Sigenergy
Sigenergy SigenStor
A4.7 8kWh module
A modular 5-in-1 system (inverter, battery, energy management and optional EV DC charging) that scales to 80kWh, with a standout 15-year warranty.
8.06kWh
Usable capacity
6kW
Power output
80kWh
Max with expansion
Best of 3 we compare
LFP
Chemistry
15yrs
Warranty
Best of 3 we compare
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Our verdict
The most future-proof choice: huge expansion headroom, integrated EV charging and the longest warranty here. Increasingly the installer favourite where budget allows, especially for homes planning an EV.
Good
- Expands to 80kWh
- 15-year warranty
- Optional EV DC charging
- High power
Watch out
- Premium pricing
- Newer brand in the UK
Will it pay for itself?
19.0 years to pay back a £6,500 Sigenergy SigenStor from £342 a year of off-peak savings. That's 4.0 years after the warranty ends.
A typical home using 9.3 kWh a day, 58% of it at
peak. Day rate 26.32p, Intelligent Octopus Go off-peak 8p, 89% round trip. Hardware only, so installation adds to the payback time. Rates
checked 20 September 2026. Try your own numbers
Specifications
| Usable capacity | 8.06 kWh |
|---|---|
| Power output | 6 kW |
| Max with expansion | 80 kWh |
| Chemistry | LFP |
| Whole-home backup | Yes |
| Warranty | 15 yrs |