With home battery storage becoming an essential part of energy independence, the Tesla Powerwall 3 and Sigenergy SigenStor stand out as two of the best options in the UK. Both offer solar integration, backup power, and scalability, but which one is right for your home?
This detailed comparison breaks down the key differences between these two advanced battery systems to help you make an informed choice.
| Tesla Powerwall 3 | Sigenergy SigenStor | |
| Usable Capacity | 13.5 kWh | 5.2 kWh (5 kWh module), 7.8 kWh (8 kWh module) |
| Maximum Storage Capacity | 216 kWh | 48 kWh per stack, up to 240 kWh (single-phase), 2.4 MWh (three-phase) |
| Battery Chemistry | Lithium Ferro Phosphate (LFP) | Lithium Ferro Phosphate (LFP) |
| Charge Rate | 5 kW standard | 2.5 kW (5 kWh module), 4 kW (8 kWh module) |
| Maximum Charge Rate | 8 kW | 12 kW (inverter dependent) |
| Peak Output Power | 170% of rated capacity | 200% of rated capacity |
| Integrated Inverter | Yes (11.04 kW hybrid inverter) | Yes, various inverter options |
| Adjustable Inverter Settings | Yes (3.68 kW - 10 kW) | No (requires new inverter for upgrades) |
| Maximum Solar Input | Up to 20 kW | Up to 30 kW |
| Backup Power Support | Yes (Gateway 2 included) | Optional Backup Gateway |
| EV Charging Support | No integrated EVCP | Yes (V2H/V2G-ready) |
| Warranty (Battery) | 10 years (unlimited cycles) | 10 years (70% capacity retention) |
| Warranty (Extended) | Not available | 15 years (60% capacity retention, additional cost) |
| Temperature Operating Range | -20 to 50°C | -20 to 60°C |
| Weight | 130 kg | 18 kg - 456 kg (stack configuration dependent) |
| Dimensions | H 1150 mm x W 753 mm x D 147 mm | H 370 mm - 1990 mm x W 700 mm x D 260 mm (stack configuration dependent) |
| IP Rating | IP67 | IP66 |
A home battery’s storage capacity and expansion potential are crucial for meeting long-term energy needs.
Tesla’s system is easier to scale, while Sigenergy offers more customisation with its modular approach.
Both systems use Lithium Iron Phosphate (LFP) battery technology, which offers:
Tesla previously used Nickel Manganese Cobalt (NMC) but now utilises LFP for better durability—aligning with Sigenergy.
How fast a battery charges and discharges affects how effectively you can use stored energy.
Tesla has a fixed charge rate, making it ideal for predictable energy storage, while Sigenergy offers higher charge rates with multiple modules.
Tesla’s inverter is software-adjustable, while Sigenergy requires a physical inverter upgrade for higher output.
If EV charging is a priority, Sigenergy is the better choice with Vehicle-to-Home (V2H) and Vehicle-to-Grid (V2G) capability.
Tesla offers ready-to-use backup power, while Sigenergy is more customisable.
Tesla’s unlimited cycle warranty provides greater peace of mind, though Sigenergy’s extended warranty option is very handy.
Tesla Powerwall 3 - starting at £.
Tesla Powerwall 3 DC Expansion Pack when installed with Powerwall 3, saving labour cost - starting at £.
| Inverter Rating (kW) | Battery Modules | Total Battery Capacity | Estimated Price |
| 3 | 1x 5 kWh | 5 kWh | £6,100 |
| 6 | 8 kWh + 5 kWh | 13 kWh | £ |
| 12 | 6x 8 kWh | 48 kWh | £ |
*With power cut protection
To upgrade your unit with an 5 kWh module, it should cost around £.
To upgrade your unit with an 8 kWh module, it should cost around £.
To upgrade your unit with the EV DC Charger module, it should cost between £3,500 - £4,000.
Choose Tesla Powerwall 3 if you want:
Choose Sigenergy SigenStor if you want:
Choosing between Tesla Powerwall 3 vs Sigenergy SigenStor depends on your home’s energy needs and future plans.
If you’re unsure which system is right for you, contact us today for a free consultation and expert advice.