BATTERY STORAGE COMPARISON / HOME SYSTEMS
Capacity, backup and control are different design questions
A practical comparison of Sigenergy, Fox ESS, Sunsynk, Duracell and Tesla Powerwall 3. Capacity, backup behaviour, warranty and smart features depend on the exact model and system design.
Sigenergy
System: hybrid inverter, battery and integrated EV charging option
Capacity: 9-54 kWh*
Cycle / usable energy: ~10,000 cycles; 100% DoD*
Backup: whole-home capable with compatible gateway*
Warranty: 10 years*
Fox ESS
System: hybrid inverter + battery
Capacity: 5.2-20.8 kWh*
Cycle / usable energy: ~6,000 cycles; 90-95% DoD*
Backup: EPS with suitable wiring*
Warranty: 10 years*
Sunsynk
System: hybrid inverter + battery
Capacity: 8-40 kWh*
Cycle / usable energy: ~8,000 cycles; 95% DoD*
Backup: whole-home capable in suitable configurations*
Warranty: 10 years*
Duracell
System: hybrid inverter + battery
Capacity: 5-30 kWh*
Cycle / usable energy: ~8,000 cycles; 90% DoD*
Backup: EPS with suitable wiring*
Warranty: 10 years*
Tesla Powerwall 3
System: integrated solar inverter + battery
Capacity: 13.5 kWh usable AC per unit
Cycles: unlimited for qualifying use over 10 years
Backup: Backup Gateway 2 with suitable installation
Warranty: 10 years; internet required for full term
Tesla Powerwall 3 specification snapshot
| System | Integrated solar and battery system; 230 V single phase |
| Solar input | Up to 20 kW STC; three MPPTs |
| Charging | Up to 5 kW AC configurable or 5 kW DC for one Powerwall 3 |
| Backup | Backup Gateway 2 supported; backed-up circuits depend on system design |
| Scalability | Up to four Powerwall 3 units plus up to three Expansion units |
| Monitoring | Tesla app; Wi-Fi, Ethernet and cellular connectivity |
| Environment | Indoor/outdoor rated; -20°C to 50°C operating temperature |
| Dimensions | 1105 × 609 × 193 mm; 130 kg; floor or wall mounting |
*Indicative comparison figures depend on the exact model and installation. Confirm current manufacturer datasheets, warranty terms and the proposed system design before specifying equipment. Tesla warranty detail in the supplied comparison references the European Warranty Region document dated Dec 2025.