Tesla Powerwall 3 vs EcoFlow PowerOcean: Real Compare
Single-unit premium vs modular value. Powerwall's 13.5 kWh + whole-home backup vs PowerOcean's 5-15 kWh modular flexibility and 15-year warranty.
PowerOcean is the better starting point for 90% of Scottish customers — modular sizing, longer warranty, lower entry cost. Powerwall wins where whole-home EPS and single-unit simplicity matter more than payback maths.
Side-by-side spec compare
| Spec | A | B | Winner |
|---|---|---|---|
| Usable capacity | 13.5 kWh (fixed) | 5 / 10 / 15 kWh modular | B |
| Continuous power | 11.5 kW | 5 kW | A |
| Hybrid inverter included | Yes (11.5 kW) | Yes (5 kW) | A |
| Warranty | 10 yrs | 15 yrs | B |
| EPS backup | Whole-home | Selected circuits | A |
| Battery chemistry | NMC | LFP (safer + longer-life) | B |
| Phased expansion | Add second Powerwall | Stack 5-kWh modules | B |
| Entry price installed | £10,500 (13.5 kWh) | £6,800 (5 kWh) | B |
| Full-size price | £10,500 | £11,500 (15 kWh) | A |
| Lead time (peak) | 14-18 weeks | 3-5 weeks | B |
Which one is right for you?
5 kWh now, stack to 10 or 15 in year 3 once savings are proven.
15-year warranty vs 10-year — meaningful for late-payback period.
Powerwall whole-home EPS is genuinely category-leading.
Single 13.5 kWh fits when you need the capacity and one install.
PowerOcean lead time is much shorter during summer peak.
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