Tesla or Sigenergy,
compared honestly.
The only Tesla Premium and Sigenergy Gold installer in the UK. Here's how the two systems genuinely differ.
Two strong systems, built around different priorities.
Neither is better across the board. The right one comes down to your energy use, your tariff, your car and your plans.
Tesla Powerwall 3 may suit you if
- You want a system you set up once and rarely need to think about
- You drive a Tesla, or like the idea of one app for your car and your home
- One 13.5kWh unit covers your evenings, with whole units added if you need more
- A long track record matters to you: Tesla has sold home batteries since 2015
Sigenergy SigenStor may suit you if
- You're on a smart or agile tariff and want the battery to make the most of cheap rates
- You'd like to start smaller and add 6 or 9kWh modules as your needs grow
- You want fast DC car charging built into the same system
- You like to see the detail and fine-tune settings in the app
Either way
Both carry a 10 year product warranty, both can back up your whole home or selected circuits, and both are designed, installed and looked after by Powergy.
Side by side, in detail.
The full comparison, for when you want the specifics.
| Sigenergy SigenStor | Tesla Powerwall 3 | |
|---|---|---|
| Best for | Flexibility, tariff intelligence & expansion | Proven simplicity & the Tesla ecosystem |
| Capacity | About 6 or 9kWh modules, up to six per tower | 13.5kWh per unit, add whole units |
| Inverter | Integrated hybrid, wide size range | Integrated, 3 solar inputs |
| Backup | Via Sigen Gateway, near-seamless: whole home or selected circuits, by design | Via Backup Gateway: whole home or selected circuits, by design |
| EV charging | Built-in DC module up to 25kW, or AC charger | Wall Connector (AC), with Charge on Solar for Tesla cars |
| App | mySigen: detailed, deeply configurable | Tesla app: polished, automated |
| Dynamic tariffs | Native agile-tariff optimisation, AI mode | Savings mode |
| Home Assistant | Local Modbus + community integration | Built-in integration (local network, some limits on Powerwall 3) |
| Track record | Newer to the market, growing quickly | Selling home batteries since 2015 |
| Product warranty | 10 years (extendable to 15 years) | 10 years |
| Installed by | Powergy, Tesla Premium Certified and Sigenergy Gold Installers | |
Gateway vs Gateway.
Backup lives or dies by the gateway: the box that senses an outage and moves your home, or the circuits you choose, onto battery power. Here's how Tesla's Backup Gateway 2 and Sigenergy's Sigen Gateway SP-F compare.
| Sigenergy Sigen Gateway SP-F | Tesla Backup Gateway 2 | |
|---|---|---|
| Role | Grid isolation, whole-home metering & control | Grid isolation, whole-home metering & control |
| Backup switchover | 0 ms within the system's rated load: most homes won't notice | Automatic on outage detection, quick transition |
| Backup coverage | Whole home or selected circuits, by design | Whole home or selected circuits, by design |
| Battery expansion | Runs two SigenStor towers in parallel | Works with multi-Powerwall systems |
| Backup reserve | Adjustable in mySigen, or AI-managed | Adjustable in the Tesla app |
| Weather response | AI mode pre-positions energy around weather & tariff forecasts | Storm Watch pre-charges before severe weather |
| Live metering | Real-time, in mySigen | Real-time, in the Tesla app |
| Warranty | 5 years | Covered by Tesla's 10 year Powerwall warranty |
Specifications are indicative and depend on your supply and system design; exact figures are confirmed in your tailored Powergy proposal.
All-black, high-efficiency
Whichever you choose, the panels stay premium.
Every Powergy array uses tier-one, all-black, high-efficiency modules, selected on engineering and warranted for decades.
Explore our panelsStill weighing it up? Let's talk it through.
Tell us how you use energy and we'll recommend the right system, with the numbers to back it up.
Start my home energy design