SolaX · 5.0 kW · 1-phase AC-coupled battery inverter
SolaX X1 FIT G4 5kW AC-coupled inverter
The X1 FIT G4 5.0 is a single-phase AC-coupled battery inverter for retrofit storage work: it adds a high-voltage battery to a property whose solar is already up and generating. The existing PV inverter stays untouched, which is exactly why battery-only installers specify it.
Delivery in 3–5 working days (estimate). The dispatch clock starts at cleared payment.
Description
AC coupling is what makes this a retrofit tool. The generation side stays as it is, and the X1 FIT manages the new HV battery alongside it, so the quote stays scoped to the storage work alone. At 5.0 kW on a single phase it covers the common domestic retrofit brief, and because it is a G4 unit it draws on the same SolaX parts ecosystem as the rest of the range, meaning meters, dongles and battery cabling can all land in one order from one supplier.
Specification
| Brand | SolaX |
|---|---|
| Part number | X1-FIT-G4-5.0 |
| Power rating | 5 kW |
| Phase | Single-phase |
| Condition | New |
| Category | Inverters · Charger-Inverter |
| Delivery method | Parcel courier |
What it pairs with
It only becomes a storage system once batteries are attached: pair it with SolaX Triple Power HV stacks such as the T-BAT-H-6.0. Add the M1-40 single phase CT energy meter and a Pocket WiFi 2.0 for communications. Battery support depends on model and firmware revisions, so check SolaX's current pairing and stacking list before quoting.
Single-phase only, and above 3.68 kW this needs G99 approval before install. It ships without storage: usable capacity comes entirely from the HV batteries you connect. 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