Fox ESS H3-125-Plus 125kW Three-Phase Hybrid Inverter | Commercial Battery Storage

Description

The Fox ESS H3-125-Plus is the flagship model in the H3 Plus commercial hybrid inverter range, delivering 125kW nominal AC power and up to 137.5kVA of output for large commercial and industrial three-phase installations. Built around high-voltage LFP battery storage with 240A max charge/discharge current across three independent battery ports, it combines an 8 MPPT / 250kW PV input with sub-10ms EPS switchover and FoxCloud V2.0 remote monitoring, making it suited to logistics hubs, production facilities, and other sites where continuity of supply is critical.

125kW

Nominal AC Power

137.5kVA

Max AC Output

up to 250kW

PV Input

8

MPP Trackers

98.5%

Max Efficiency

<10ms

EPS Switch Time

Qualified Installation Required

This is a high-voltage commercial hybrid inverter operating on 380/400V three-phase supplies with battery voltages up to 950V DC. Installation, commissioning and grid connection must be carried out by a qualified, competent electrician in accordance with local grid codes and wiring regulations.

Battery Compatibility

Compatible exclusively with Fox ESS high-voltage LFP battery stacks, including the CQ16 series, connected across the inverter's three independent battery ports.

100% Unbalanced Three-Phase Output

Each phase can be loaded independently up to full capacity, so uneven commercial loads — common in sites with mixed single and three-phase circuits — don't force the inverter to derate.

Long Backup Capability

With more than 6 hours of backup power available from a fully charged battery stack, the H3-125-Plus keeps critical processes running through extended grid outages rather than just bridging short interruptions.

Sub-10ms EPS Switching

The Emergency Power Supply function switches to backup in under 10 milliseconds, fast enough that sensitive electronic loads and control systems typically ride through the transition without a reset.

Eight Independent MPP Trackers

With 8 MPPTs and 2 strings per tracker, PV arrays can be split across multiple roof orientations or shading conditions without sacrificing harvest, up to 250kW of connected array capacity.

High-Voltage Battery Architecture

Operating across a 180–950V DC battery window with 240A max charge/discharge current keeps conduction losses low even at full 125kW throughput, supporting the unit's 98.5% peak efficiency.

FoxCloud V2.0 Remote Monitoring

Built-in Wi-Fi, LAN, Bluetooth and optional 4G connectivity feed FoxCloud V2.0, giving installers and site managers live visibility across multi-inverter, multi-battery commercial deployments.

PV Input
Max. Array Power	250 kW
Max. Input Power	250 kW
Withstand Voltage	1000 V
Input Voltage Range	180 – 950 V
Max. MPPT Input Current	40 A
Max. MPPT Short Circuit Current	50 A
MPPT Voltage Range	180 – 850 V
Start-up Voltage	180 V
No. of MPP Trackers	8
Strings per MPP Tracker	2
Battery Specification
Battery Type	LFP (LiFePO₂)
Voltage Range	180 – 950 V
Max. Charging/Discharging Current	240 A (80+80+80)
Battery Ports	3
Communication	CAN × 3
AC Output (On-Grid)
Nominal AC Power	125 kW
Max. AC Output Power	137.5 kVA
Rated AC Output Current (Per Phase)	189.9 A
Max. AC Output Current (Per Phase)	198.5 A
Nominal AC Voltage	380/400V, 3W+N+PE or 3W+PE
AC Voltage Range	0.8 ~ 1.2 Un
Nominal AC Frequency	50/60 Hz
Frequency Range	50/60 Hz, ±5
Power Factor	0.8 leading – 0.8 lagging
THDi	<3% @ Rated Power
AC Input
Max. AC Input Power	207 kVA
Max. Bypass Current	300 A
Nominal AC Voltage	380/400V, 3W+N+PE or 3W+PE
Frequency Range	50/60 Hz, ±5
EPS Output (Load)
Max. AC Output Power	155 kVA
Peak AC Output Power (10s)	155 kVA
LRA Current	300 A
Nominal AC Voltage	380/400V, 3W+N+PE or 3W+PE
Nominal AC Frequency	50/60 Hz
Switching Time	<10 ms
THDv	<3% @ Rated Power
Efficiency
European Efficiency	98.1%
Max. Efficiency	98.5%
Protection
DC Input Switch	Yes
Battery Reverse Polarity	Yes
PV Reverse Polarity	Yes
AC Overcurrent Protection	Yes
AC Output Short Circuit Protection	Yes
AC/DC Surge Protection	Class II
ISO Detection	Yes
Residual Current Detection	Yes
Ground Fault Detection	Yes
AFCI	Yes
Terminal Overtemperature Protection	Yes
String Current Detection	Yes
General Specification
Dimensions (W×H×D)	730 × 1060 × 305 mm
Weight	120 kg
Operating Temperature	−30 to 60°C
Cooling Method	Smart air cooling
Operating Altitude	4000 m
Humidity	0 – 100%
Noise	<70 dB
Standby Consumption	<60 W
DC-Link EV Charger Ready	20 – 50 kW
Ingress Protection	IP65
Topology	Non-isolation
Display	LED, LCD, Wi-Fi+APP
Communication Ports	USB / RS485 / Bluetooth / Wi-Fi+LAN / 4G (optional) / CAN

Is the Fox ESS H3-125-Plus suitable for outdoor installation?

Yes, it carries an IP65 ingress protection rating and an operating temperature range of −30 to 60°C, making it suitable for sheltered outdoor plant areas as well as indoor plant rooms.

What batteries can I connect to the H3-125-Plus?

The H3-125-Plus is designed for Fox ESS high-voltage LFP battery stacks such as the CQ16 series, connected via its three independent battery ports, each supporting up to 80A charge/discharge current.

How long will the H3-125-Plus power my site during a grid outage?

With more than 6 hours of backup capability from a fully charged battery bank and an EPS switching time of under 10ms, it's designed to maintain continuity for critical commercial loads through extended outages.

Can the H3-125-Plus handle unbalanced three-phase loads?

Yes, it supports 100% unbalanced three-phase output, so each phase can be loaded independently without derating the overall system.

Does the H3-125-Plus support EV charging?

The unit includes DC-Link EV charger readiness for 20–50kW, allowing integration with compatible EV charging infrastructure.

How is the H3-125-Plus monitored remotely?

It connects via Wi-Fi, LAN, Bluetooth, USB, RS485 and optional 4G to FoxCloud V2.0, giving installers and site managers live monitoring across multi-inverter, multi-battery commercial systems.

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