A south-facing semi with an EV on the drive. Sixteen panels, a 9.5 kWh battery and a solar-aware wallbox.
The brief
Two adults working from home and a family EV doing 14,000 km a year. Aoife wanted the car charged from the roof, not the grid.
What we fitted
Sixteen 400 W panels, a 6 kW hybrid inverter, a 9.5 kWh battery and a 7 kW wallbox set to divert surplus solar.
Twelve months on
Roughly 60% of the car’s charging now comes from the roof. The household bill fell from €190 to €62 a month on average.
Field plate · STC
Pmax · rated output
6.4
kWp
Panels
16 × 400 W
Battery
9.5 kWh
Yield / yr
5,760 kWh
Payback
7.6 yrs
CO₂ saved
1.9 t/yr
Roof
Pitched
Switched on
Mar 20, 2025
Want a plate like this for your roof?
17:05
On the roof
18:30
In their words
The first quote that didn’t feel like a sales pitch. The estimator on their site came within €40 of our real figure.
Aoife Brennan
Blackrock