Modeled estimate

Solar sizing calculator

Enter your bill, tariff and roof details to estimate the system you need. Fixed charges, net metering and your DISCOM's rules affect real savings.

Your usage

Location

System type

Monthly electricity bill (₹)

Average tariff (₹/kWh)

Energy charge per unit from your bill.

Monthly units (optional) (kWh)

Leave 0 to estimate from bill ÷ tariff.

Sanctioned load (optional) (kW)

Caps grid-tied size if set.

Your roof & panels

Rooftop area (sq ft)

Area unit

Usable roof (%)

Shade-free area after water tanks, stairs and walkways.

Panel rating (Wp)

Peak sun hours (h/day)

Annual average on the panel plane; ~4.5 to 5.5 is common in Andhra Pradesh.

Orientation

System losses (%)

Temperature, wiring, inverter, dust. 20% ⇒ performance ratio 0.80.

Bill offset target (%)

Estimated system

Modeled estimate

Recommended size

4.32 kWp

Needed: 4.17 kWp

Panels

× 540 Wp

Roof area needed

255 sq ft

23.7 m² of 39 m² usable

Per day

17.3 kWh

Per month

518 kWh

100% of your usage

Per year

6,307 kWh

Approx. bill offset

₹3,500

per month

Approx. remaining bill

₹0

before fixed charges

Illustrative monthly generation (kWh)

Annual total spread with an illustrative monsoon profile (lower from June to September). Not measured data.

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Add your name & project to the report (optional)

Name

Phone

Project / site

Used only to print on your PDF. Nothing is sent to us.

How this is calculated

Monthly units = bill ÷ tariff (unless entered). Required kWp = units × offset ÷ (30 × sun hours × (1 − losses) × orientation). Panels are rounded up, then capped by usable roof area (module footprint × 1.15 spacing) and sanctioned load if entered.

Modeled estimate, not a guarantee or a quotation. Actual generation depends on site shading, weather, equipment and installation. Actual savings depend on fixed/demand charges, slab tariffs, net-metering eligibility and your DISCOM's current rules. No subsidy is assumed.