● Solar calculator

Calculate your energy savings today

Whether you are sizing a home rooftop, a C&I portfolio or a factory — get an instant estimate for system size, cost and payback.

Solar System Size Calculator

Step 0 · Location

Fetching live data

Search, drop a pin, or use your current location — feeds the live NREL PVWatts lookup for sizing and the monthly yield chart.

Site Location

Used to determine local solar irradiance data

Latitude (-90 to 90)

Longitude (-180 to 180)

Ahmedabad, Gujarat, India

23.0300°N, 72.5800°E

Solar panel selection (optional)

Uses actual module efficiency and dimensions to estimate panel count.

Manufacturer

Model

Array configuration

Feeds the live NREL PVWatts lookup for a site-accurate yield when available.

Tilt (°)

Azimuth (°)

DC/AC ratio

System losses (%)

180° azimuth = due south · 0° tilt = flat · defaults: tilt ≈ latitude, 15% losses, 1.1 DC/AC ratio.

Step 1 · Data input

Enter your average monthly electricity bill in INR.

Average monthly electricity bill (INR)

Step 2 · Customer category

Step 3 · Electricity unit cost

Rate per unit (₹ / kWh)

Frequently asked questions