Calc‑WorldFast online calculators
DEEN
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

Calculate now

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.
If electricity use is not yet known, estimate it roughly from heat demand divided by seasonal performance factor.
Optional starting point if you do not yet know the heat pump electricity use. Use previous heat demand from gas, oil or heating bills where available.
Heat demand divided by SPF gives estimated electricity use. The higher the SPF, the less electricity the heat pump needs.
Direct heat pump electricity use. If you only know heat demand, use the estimate from heat demand and SPF above.
If unknown: PV size in kWp × roughly 900–1,000 kWh/kWp/year as a first estimate.
Regular household use is considered first. Only remaining PV surplus can be used for the heat pump in this model.
Adjusts the simplified seasonal distribution of the entered annual yield. Tilt, shading and the weather year remain separate planning risks.
Optional: a battery can shift PV surplus in time, but it cannot replace missing winter generation.
Choose how well heat pump operation typically overlaps with PV generation. The calculator estimates usable PV surplus from this.
This price determines the value of each solar kWh replacing grid power for the heat pump.
The solar advantage is roughly grid price minus the feed-in tariff you give up.
FAQ

FAQ about Solar Heat Pump Calculator

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 want a more detailed heat-pump estimate. This calculator now also allows a simple estimate from annual heat demand and SPF/SCOP.

Is this professional planning?

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