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DKS Solar

20 August 2026 · 4 min read

How many kW of solar does my home need? (with a bill-to-kW table)

A simple way to size rooftop solar from your electricity bill, plus the roof space and budget you'll need.

In NCR, each kW of solar produces roughly 120 units a month on average across the year. Divide your monthly units by 120 and you have your system size.

Quick sizing table

  • Bill ₹1,500 (≈215 units): 2 kW
  • Bill ₹2,500 (≈360 units): 3 kW
  • Bill ₹4,000 (≈570 units): 5 kW
  • Bill ₹6,000 (≈860 units): 7 kW
  • Bill ₹8,500+ (≈1,200 units): 10 kW

Roof space

Plan on about 80 sq ft of shadow-free roof per kW, so a 5 kW system needs around 400 sq ft. Elevated structures let you keep using the roof underneath.

For a figure based on your own bill, use the savings calculator on our homepage. It shows system size, subsidy, net cost and payback in seconds.

Free survey · no obligation

Book your free rooftop survey.

An engineer visits, checks your roof and gives you a fixed written quote with your exact subsidy and savings. There's no cost and no obligation.

Step 1 of 2

About 20 seconds

Where will the solar go?
What's your average monthly bill?

What happens next

  1. 1.We call you back, usually within 30 minutes during working hours.
  2. 2.An engineer surveys your roof within 48 hours, Saturdays included.
  3. 3.You get a written quote naming every brand, model and warranty.
  4. 4.We file your PM Surya Ghar subsidy at no extra cost.
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