BYD Battery-Box Premium HVS vs Fox ESS ECS Cube
A side-by-side look at the BYD Battery-Box Premium HVS and Fox ESS ECS Cube. Winning figures are highlighted.
| BYD BYD Battery-Box Premium HVS | Fox ESS Fox ESS ECS Cube | |
|---|---|---|
| Price from | — | — |
| Usable capacity (base) | 5.12 kWh | 2.59 kWh |
| Power output | 8 kW | 3.5 kW |
| Max with expansion | 22.1 kWh | 15.5 kWh |
| Chemistry | LFP | LFP |
| Backup capable | Yes | No |
| Warranty | 10 yrs | 10 yrs |
Best value per row highlighted. Prices last checked 21 July 2026.
BYD Battery-Box Premium HVS
A proven, flexible HV battery that installers know well and that works with many leading inverters. A safe modular choice; just remember the inverter is a separate purchase.
Full BYD Battery-Box Premium HVS review →Fox ESS ECS Cube
Modular pricing makes Fox ESS attractive when you want to start small and expand. Pair with a Fox hybrid inverter for the smoothest setup.
Full Fox ESS ECS Cube review →