The required number of solar panels to power a heat pump depends on several factors, including the capacity of the heat pump, the energy efficiency of the system, the location, and the available sunshine hours. Here are some steps to make an estimate:

1. Determine the capacity of the heat pump:

   • The capacity of the heat pump is measured in kilowatts (kW). This capacity indicates how much energy the heat pump needs to heat your home.

2. Calculate the energy consumption of the heat pump:

   • The annual energy consumption of the heat pump is expressed in kilowatt-hours (kWh). This indicates how much electricity the heat pump consumes per year.

3. Determine the energy yield of solar panels:

   • The energy yield of solar panels is measured in kilowatt-hours per installed kilowatt peak (kWh/kWp). This indicates how much electricity a solar panel produces on average per year, depending on the location.

4. Calculate the number of solar panels required:

   • The formula is: Number of solar panels = Annual energy consumption of the heat pump / Energy yield per solar panel.

Keep in mind that this calculation is a rough estimate and other factors may influence it, such as shading, the orientation of the solar panels, the efficiency of the inverter, and so on.

Additionally, it is important to know that a heat pump is not in continuous operation, as the demand for heating depends on the outside temperature. The actual number of solar panels needed can therefore vary based on the specific circumstances of the household and the region in which it is located. It is advisable to conduct a professional energy audit to obtain a more accurate estimate.