Calculator

Solar Heat Pump Calculator

Check how well a PV system and heat pump fit together. The calculator estimates how much heat pump electricity can come from PV surplus and how much grid power remains.

Energy

Inputs

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The solar heat pump calculator does not decide whether a heat pump is generally suitable. It shows how much of its electricity demand can be covered by PV surplus in this model.

Display currencyChoose the currency symbol for entered amounts and results. No exchange-rate conversion is applied.

UnitsChoose metric, US or UK units for distance, area, volume and car consumption.

Heat pump electricity per year (kWh)

Use the heat pump calculator, manufacturer data or measured consumption. This is heat pump electricity use, not the building heat demand.

Annual PV yield (kWh)

If unknown: PV size in kWp × roughly 900–1,000 kWh/kWp/year as a first estimate.

Household use without heat pump (kWh)

Regular household use is considered first. Only remaining PV surplus can be used for the heat pump in this model.

Battery size (kWh)

Optional: a battery can shift PV surplus in time, but it cannot replace missing winter generation.

Heat pump operating pattern

Choose how well heat pump operation typically overlaps with PV generation. The calculator estimates usable PV surplus from this.

Grid electricity price ($/kWh)

This price determines the value of each solar kWh replacing grid power for the heat pump.

Feed-in tariff ($/kWh)

The solar advantage is roughly grid price minus the feed-in tariff you give up.

FAQ

Frequently asked questions

Can a PV system fully power a heat pump?

Annual yield may be sufficient on paper, but winter, weather and load profile often prevent full coverage in practice.

Why does the calculator not ask for solar share?

Because the solar share of heat pump electricity is the result users want to know.

Does a battery help with a heat pump?

Yes, mainly for shifting daytime surplus. During long winter periods, a battery helps only to a limited extent.

Should I use the heat pump calculator first?

Yes, if you do not yet know the heat pump electricity demand. Then this calculator shows what share can come from solar.

Is this professional planning?

No. Real design needs monthly data, heat load, control strategy and consumption profile.