Introducing the Fox ESS EPS Box SP: Effortless Whole-Home Backup

As energy reliability becomes a growing concern for homeowners, demand for seamless, whole-home backup systems is on the rise. At Fox ESS, we’re proud to launch the new EPS Box SP, a compact, cost-effective solution that delivers true whole-home energy resilience — without the complexity or cost of third-party switching systems.

What Is the EPS Box SP?

The EPS Box SP is a dedicated backup switching device designed specifically for Fox ESS single-phase hybrid systems. It acts as the link between the grid, the inverter, and the household circuits — enabling the system to automatically switch to backup power in the event of a grid failure.

Unlike traditional EPS setups that power only a limited number of essential loads, the EPS Box SP is designed to support whole-home backup, keeping all appliances and circuits running as normal during an outage (subject to system sizing and installer configuration).

Simple to Install. Seamless to Use.

One of the biggest challenges with traditional backup solutions is the cost and complexity of integrating third-party ATS (automatic transfer switch) systems. The EPS Box SP removes that barrier, offering an all-in-one solution that pairs directly with Fox ESS inverters.

Key benefits include:

  • True whole-home EPS capability
  • Fast, automatic switching in the event of grid failure
  • Compact, installer-friendly design
  • Optimised for Fox ESS single-phase hybrid systems
  • No third-party switchgear required

Ideal for UK Homes and Energy Security

With growing adoption of home energy storage, solar PV, and time-of-use tariffs, UK households are increasingly looking to take control of their power. The EPS Box SP offers a dependable and future-ready backup solution — whether you’re looking to keep your heating running, protect refrigeration, or maintain home office continuity during outages.

It also integrates seamlessly with our Fox ESS app, allowing users to monitor system status, set charge schedules, and view backup performance in real time.

Available Now from Fox ESS

The EPS Box SP is now available to order through Fox ESS distribution partners. It’s fully compatible with our existing single-phase hybrid inverter range and supports the latest firmware enhancements for smart switching.