Products — Sigenergy × Fox ESS
Athena designs around your usage and your roof, then fits the platform that earns you more — Sigenergy’s SigenStor tower or Fox ESS’s wall-mounted packs.
The hardware — Sigenergy × Fox ESS
Two best-in-class storage platforms. We design around your usage and roof, then fit the one that earns you more.
Best for: whole-home backup, bigger roofs, and households that plan to add an EV.
Design with SigenStorBest for: tighter spaces, retrofits to existing panels, and value-focused installs.
Design with Fox ESSPublished packages — 2026
Four packages, each with its price on show — so you know where you stand before the survey.
Sigenergy
All prices are subject to survey.
Sigenergy
All prices are subject to survey.
Fox ESS
All prices are subject to survey.
Fox ESS
All prices are subject to survey.
Side by side
How the two platforms differ, then the package prices side by side.
| Side by side | SigenStor | Fox ESS |
|---|---|---|
| Form factor | Floor-standing modular tower | Wall-mounted, stackable packs |
| Battery capacity | 6 kWh and 9 kWh modules — stack as you grow | Stackable packs, sized to your evenings |
| Inverter | Hybrid inverter built into the tower | Built to pair with hybrid inverters |
| EV charging | Optional DC fast-charge module for the stack | Separate EV charger installation available |
| Best for | Whole-home backup, bigger roofs, adding an EV | Tighter spaces, retrofits, value-focused installs |
| 10-panel package | £8,000 · 3.6 kW inverter · 6 kWh battery | £7,500 · 3.6 kW inverter · 5 kWh battery |
| 16-panel package | £11,000 · 6 kW inverter · 12 kWh battery | £9,500 · 6 kW inverter · 10 kWh battery |
All prices are subject to survey. Package prices are our published 2026 pricing.
One team, either platform
Whichever platform suits your home, the people fitting it don’t change — MCS-certified installations by a NAPIT-accredited team, with RECC consumer-code membership, and full insurance.
Every package starts with a survey: we look at how much electricity you use, when you use it and how much spare generation your panels produce before recommending a capacity — so you are not paying for storage you do not need.
We tailor solar systems to your needs
We use high-performance materials and proven systems
We include comprehensive warranties and protection
Start your design — tomorrow’s sun is free
Tell us about your roof and your evenings — we’ll design a solar + storage system around them.