Solar and a 20 kWh battery on a new build in Woburn Sands

Limited roof space on a new build, so the storage did the heavy lifting. The homeowner later introduced the neighbours, who had a system of their own fitted.

All-black solar panels on the south-facing rear roof of a new-build house in Woburn Sands

Quick facts

System size: 3.88 kWp
Panels: 8 × Aiko A485-MAH60Mw, 485 W
Mounting: On-roof, Fastensol FTH01 pantile rack
Inverter: Solis S6-EH1P6K-L-PLUS, 6 kW hybrid
Battery: 4 × Dyness DL5.0C Pro — 20.48 kWh nominal, 19.44 kWh usable
Backup: No whole-home backup
EV charger: None
Roof: Concrete tiles, south-facing rear, 32–35°, one face
Grid connection: G99, approved in two weeks
Installed: May 2026
MCS estimated generation: 3,759 kWh a year
Estimated savings: £861 a year
Estimated payback: 7 years

Estimated at quote stage based on the customer’s usage and tariff at the time. Actual savings vary.

Why they got in touch

A homeowner in Woburn Sands was buying for the long run rather than for a headline figure: “just looking for whatever is best ROI… back is south facing so it’s perfect… thinking of solar + battery.” Two people live in the house.

What we recommended and why

The roof was the constraint. A south-facing rear face on a new build, but not much of it — eight panels was the honest maximum, giving 3.88 kWp. On its own that is a modest system.

So we put the weight into storage instead: four Dyness 5 kWh units, 20.48 kWh in total, on the garage wall. With that much capacity the house can fill the battery on a cheap night rate and run on it through the day, which earns its keep whether or not the sun is out. The customer had done their own research and had asked about a 16 kWh alternative; we talked it through and settled here.

The inverter was also upgraded from the 3.6 kW originally quoted to a 6 kW Solis hybrid, so the battery could charge and discharge at a sensible rate.

The install

No shading to work around and a single clean roof face, so the roof side was straightforward. The G99 went in on 27 April and was approved on 11 May.

The result

A small array and a large battery — the right balance for a house with limited roof and an off-peak tariff. The MCS certificate puts estimated generation at 3,759 kWh a year. The homeowner went on to introduce their next-door neighbours, who had their own system fitted shortly afterwards.

Photos from the job

Solar panels on a tiled roof against a blue sky, seen from below — Eight 485 W panels was all the usable roof would take, so the system was balanced with a much larger battery.

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