The owners of this chalet bungalow have replaced their oil-fired range
cooker with an air source heat pump. At the same time we installed a
5.4kW PV array to help to offset some of the additional electricity
consumed by the heat pump, with any surplus used to supplement the hot
water cylinder via a PV diverter switch.

Our heat loss analysis showed that an 8kW NIBE F2040 heat pump would
match the peak heating and hot water load without any alterations to the
existing wall-mounted radiators. We decommissioned the existing vented
hot water cylinder and replaced it with a 200L NIBE Megacoil mains
pressure hot water cylinder.

The PV array comprises 12 JA Solar 450W polycrystalline modules (nominal
capacity 5.4 kW) mounted on-roof. To mitigate the impact of shading from
the dormer we used a Solaredge HD Wave inverter with individual power
optimisers for each module.

A Myenergi Eddi PV diverter switch diverts any surplus power generated by
the array to the immersion heater to heat the hot water. This increases
self-consumption of the power generated by the array and helps to reduce
the electricity consumed by the heat pump.