• MCS-certified products
  • Next Day Delivery
0800 193 6010 sales@clearraysolar.com
Fox AC 5.0kW Charger Inverter Gen 2
Fox ESS 4 IN STOCKReady for immediate dispatch

Fox AC 5.0kW Charger Inverter Gen 2

FE-AC1-5.0
£653.63 ex VAT £784.36 inc VAT

How many inverters do you need?

Secure Checkout 14-Day Returns Tracked Delivery
High Conversion EfficiencyMore of your solar reaches the home
MPPT TrackingMaximises yield in changing light
Grid CompliantMeets UK G98 / G99 requirements
Technical Specifications
Rated Power (Pmax)5,000 W
Battery TypeLithium
Max AC Power (5 min)5,500 VA
Height418 mm
Width434 mm
Depth185 mm
Weight22 kg
IP RatingIP65
Operating Temperature-25 °C to +60 °C
View Full Datasheet

Fox ESS Fox AC 5.0kW Charger Inverter Gen 2

Fox ESS · AC1 Series charger inverter, Gen 2

Fox AC 5.0kW Charger Inverter Gen 2

Fox ESS AC1 Series charger inverter, Gen 2 — Adds a high-voltage Fox battery and an EPS output to a solar system that already works.

An AC-coupled battery inverter exists for one situation: there is already a working solar system, and replacing the inverter to add a battery would mean throwing away something that works. It sits on the AC side instead, charges the battery from the existing array or from the grid, and leaves the original inverter alone.

Rated AC power
5,000 WContinuous output
Backup output
5,000 VAContinuous power in an outage
Architecture
AC coupled, single phaseHow it connects
Overview

About the Fox ESS AC1 Series charger inverter, Gen 2

The AC1 Gen 2 is Fox's single-phase version. It charges a high-voltage Fox battery at up to 40 A, carries an EPS output rated at the full machine with a peak of 4,400 or 6,000 VA for sixty seconds, and switches in under 20 ms.

High voltage on the battery side is the reason it uses thinner cable than a 48 V retrofit for the same power, and it reaches 98.50 % charge efficiency from PV to battery and 97.00 % from battery to AC.

IP65 and wall mounted, naturally cooled at 35 dB, with up to ten units in parallel.

Compatibility

What does this work with?

This is an AC-coupled battery inverter: no PV input, a high-voltage Fox battery on the DC side and an EPS output for backup.

The battery is a Fox high-voltage stack, 80 – 480 V, at up to 40 A charge and discharge, over CAN. There is no PV input — the array stays on whatever inverter it is already on.

For the installer

Battery, backup and metering

The details that decide whether this suits the system:

  • No PV input. The AC1 shares a datasheet with the H1 hybrid, where the PV section is marked as applying to the hybrid only.
  • Battery is lithium (LFP) at 80 – 480 V with a maximum charge and discharge current of 40 A, over CAN.
  • EPS output is rated at the full machine, peaks for sixty seconds, and switches in under 20 ms. Up to ten units run in parallel.
  • Battery charge efficiency from PV to battery is 98.50 % and discharge from battery to AC 97.00 %.
  • Where batteries are installed side by side rather than stacked, Fox recommend the FE-HV2600-EXT-1M extension.
  • 434 × 418 × 185 mm and 22 kg, wall mounted, IP65, natural cooling at 35 dB, standby under 15 W.
  • −25 to +60 °C, 0 – 100 % humidity, 2,000 m. RS485, DRM, ripple control, USB and CAN; Wi-Fi standard with LAN and 4G optional.
Applications

Where this earns its place

The AC1 Series charger inverter, Gen 2 is specified most often for these jobs.

Retrofitting a battery to an existing arrayNo change to the PV inverter.
Adding backup to a grid-tied systemFull-rated EPS output.
Grid charging on a time-of-use tariffCharges from the AC side.
Sites with long DC runsHigh-voltage battery, thinner cable.
Outdoor installationIP65, natural cooling at 35 dB.
Larger single-phase homesUp to ten units in parallel.
Before you order

Things worth knowing about this listing

These notes come from us and from the manufacturer, and they are the ones that most often cause a problem after delivery:
  • Where batteries are installed side by side rather than stacked one on top of the other, Fox recommend the FE-HV2600-EXT-1M extension.
  • Register the installation with Fox ESS to activate the extended product warranty. The warranty document on this listing has the terms.
Technical specification

Fox ESS AC1-5.0-E-G2 technical data

This product
Modules in this productOne AC-coupled inverter; the battery is a Fox high-voltage stack, ordered separately
Rated AC power5,000 W
Maximum apparent power5,500 VA
Backup output5,000 VA
Peak backup output6,000 VA for 60 s
Rated current22.7 A
Dimensions (W × H × D)434 × 418 × 185 mm
Weight22 kg
Common to the range
Battery typeLithium (LFP)
Battery voltage range80 – 480 V
Maximum battery charge / discharge current40 A
Battery communicationCAN
Rated grid voltage220 / 230 / 240 V
Rated grid frequency50 / 60 Hz
Power factor1, adjustable 0.8 leading to 0.8 lagging
Total harmonic distortion<3 % at rated power
EPS switch time<20 ms
Units in parallel10
Battery charge efficiency, PV to battery98.50 %
Battery discharge efficiency, battery to AC97.00 %
InstallationWall mounted
CoolingNatural, 35 dB
Standby consumption<15 W
Operating temperature range−25 °C to +60 °C
Humidity0 – 100 %, no condensation
Maximum altitude2,000 m
Ingress protectionIP65
CommunicationRS485, DRM, ripple control, USB, CAN; Wi-Fi standard, LAN and 4G optional
DisplayLCD, app and website
Compliance and warranty
CertificationEN 62109-1, EN 62109-2; G98, G99, EN 50549, AS/NZS 4777.2
WarrantySee the warranty document attached to this listing
Specification sourceData Sheet Fox ESS AC1 Gen 2 EN, version 1.1, 28 March 2025
Frequently asked questions

Questions we get asked about this inverter

Can I connect solar panels to it?

No. The AC1 is AC coupled and has no PV input — that is what makes it a retrofit product. The array stays on the inverter it is already on.

Which battery does it take?

A Fox high-voltage stack in the 80 to 480 V window, at up to 40 A.

Will it give me backup?

Yes, an EPS output rated at the full machine with a sixty-second peak and a switch time under 20 ms.

Can I fit more than one?

Up to ten units in parallel.

Does it need anything for side-by-side batteries?

Fox recommend the FE-HV2600-EXT-1M extension when batteries are installed side by side rather than stacked.

ClearRay Solar

Documents, advice and trade pricing

Every datasheet, certificate, installation manual and warranty document we hold for this product is in the Documents tab below. See the rest of our storage range, our hybrid inverters and our batteries, or email sales@clearraysolar.com if you would like us to check a pairing before you order.

IP65 RatedBuilt for UK weather conditions

Build your complete solar system

Everything you need in one place.

  • Inverters
  • Batteries
  • Mounting Systems
  • Cabling & Accessories
  • Protection Devices
Build a system
Documents & Certificates
CE Declaration of Conformity AC1/H1/AIO EN Data Sheet Fox ESS AC1 Gen 2 EN G100 certification Amendment 2 FoxESS 1PH G100 certification H1/AC1 Range - EN
Shipping & Returns

Delivery times vary by region:

  • UK — 1-2 business days
  • Highlands & Islands — 1-2 business days

Returns accepted within 14 days of delivery for unused items in original packaging.