Quality Power
ControlsVijayawada
Call Now WhatsApp

Size your
rooftop solar.

Enter your electricity bill or monthly units and your roof details. You get a system size, panel count, expected generation and an approximate bill offset in seconds.

Your usage

01 / 02

Your average bill amount.

Energy charge per unit, from your bill.

Caps a grid-tied size if entered. Leave 0 to skip.

Your roof & panels

02 / 02

Total open terrace / roof area.

Shade-free area after tanks, stairs and walkways.

Annual average; ~4.5 to 5.5 is common in Andhra Pradesh.

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

How much of your usage solar should cover.

Estimated system

Modeled estimate
–kWp

Recommended system size.

Panels–
Generation / month–
Generation / year–
Approx. bill offset–per month
Approx. remaining bill–before fixed charges
Roof area needed–
Monthly usage–
System costOn quotationPriced after a site survey
    Illustrative monthly generation (kWh)

    The yearly total is spread with an illustrative monsoon profile (lower June–September). Not measured data.

    Check payback in ROI calculator Ask for a quotation
    Add your name & site to the PDF (optional)

    Printed only on your PDF. Nothing is sent anywhere — the report is made in your browser.

    How this is calculated
    • Monthly units = bill ÷ tariff (unless you enter units).
    • Required kWp = units × offset ÷ (30 × sun hours × (1 − losses) × orientation factor).
    • Panels are rounded up, then capped by usable roof area (module footprint × 1.15 spacing) and by sanctioned load if entered.
    • No subsidy, incentive or equipment price is assumed. A system price is given only in a formal quotation after a site survey.

    Modeled estimate, not a guarantee or a quotation. Actual generation depends on shading, weather, equipment and installation. Actual savings depend on fixed/demand charges, slab tariffs, net-metering eligibility and your DISCOM's current rules.

    ← All Solar Tools