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Calculators/Science/Renewable Energy

Renewable Energy calculators

Sizing and running-cost maths for solar, batteries and heat pumps: panel count, inverter loading, self-consumption value and payback on real figures.

Solar System SizingSolar array size and panel count needed for a target daily usage, with optional battery sizing.Heat pump running costYearly cost of heating with a heat pump at a given seasonal efficiency, set against a gas boiler and plain electric resistance heating.Solar self-consumption valueWhat a solar array is worth once exports are paid at a lower rate than imports, and what raising self-consumption is worth.Inverter DC to AC ratioWhether a solar array is oversized for its inverter, and how much power the inverter would hold back at full sun.Home battery arbitrage valueWhat a battery earns by charging at the off-peak rate and discharging at the peak rate, once round-trip losses are paid for.Solar Payback PeriodYears to recoup a solar system's net cost from its annual electricity bill savings.Off-Grid Battery SizingBattery capacity needed to cover a daily energy load for a chosen number of autonomy days.Solar Panel Tilt AngleRule-of-thumb fixed tilt angle from latitude, for year-round, winter or summer weighting.Solar Energy YieldEstimated annual output from a solar array, from its size, sun hours and system efficiency.Battery RuntimeHow long a battery powers a continuous load, from capacity, depth of discharge and wattage.

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