For homes & businesses

See what solar could do on your roof

Name: SriWatt
Brand: SriWatt

Point at your rooftop, enter your electricity bill, and get system size, roof area, savings and payback — based on measured sunlight at your location, not a generic average.

Step 1 — Your site

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Search your address or drag the pin onto your roof — outlining the roof and marking any exclusions (chimneys, AC units, skylights) is optional but gives a more accurate estimate. Works with manual coordinates too.

Step 2 — Who is this for?

Sets your tariff band (~€0.15/kWh) — used to size savings, and to fill in your peak units if you skip that field.

Step 3 — Your electricity usage

or upload a PDF of your bill instead

Your highest monthly kWh from the past year (as on your bill). We size from that peak so the system covers your busiest month.

Monthly bill amount (EUR) — required

Average monthly bill in EUR — we keep this figure alongside your peak usage above.

Your rate per kWh (optional)

Know your exact per-unit rate? Enter it for a sharper savings estimate.

3 free previews per day. Verify your email once to see results.

Your estimate

Your recommendation appears below your site: system size, panels, roof area, yearly generation, savings, battery options and payback — sized with the same rules SriWatt uses for EPC projects.

System size— kW

Required roof area— m²

Annual generation— kWh

Monthly savings—

Payback— years