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Roof size to kW

How much solar fits on your roof?

आपकी छत पर कितने kW का सोलर आएगा?

Enter the shade-free roof area. See the largest system that fits, what it makes and its subsidy.

About 108 sq ft per kW. Leave out tanks, stairs and shade.

Largest system that fits

3 kW

Units a year, about

4,380

Your roof, in half-kW blocks

Central subsidy for 3 kW: ₹78,000

Estimates. Every rate used is listed with its date under Sources and dates, below.

Sources and dates(3)

Rates file as of 2026-09-27. 2 of 3 figures are verified against a primary source. 1 are not verified and are marked below.

  • Central subsidy slabs (residential)

    ₹30,000/kW up to 2kW, ₹18,000/kW for the 3rd kW, capped at ₹78,000 for 3kW and above. No CFA beyond 3kW for individual residential consumers. Scheme Cabinet-approved 29 Feb 2024; CFA effective 13 Feb 2024; admin Order No. 318/17/2024-Grid Connected Rooftop dated 16 Mar 2024. Read directly from the MNRE guidelines PDF, not the portal homepage.

    Guidelines for PM-Surya Ghar: Muft Bijli Yojana – Central Financial Assistance to Residential Consumers (MNRE)

    Effective 2024-02-13

    Verified

  • Roof area per kW

    MNRE's primary figure is '10-12 Sq.mt of shadow-free area' per kWp → 108-129 sq ft (1 sqm = 10.764 sqft). 'value' is set to the low end (108) as the conservative/minimum planning figure; 'value_range' carries the full span. The commonly quoted round number '100 sq ft/kW' (used by many EPCs and at least one state guideline) is close but slightly below this MNRE figure.

    MNRE FAQ (via PIB), 28 April 2022

    Effective Date not stated

    Verified
State and DISCOM figures (1)

  • Generation per kW, default

    Value unchanged, still unverified: no primary states a national annual average. Primaries bracket it. MNRE FAQ (PIB 28-04-2022): 'On a clear sunny day, One kWp can generate 4 to 5.5 units in a day' (a clear-day figure). UPNEDA PM Surya Ghar Information Booklet p.3 (https://upneda.org.in/MediaGallery/Documents/MuftBijliYojanBooklet.pdf): '1 kW rooftop plant typically generates 4 to 5 units of electricity daily'. UPNEDA Rooftop FAQ p.5 (https://upneda.org.in/MediaGallery/Documents/FAQRooftop.pdf): 'The average monthly generation from a 2kW system is 270 units in Uttar Pradesh' (= 4.5 kWh/kWp/day, UP only). MNRE PMSG guidelines §3(c): '1,000 billion units ... during the 25 years' from the 30 GW target, which works out to about 3.65 kWh/kWp/day averaged over life including degradation (derived, not stated). 4.0 sits inside these, at the conservative end of the MNRE/UPNEDA daily ranges. No NIWE state-by-state table located, so no per-state entries are added.

    MNRE FAQ (via PIB), 28 April 2022; UPNEDA PM Surya Ghar Information Booklet and Rooftop FAQ; MNRE PMSG CFA Guidelines §3(c)

    Effective Date not stated

    Not verified
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