Fox ESS · 4.14 kWh · 1-phase HV battery module (slave)
Fox ESS ECS 4.14kWh HV battery (slave)
This is the 4.14kWh slave module for Fox ESS ECS high-voltage towers. It exists for the capacity top-up: a customer whose ECS stack went in a while ago and now wants more storage on the same wall.
Delivery in 3–5 working days (estimate). The dispatch clock starts at cleared payment.
Description
A slave module has no role on its own: it joins a tower that already has a master in charge, which is exactly what makes it the right part for an extension visit. No second tower, no redesign of the original system, just another 4.14kWh added to the stack the customer already owns. For the buyer that keeps the job small and the margin clean, one line on the order and one module on the van. Price and stock are live on this page, ex VAT, the trade way.
Specification
| Brand | Fox ESS |
|---|---|
| Part number | FE-HV-ECS-4300 |
| Capacity | 4.14 kWh |
| Phase | Single-phase |
| Condition | New |
| Category | Batteries · Li-ion Battery Pack |
| Delivery method | Pallet freight (UN3480 Class 9 dangerous goods) |
Datasheets & manuals
What it pairs with
It extends stacks headed by the ECS 4.14kWh master sold alongside, and larger designs simply run more slaves with the same master. The finished stack partners with Fox single-phase hybrids such as the H1 range. Module counts and mixed-age stacking depend on the master's revision and firmware, so check Fox ESS's current stacking list before you commit the extension.
Single-phase ecosystem, and it cannot operate without a master unit heading the stack. This module adds capacity only. For anything this page can't settle, ask the trade desk before ordering or consult a competent installer.
Often bought alongside
Last updated 2026-07-19