5kW Solar & Battery on a Flat Roof Extension in Trowbridge
Trowbridge, Wiltshire (BA14) — 3-bed semi-detached with flat roof extension
A semi-detached home where the main roof faced east-west, making it unsuitable for a traditional south-facing array. The homeowner also had a large flat-roof extension that offered an alternative mounting opportunity.
The Challenge
The pitched roof had an east-west orientation giving reduced yield. The flat-roof extension had good southern exposure but required specialist mounting frames and membrane protection to avoid voiding the EPDM rubber roof warranty.
Our Solution
We installed 8 panels on the flat roof using ballasted tilt frames angled at 15 degrees for optimal generation without penetrating the membrane. The remaining 4 panels were placed on the east-facing pitched roof to capture morning sun. A 10kWh battery maximises self-consumption.
The Result
The split array approach generates 4,900 kWh annually — more than a pure east-west pitched installation would have achieved. Self-consumption with battery is 79%. Bills dropped from £165/month to approximately £40.
“Two other companies said our roof was not suitable. Lumos found a way to use both our flat roof and the east pitch together. The generation is better than we expected.”
S. Pearce
Trowbridge, Wiltshire
System Specifications
Interested in a similar system?
Get a free, no-obligation site survey. We'll design a system tailored to your home and goals.
Request a Free Survey 01225 632 727Related Case Studies
4.2kW Solar & 10kWh Battery in Melksham
A family home in Melksham with high evening electricity usage. The homeowners wanted to maximise self-consumption and reduce their dependence on grid electricity.
8kW Solar & 16kWh Battery in Devizes
A large barn conversion with a home office annex. Extremely high electricity usage of over £350 per month. The standing seam metal roof was ideal for solar mounting.
Get your free solar survey
Tell us where you are and lead engineer Matt Butler’s team will size a system for your actual roof — a fixed, itemised quote with 0% VAT until 31 March 2027. No pressure, no call centre.
- MCS certified · NICEIC approved · RECC member
- Employed team, not subcontractors
- 50+ verified Google reviews
Ready for Your Own Solar & Battery Installation?
Every project starts with a free site survey. We'll design a system around your property and goals.
Free survey · No obligation · Broughton Gifford, Melksham · Open Mon–Fri 8am–6pm, Sat 9am–2pm