Tesla Powerwall 3 vs GivEnergy AIO: Honest Compare
The premium battle: 13.5 kWh US-brand vs 9.5 kWh UK-brand. The right answer depends on how much you cycle and how much you care about UK support.
Powerwall wins on raw capacity, whole-home EPS and brand recognition. GivEnergy wins on UK support, API openness, install footprint and price. For most 3-bed Scottish homes, GivEnergy AIO at £8,400 beats Powerwall at £10,500 on payback. For 4+ bed homes with high evening loads, Powerwall's extra 4 kWh pays back.
Side-by-side spec compare
| Spec | A | B | Winner |
|---|---|---|---|
| Usable capacity | 13.5 kWh | 9.5 kWh | A |
| Continuous power | 11.5 kW | 5 kW | A |
| Hybrid inverter included | Yes (11.5 kW) | Yes (5 kW) | A |
| Warranty | 10 yrs unlimited cycles | 12 yrs | B |
| EPS backup | Whole-home, 60ms | Selected circuits (add-on) | A |
| API openness | Closed (Tesla app only) | Open (Modbus, REST) | B |
| UK support | Email + chat | Newark engineers + phone | B |
| Install footprint | Wall-mount only, 130 kg | Wall or floor, 125 kg | B |
| Price installed | £10,500 | £8,400 | B |
| Octopus Flux integration | Native + storm watch | Native + API | = |
Which one is right for you?
The extra 4 kWh genuinely matters — you fill the battery from solar and want to time-shift more.
Whole-home EPS is significantly more useful than partial-circuit backup during winter outages.
Open Modbus/REST API integrates with Home Assistant out of the box.
£2,100 cost difference covers the smaller capacity gap on payback maths.
UK company, UK engineers — easier when something needs investigating.
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