In-roof solar and a Tesla Powerwall for a home in Hessle
This family home in Hessle has two very different roofs: a traditional
slate pitch and a modern
flat EPDM roof. The owners wanted as much solar as the house could hold, a battery to store it for the evening, and a finish that looked smart from the street. We designed one system across both roofs, built around a
Tesla Powerwall 3.
The challenge
The slate pitch has a
Velux roof window, so the array had to be planned around it rather than over it. The owners wanted a clean, built-in look, so a standard on-roof frame wouldn’t do.
On the flat roof, the panels had to stay
out of sight behind the parapets. This home also needed
planning permission, which was granted. The
DNO set a 7 kW output limit and a 5 kW export limit, so the design had to make sure the household used as much of its own generation as possible, rather than relying on exports.
What we installed
On the slate pitch, we fitted a
GSE in-roof system, with the panels sitting in the roof line in place of the slates and the
Velux worked neatly into the layout. We used the same GSE in-roof mounting on
a home in West Hull. On the flat EPDM roof, a second set of panels sits low and
hidden behind the parapets, fitted with
8 × Tigo TS4 optimisers so each panel performs at its best.
The whole system uses
26 × Aiko Neostar 455 W all-black panels, for a total of
11.82 kWp. Everything feeds into a
Tesla Powerwall 3 (13.5 kWh), which stores daytime solar for the evening and works within the DNO’s output and export limits.
Timeline
- July 2024: contract signed
- September 2024: scaffolding up and installation started
- 24 January 2025: system commissioned
Results
The MCS certificate puts expected generation at
6,579 kWh a year. At quote stage, we estimated a
first-year saving of about £1,951 and
lifetime savings of around £31,602, with an
estimated payback of 12 years. These are estimates and will vary with energy prices, tariffs and how the household uses its power.
With 13.5 kWh of storage, far more of that solar is used in the home rather than exported, which matters when exports are capped at 5 kW. As a domestic install, the system comes with our
6-year insurance-backed warranty, as well as the manufacturers’ product warranties.
Want a solar and battery system that looks the part?
See our
solar panels in Hull page, find out more about
battery storage, or read about
solar panels in Hessle.
Thinking about in-roof solar or a Powerwall? Get in touch for a free home survey and quote.
