Solar and battery on a slate roof in Botley, Oxford

The customer bought the kit themselves and asked us to fit it. A steep slate roof, panels split east and west, and a lot of storage.

Solar panels fitted to a steep slate roof in Botley, Oxford

Quick facts

System size: 5.16 kWp
Panels: 8 × Aiko G645-MCH72Dw, 645 W (customer supplied)
Mounting: On-roof, slate
Inverter: Solis S6-EH1P10K-L-PLUS, 10 kW hybrid
Battery: 3 × Dyness Powerbox G2 (customer supplied) — 30.72 kWh nominal, 29.18 kWh usable
Backup: No whole-home backup
EV charger: None
Roof: Slate, east and west faces at 46°, four panels each side
Grid connection: G99 — commissioned once approval came through
Installed: Fitted July 2026, commissioned September 2026
MCS estimated generation: 3,246 kWh a year

Why they got in touch

A homeowner in Botley had already bought the panels and the batteries and wanted a certified installer to fit and commission them properly. We do take install-only work where the kit is suitable.

What we recommended and why

Two things made this one a design job rather than a lift-and-fit. The roof is slate at 46°, which is steep, and the usable faces point east and west rather than south — so the panels went four and four, catching morning on one side and evening on the other.

East–west splits generate less at noon than a south-facing roof but spread output across more of the day, which pairs well with a large battery. There was plenty of that here: three Dyness Powerbox G2 units, 30.72 kWh between them.

The install

The panels went on in early July. Commissioning had to wait for the network operator's G99 approval, which came through in September — about two and a half months. The system was commissioned on 22 September once it was in hand.

The result

A steep slate roof, split east and west, with 30 kWh of storage behind it. The MCS certificate puts estimated generation at 3,246 kWh a year. The customer came back later that month to ask us to quote solar for their hotel.

Photos from the job

A Solis hybrid inverter and three Dyness battery units installed in a garage — Three Dyness Powerbox G2 units, supplied by the customer, with the 10 kW Solis hybrid inverter.

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