Completed September 2025 · Parkwijk
1930s house with home battery
Fourteen panels on the south-facing roof and a 10 kWh home battery in the utility room, for a family with a heat pump.
- Panels
- 14 × 440 Wp, full-black
- Output
- 6.2 kWp
- Orientation
- south, 45°
- Battery
- 10 kWh, LFP
- Fitting
- 1.5 days, 3 fitters
- Yield year 1
- meter still running
From question to first year
- 01
The wish
A family with a heat pump and a high electricity bill in winter and in the evening. They wanted to know whether a home battery would really pay off for them.
- 02
The roof
A steep south-facing roof with a chimney in the middle. In the layout we keep a space free around the chimney, so no full row is in shade.
- 03
The solution
Fourteen panels and a 10 kWh battery in the utility room. The control tops up during the cheap hours of their dynamic contract and supplies the heat pump in the evening.
- 04
So far
In the first six months they used 71 per cent of their solar power themselves. Without a battery it would be around 30 per cent.
The layout
Yield per month
Expected according to the calculation: this roof's meter hasn't been running for a year yet.
- 149Jan
- 264Feb
- 460Mar
- 661Apr
- 759May
- 747Jun
- 753Jul
- 650Aug
- 506Sep
- 351Oct
- 184Nov
- 115Dec
What can your roof do?
A roof scan costs nothing. Five working days later we email a layout and an honest calculation, even if the answer is that it doesn't pay off for you.