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

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

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

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.
$17,037.65
Fox ESS H3-125-Plus 125kW Three-Phase Hybrid Inverter | Commercial Battery Storage—
$17,037.65

Product Information

Shipping & Returns

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.