The EQ4800 is a stackable home battery you build to the size you need. Each module holds 4.66kWh, and you stack them to reach the capacity that suits your place. The smaller block size is handy: it lets you fine-tune the system rather than jumping in big steps, with capacity running from 9.32kWh up to 41.93kWh in a single stack.
It’s a high-voltage system, which is the more efficient way to do battery storage. Less energy is lost moving power in and out than with low-voltage setups, and Fox ESS rates the round-trip efficiency above 95%, so more of your solar actually ends up running the house. You get to use 90% of the battery too, so most of what you store is available rather than held in reserve.
Installation is meant to be quick. The modules are plug-and-play: they stack and connect without a lot of fiddly wiring, which keeps your installer’s time on site down. The stack is built from one master module (the EQ4800-M, which holds the system controller) plus up to eight slave modules (EQ4800-S) that add capacity, so the system grows neatly rather than turning into a tangle of separate units.
On the practical side it runs LFP (LiFePO4) cells, the stable, longer-lasting chemistry, with CAN communication, an integrated fire protection function, and an IP65 rating for dust and weather indoors or out. It charges from 0°C and discharges down to -10°C, and it’s cooled by natural convection, so there’s no fan to wear out or listen to.