Fox ESS and Sigenergy are two of the battery systems we're asked about most. Both are solid choices with lithium iron phosphate (LFP) batteries and app monitoring, but they're designed a little differently and suit different homes and budgets.
Fox ESS
Fox ESS makes hybrid inverters and home batteries and is widely installed across the UK. Their systems pair a hybrid inverter with battery modules, and you can choose the battery capacity to suit your home.
- Good value for money
- A wide range of inverter and battery sizes
- Monitoring through the Fox app on your phone
- A well-established choice with UK installers
Sigenergy
Sigenergy's SigenStor is an all-in-one system: the inverter, battery modules and controller stack together in one unit. You can start with a smaller battery and add modules later, and there's an optional DC EV charger module that sits in the same stack.
- Modular: add battery capacity later
- Sleek all-in-one design
- Optional EV charger module
- Usually a higher price than Fox ESS
Side by side
Exact capacities, warranties and features depend on the model. Your quote will list the specific products and their warranty terms.
Which should you choose?
If you want a dependable system at a sensible price, Fox ESS is a great fit for most homes. If you'd like a premium, tidy all-in-one unit, or you're planning an electric car and want room to grow, Sigenergy is worth the extra cost.
The best choice also depends on your roof, your usage and where the equipment will go. During your survey, the installer will recommend the system that suits your home.