Son of Surya · Plan your rooftop solar

Your location and electricity use

Start with your state and your monthly units. This alone gives you a first estimate.

State Your electricity use

Your electricity rate (₹ per unit)

Energy charges ÷ units billed. Fixed charges aren't reduced by solar.

Connection type

Don't know your units? Estimate from appliances

Your roof

Measure the open, shade-free part of your roof. A tape measure and a few minutes is enough.

Roof type

Length, north to south (m)

Width, east to west (m)

Area taken by water tank, stairs, etc. (m²)

Which way does the roof slope face?

Shade on the roof between 9 am and 4 pm

Check in winter if you can: the sun is lower and shadows are longest.

Your system

The recommended size, how much it will produce each month, and what it saves you.

Equipment and checks

A parts list for your system, with electrical checks that panels and inverter work together.

Panel details

Defaults are a typical 540 W panel. Copy values from the datasheet of the panel you're offered.

Power (Wp)

Voc (V)

Vmp (V)

Isc (A)

Imp (A)

Voc temp. coeff. (%/°C)

Length (m)

Width (m)

The panel model is on MNRE's ALMM listApproved List of Models and Manufacturers. Ask the installer for proof.
Panels are DCR (made in India with Indian cells)Required to receive the PM Surya Ghar subsidy.

Inverter details (optional)

Leave empty to use typical values for the recommended size. Fill in from the inverter datasheet once you have a model.

Rated power (kW)

Max DC voltage (V)

MPPT min (V)

MPPT max (V)

Number of MPPTs

Max input current per MPPT (A)

Subsidy and approvals

What you can get from PM Surya Ghar: Muft Bijli Yojana, and the steps to get it. Tick each one as you finish it.

Before you apply

Application steps

Apply at pmsuryaghar.gov.in. Some states pay an extra subsidy; ask your DISCOM.

Check an installer's quote

Enter up to two quotes. We compare each against your own system and flag what's missing or unusual.

Your Solar Project Passport

Everything about your project in one place. Show it to installers so every quote is for the same system.

Son of Surya · Solar Project Passport · sonofsurya.com ·

This is a free self-check estimate. To use it for DISCOM approval, get it checked and completed by a solar engineer: satellite roof layout, shadow analysis, SLD, DISCOM-ready planset, final BOM and datasheets.

Preliminary estimates for understanding only, not a design or quotation. Final sizing, electrical design, approvals and net-metering must be confirmed by a qualified installer or engineer and your DISCOM. Subsidy values follow PIB fact sheets for PM Surya Ghar: Muft Bijli Yojana; check the national portal for current terms.