Solar PV Sizing Studio

Photograph a bill · get an array size

Solar PV Sizing Studio

Add a photo of your electricity bill and say where you live. That is the whole input — array size, panel count, battery and post-solar bill follow from it.

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2 · Your bills

nothing added yet
    40%

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    Adding appliances later? +0 kWh/yr

    Your bills show today's use. Add what you plan to buy so the array is sized for it.

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    2 · Where you are

    matched

    Only rounded coordinates are sent to PVGIS / NASA POWER to read the sunshine. Nothing else is sent.

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    3 · Your roof

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    4 · How much should solar cover

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    What is the battery for?

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    Recommended battery —

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    Share of your yearly use 90%

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    4 · Fine tuning tariff · array · battery

    Tariff

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    Battery

    Sun & array

    5.3 h

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    0.80

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    25-year economics

    Inverter & wiring

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    Recommended array

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    5.4 kW

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    Panels

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    Roof

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    pitched

    Inverter

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    1.15 DC/AC

    Battery

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    Self-sufficiency

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    Annual yield

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    Saving per month

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    Break-even

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    Client report

    Two A4 pages. The two names are optional, printed only when filled in, and never saved.

    Where every kilowatt-hour goes

    annual energy balance

    Your panels produce —

    split three ways

    Used as produced — Into the battery — Exported —

    Your home draws —

    from three sources

    Straight from the panels — From the battery — Still from the grid —

    Self-sufficiency

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    of your load, off-grid

    Self-consumption

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    of what you generate

    Backup runtime

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    Battery life

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    Your bill, before and after

    Energy charge Fixed fee monthly

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    Today
    grid only

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    With solar
    energy + fixed fee

    You keep

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    per month, on average

    Offset achieved—
    Grid units left—
    CO₂ avoided / yr—

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    Over 25 years

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    Net gain (NPV)

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    Return (IRR)

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    per year on the money invested

    Solar cost per kWh

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    Break-even

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    Which size pays best

    net gain over 25 years, by array size

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    Three ways to build it

    same home, same roof · tap a column to switch

    Month by month: production against use

    Used live From the battery Bought from the grid Exported Consumption

    Stacked monthly solar generation split into energy used live, stored in the battery and exported, against a flat monthly consumption line.

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    Wiring check

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    What's behind the number

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    Sizing formulakW = daily kWh ÷ (PSH × η)
    Days per month30.4
    Area per panel—
    Usable storage—
    Round-trip efficiency—
    Seasonal swing—
    Grid carbon factor0.62 kg CO₂ / kWh
    Annual degradation−0.5 % / yr (not in payback)

    A planning estimate, not a design set. The storage model runs an average day per month — real dispatch depends on your hourly load shape, cloud cover and any time-of-use tariff, and a battery is sized for outages as much as for arbitrage. Have an installer confirm with a site survey, a shade study and interval data from your meter before you buy.

    Solar PV Sizing Studio

    Solar sizing report

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    Recommended array

    — kWp

    Saving per month

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    Break-even

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    Self-sufficiency

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    Your situation

    Country—
    City—
    Consumption per month—
    Consumption per year—
    Current bill, per month—
    System type—

    Recommended system

    Panels—
    Module and array—
    Inverter—
    Battery— · —
    Roof—
    Annual yield—

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    Your bill, before and after

    Today

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    With solar

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    Saving per month

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    Annual saving

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    Return on investment

    Break-even—

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    Planning estimate, not a design study. Have an installer confirm it with a site visit before you buy.

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    Solar sizing report

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    Month by month: production against use

    Used live From the battery Bought from the grid Exported Consumption

    Main assumptions