your roof.
Enter your monthly bill
We need your average electricity bill amount to estimate a system size.
From bill amount to system size
Share your bill
Your average monthly electricity bill is the single best predictor of the system size you need.
Get an instant range
We apply the rule of roughly 1 kW per ₹1,000 of bill and round it to a safe, workable range.
Confirm with a survey
A free site visit checks your roof area, shading and orientation to lock in the exact size.
Bill-to-size guide
The same rule the calculator above uses, laid out as a table in case you want to compare a few numbers at once.
*Indicative, before subsidy, at roughly ₹60,000 per kW. Exact pricing depends on roof type, structure and component choice.
What else affects your system size
Your bill gets us to a range fast. These are the details a free site survey checks to narrow it down to one number.
Roof area and shading
Even with a high bill, limited unshaded roof space can cap how large a system physically fits.
Local sun hours
Cities with more sunny days need a slightly smaller array to offset the same monthly bill.
Panel efficiency
Higher-wattage panels generate more power per square foot, changing how much roof area you actually need.
Future consumption
Planning an EV or a new AC? We can size a little larger now so you don't outgrow the system in two years.
Budget and subsidy
PM Surya Ghar subsidy tiers can make a slightly larger system more cost-effective per kW installed.
Their online estimate said 3 to 4 kW. The site survey came back at 3.5 kW, almost exactly in the middle of the range they gave me on the website.
Questions about the estimate
Want an exact number, not a range?
Book a free site survey and we'll confirm the precise system size for your roof.