Reference / Tools
Tools
Calculators that show their working. No marketing-friendly round numbers and no postcode form that just sends your details to an installer.
solar
Solar payback estimator
Roof orientation, shading, tariff and behaviour. Year-by-year breakdown with assumptions visible.
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battery
Battery sizing
Drop in your evening load shape. Returns the smallest battery that captures most of your shiftable energy.
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ev
EV running cost
Smart-tariff overnight charging compared against standard rates and against an ICE equivalent.
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heat
Heat loss estimator
A rough check on the survey number your installer is quoting. For spotting an oversized quote, not a substitute for a proper calculation.
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