Solar-powered EV charging with Zappi
Approximately 70% of EV charging now comes from solar between April and September.
- Location
- Sidmouth, Exeter and Devon
- Property
- 3-bed Detached
- Service
- EV Charger
- Date completed
- 2025
The situation
Existing 4 kW solar system with surplus generation during the day. New EV (Hyundai Kona) arriving. Parking 12m from consumer unit and required a longer cable run.
What we designed and installed
Myenergi Zappi 7 kW charger with solar diversion mode. Cable routed through garage with trunking. Consumer unit had capacity and no upgrade was needed. Solar diversion configured to prioritise car charging from surplus PV.
| Component | Specification |
|---|---|
| EV Charger | Myenergi Zappi 7 kW |
| Monitoring | myenergi app |
| Tariff configured | Time-of-use EV tariff |
How we set it up
Charging schedules, diversion thresholds, and charger controls were configured and tested against daytime solar availability and overnight tariff windows.
Results
Approximately 70% of EV charging now from solar (April-September). Annual charging cost estimated at approximately GBP180 versus approximately GBP850 on public chargers.
| Metric | Value | Basis |
|---|---|---|
| Annual savings | Approximately GBP670/year versus public charging | Estimated - Time-of-use EV tariff |
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 cable route was neat despite the long run and the solar-diversion setup worked from day one."
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