A full-house renovation in Auchterarder — the kind of project where the electrical first-fix is still open and decisions about future energy kit can be built in rather than bolted on. The owners came to us early, so the solar and storage were designed as part of the house, not as an afterthought to it.
In-roof, not on-roof
The 17 × 405 W panels sit in the roof rather than on it — mounted flush with the slate so the finished surface reads as one continuous plane. It’s a cleaner look than standard on-roof mounting, particularly on a newly built or re-roofed property where you can integrate the tray system from the start. No clamps, no visible rails, no shadow gaps.
What we installed
- 17 × 405 W panels (6.9 kWp total) — in-roof tray system, pitched across two roof sections to make best use of the orientation
- 5 kW hybrid inverter — sized to the panel array and the household’s expected consumption profile
- 9 kWh Sigenergy battery — outdoor-rated, wall-mounted with proper AC and DC isolation
- Consumer unit and metering specified around the finished system from day one, not a retrofit patched into existing wiring
Why these sizes
At 6.9 kWp of generation against a 5 kW inverter, the system is mildly inverter-limited on the sunniest days — a deliberate choice. An oversized DC array means the inverter runs closer to its rated output for more of the year (better capture on average days), while the small amount of clipping on peak-summer afternoons is energy that would otherwise go straight to export at very low SEG rates anyway. The 9 kWh battery is sized to shift a full evening’s base load off the grid without over-buying capacity that would never fully cycle.
Outcome
Commissioned April 2026. With the system integrated during renovation, the owners move into a finished house that’s already generating, storing, and using its own power — no second phase of disruption, no patched-in conduit runs, no chased walls.
