Working tools
Calculators that show their working. No round numbers, no marketing-friendly outputs, no postcode form that just sends your details to an installer.
Solar
Inputs: roof orientation, tilt, shading factor, your tariff and your consumption shape. Output: a year-by-year breakdown including degradation, with the assumptions visible.
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Battery
Drop in your evening load shape. The calculator returns the smallest battery that captures most of your shiftable energy, not the largest one your installer can sell you.
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EV charging
Smart-tariff overnight charging compared against standard rates and against an ICE equivalent. Includes home losses and degradation.
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Heat pumps
A rough check on the survey number your installer is quoting. Useful for spotting an oversized quote, not a substitute for a proper room-by-room calculation.
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