Heritage slate roof with partial shading
Generating approximately 4,100 kWh/year and saving approximately GBP950/year on Octopus Flux.
- Location
- Tiverton, Exeter and Devon
- Property
- Detached Cottage
- Service
- Solar Panels
- Date completed
- 2025
The situation
South-facing slate roof with partial shading from mature oak; export limitation applied by local DNO.
What we designed and installed
4.2 kW system (10x AIKO 420 W panels) with microinverters to manage shading, GivEnergy 5.2 kWh battery, export limiter configured, and monitoring set up for Octopus Flux tariff.
| Component | Specification |
|---|---|
| Solar PV | 4.2 kW - 10 x AIKO 420 W |
| Inverter | Microinverters |
| Battery | GivEnergy (5.2 kWh) |
| Monitoring | GivEnergy portal |
| Tariff configured | Octopus Flux |
How we set it up
Export settings and charging behaviour were tuned for the tariff profile, with monitoring thresholds configured and handover guidance recorded in the Evidence Pack.
Results
Generating approximately 4,100 kWh/year. Saving approximately GBP950/year on Octopus Flux with approximately 65% self-consumption. Payback projected at approximately 6.5 years.
| Metric | Value | Basis |
|---|---|---|
| Annual generation | Approximately 4,100 kWh/year | Estimated |
| Self-consumption | Approximately 65% | Estimated |
| Annual savings | Approximately GBP950/year | Estimated - Octopus Flux |
| Estimated payback | Approximately 6.5 years | Estimated (based on current tariff rates) |
Results labelled estimated are based on system modelling and typical usage patterns. Results labelled observed are based on actual monitoring data collected after installation. Observed results may differ from estimates due to weather, usage changes, and tariff adjustments.
The installation
Customer feedback
"The team explained exactly why microinverters were used and what to expect from performance through the year."
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