Fox ESS H3 PLUS 125kW Commercial 3-Phase Hybrid Inverter

  
By Fox ESS
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Fox ESS H3 PLUS 125kW 3‑Phase Hybrid Inverter

Key benefits

  • 125kW three‑phase hybrid inverter for large commercial and industrial sites combining high‑voltage LFP batteries with substantial PV capacity.
  • Designed for long backup capability, fast EPS switchover and 100% unbalanced three‑phase output to support critical loads on complex three‑phase supplies.
  • Integrated with FoxCloud V2.0 for advanced remote monitoring and system management across multi‑inverter and multi‑battery installations.

Brief description

The Fox ESS H3 PLUS 125kW Commercial 3‑Phase Hybrid Inverter sits at the top of the H3 Plus range, which spans from 50kW to 125kW for commercial applications. It supports high‑voltage LFP battery stacks, long backup runtimes and less than 10ms EPS switching, making it suitable for logistics hubs, production lines, data rooms and other sites where continuity of supply matters. With a wide DC voltage window, high efficiency and IP65 construction, it is well suited to indoor plant rooms or sheltered outdoor installations.

Key features

  • Three‑phase hybrid inverter with 125kW nominal AC power and up to 137.5kVA AC output on the H3‑125‑Plus model.
  • High‑voltage LFP battery support (180–950V) with up to 240A charge/discharge across three battery ports (80A + 80A + 80A).
  • PV input up to 250kW with 8 MPPTs and two strings per tracker for flexible commercial array design.
  • EPS function with less than 10ms switching time, 155kVA EPS rating and 300A LRA for starting demanding loads.
  • Colour LCD display plus LED/Wi‑Fi app interface via FoxCloud V2.0 for local and remote visibility.

Technical specifications

PV input

Max. Array Power [kW] 250 (H3‑125‑Plus)
Max. Input Power [kW] 250 (H3‑125‑Plus)
Withstand Voltage [V] 1000
Input Voltage Range [V] 180 ~ 950
Max. MPPT Input Current [A] 40
Max. MPPT Short Circuit Current [A] 50
MPPT Voltage Range [V] 180 ~ 850
Start‑up Voltage [V] 180
No. of MPP Trackers 8 (H3‑125‑Plus)
Strings per MPP Tracker 2 (all models)

Battery specification

Battery Type LFP (LiFePO₄)
Voltage Range [V] 180 ~ 950
Max. Charging/Discharging Current [A] 240 (80+80+80)
Battery Port 3
Communication CAN*3

AC output (on‑grid)

Model H3‑125‑Plus
Nominal AC Power [kW] 125
Max. AC Output Power [kVA] 137.5
Rated AC Output Current (Per Phase) [A] 189.9
Max. AC Output Current (Per Phase) [A] 198.5
Nominal AC Voltage [V] 380/400, 3W+N+PE or 3W+PE
AC Voltage Range [Un] 0.8 ~ 1.2
Nominal AC Frequency [Hz] 50/60
Frequency Range [Hz] 50/60, ±5
Power Factor 0.8 Leading ~ 0.8 Lagging
THDi [%] <3 @Rated Power

AC input

Max. AC Input Power [kVA] 207
Max. Bypass Current [A] 300
Nominal AC Voltage [V] 380/400, 3W+N+PE or 3W+PE
Frequency Range [Hz] 50/60, ±5

EPS output (load)

Max. AC Output Power [kVA] 155
Peak AC Output Power [kVA] (10s) 155
LRA Current [A] 300
Nominal AC Voltage [V] 380/400, 3W+N+PE or 3W+PE
Nominal AC Frequency [Hz] 50/60
Switching Time [ms] <10
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 (WHD) [mm] 7301060305
Weight [kg] 115 (H3‑50‑Plus/H3‑60‑Plus); 120 (H3‑75‑Plus/H3‑80‑Plus/H3‑100‑Plus/H3‑125‑Plus)
Operating Temperature [°C] –30 ~ 60
Cooling Method Smart Air Cooling
Operating Altitude [m] 4000
Humidity [%] 0 ~ 100
Noise [dB] <70
Standby Consumption [W] <60
DC‑Link EV Charger Ready [kW] 20 ~ 50
Ingress Protection (IP) Rating IP65
Topology Non‑Isolation
Display LED, LCD, Wi‑Fi+APP
Communication Ports USB / RS485 / Bluetooth / Wi‑Fi+LAN / 4G(Optional) / CAN

Shipping

Shipping is available to the UK, Ireland, Africa, the Caribbean and worldwide. If the shipping rate is not shown at checkout, please contact us on +44 2080640335 or info@energian.co.uk for a tailored shipping quote.

UK expert support

UK expert support is available to help with system design, battery sizing and integration of the Fox ESS H3 PLUS 125kW Commercial 3‑Phase Hybrid Inverter into your project. For large commercial and industrial systems we recommend installation and commissioning through our trusted partners to ensure compliance with local grid codes and safe operation of high‑voltage PV and battery equipment.

You can contact us via phone, email or live chat, or visit our office for an in‑person consultation to discuss your site requirements and hybrid system configuration.

Documents available for download