Fox ESS H3 PRO 25kW Commercial 3-Phase Hybrid Inverter

  
By Fox ESS
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Fox ESS H3 Pro 25 kW 3‑Phase Hybrid Inverter

  • Three‑phase hybrid inverter combining PV generation and high‑voltage battery storage in one unit, ideal for larger commercial and light industrial sites.
  • 25 kVA rated output with strong DC input capability, supporting sizeable arrays and robust self‑consumption, peak‑shaving and backup strategies.
  • IP65‑rated, wall‑mounted design with remote monitoring via app and web portal, suitable for plant rooms or outdoor installations in UK conditions.

Product overview

The Fox ESS H3 Pro 25 kW Three‑Phase Hybrid Inverter sits within the H3 Pro Series and is designed for sites that need both solar generation and high‑voltage battery storage on a three‑phase supply. It integrates PV, battery and grid control into one IP65‑rated unit with flexible configuration options.

When paired with compatible Fox high‑voltage batteries, the H3‑Pro‑25.0 is well suited to logistics hubs, workshops, commercial offices and small factories requiring dependable three‑phase power, export control and backup capability. Installation should be carried out by a qualified electrician or solar installer.

Key features 

  • Three‑phase hybrid operation with 25 kVA nominal AC power and high‑voltage battery support, providing headroom for demanding commercial loads.
  • High DC power per MPPT tracker, dual MPPT and dual‑string architecture with wide MPPT voltage range for flexible array layouts.
  • Up to 10 storage inverters can be connected in parallel, enabling scalable systems as site demand grows.
  • IP65 wall‑mounted enclosure with smart fan cooling, hot and cold standby modes and non‑isolated topology.
  • Comprehensive protection including anti‑islanding, over‑current and over‑temperature protection, insulation monitoring and Type II AC/DC surge protection.

Technical specifications 

The values below are taken from the Fox ESS H3 Pro Series datasheet (Version 1.6, 2023‑11‑22) for the H3‑Pro‑25.0 model. Always confirm against the latest official documentation before design or installation.

  • Hybrid inverter model: H3‑Pro‑25.0.
  • AC inverter model: AC3‑Pro‑25.0.
  • Rated AC power (H3‑Pro‑25.0): 25000 VA.
  • Max. apparent AC power (H3‑Pro‑25.0): 27500 VA.
  • Max. AC power (series table): 45000 VA.
  • Rated grid voltage (AC voltage range): 400 / 230 V; 380 / 220 V, 3L / N / PE.
  • Rated grid frequency: 50 / 60 Hz, ±5.
  • Max. AC current (per phase): 41.7 A.
  • Power factor: 1 (adjustable from 0.8 leading to 0.8 lagging).
  • Export control: Yes (including “Yes @Max10PCS” parallel operation).
  • THDI: <3 % @ rated power.
  • Battery type: Lithium battery.
  • Battery voltage range: 150 V – 800 V.
  • Full AC load battery voltage: 240 V – 790 V.
  • Max. charge/discharge current: 50 A + 50 A.
  • Number of battery inputs: 2.
  • Battery communication interface: CAN.
  • Max. recommended DC power: 35000 W (series table for H3‑Pro‑25.0).
  • Max. DC voltage: 1000 V (for 1000 V system, maximum operating voltage 950 V; PV input >955 V reports PV overvoltage error).
  • Nominal DC operating voltage: as per MPPT operating window (see MPPT voltage range).
  • Max. input current: 32 A.
  • Max. short‑circuit current: 40 A.
  • MPPT voltage range: 340 V – 850 V.
  • MPPT voltage range (full load): 330 V – 790 V.
  • Start‑up voltage: 150 V (series value).
  • Number of MPPT trackers: 2.
  • Strings per MPPT tracker: 2.
  • Max inverter backfeed current to the array: 0 A.
  • EPS max current (per phase): 37.9 A for 25000 VA EPS rating.
  • Max apparent AC power (EPS): 25000 VA.
  • Peak apparent AC power (60 s, EPS): 30000 VA.
  • THDV: <60 % (EPS output section).
  • MPPT efficiency: 99.90 %.
  • Max. efficiency: 97.80 %.
  • Max. battery‑to‑AC efficiency: 97.60 %.
  • Max. PV‑to‑battery efficiency: 98.10 %.
  • Euro efficiency: 97.40 %.
  • PV reverse polarity protection: Yes.
  • Battery reverse protection: Yes.
  • Anti‑islanding protection: Yes.
  • Output short protection: Yes.
  • Leakage current protection: Yes.
  • Insulation resistor detection: Yes.
  • Over‑voltage category: III (AC side), II (DC side).
  • Reverse connect protection: Yes.
  • Over‑current / over‑temperature protection: Yes.
  • AC/DC surge protection: Type II / Type II.
  • AFCI protection: Optional.
  • DC switch: Optional.
  • String monitoring function: Optional.
  • Dimensions (W × H × D): 600 mm × 560 mm × 225 mm.
  • Packing dimensions (W × H × D): 720 mm × 680 mm × 370 mm.
  • Net weight: 52.5 kg.
  • Gross weight: 57.5 kg.
  • Installation: Wall‑mounted.
  • Operating temperature range: −25 °C to +60 °C (derating at 45 °C).
  • Storage temperature: −40 °C to +70 °C.
  • Noise emission (typical): <60 dB.
  • Storage/operation relative humidity: 0–95 % (without condensation).
  • Altitude: <4000 m.
  • Protective class: I.
  • Ingress protection: IP65 (for outdoor use).
  • Standby consumption: 200 W for hot standby, 18 W for cold standby.
  • Idle mode: Yes.
  • Cooling: Smart FAN cooling.
  • Inverter topology: Non‑isolated.
  • Communication interfaces: Meter, Wi‑Fi, 4G (optional), DRM, USB, BMS (CAN), RS485.
  • LCD display: Backlight 16 × 4 character.
  • Buttons: Capacitive touch sensor × 4.
  • Buzzer: 1, inside (EPS & Earth fault).
  • Parallel operation: Yes, at max 10 PCS.
  • Switch time: 0 ms (EPS output section).
  • Safety standards: EN 62109‑1, EN 62109‑2.
  • EMC standards: IEC 61000‑6‑2, IEC 61000‑6‑3.

Documents available for download

Please review the latest Fox ESS documentation before specifying, installing or commissioning the Fox ESS H3 Pro 25 kW Three‑Phase Hybrid Inverter.

Shipping and availability

We ship the Fox ESS H3 Pro 25 kW Three‑Phase Hybrid Inverter to the UK, Ireland, Africa, the Caribbean and worldwide. If a shipping rate is not shown at checkout, please contact us on +44 2080640335 or info@energian.co.uk for a tailored quote.

UK expert support

Energian provides UK‑based expert support for Fox ESS three‑phase hybrid systems. Get in touch via phone, email or live chat if you need help with sizing, compatibility checks or project design, or if you would like to visit our office for an in‑person consultation.

As this inverter forms part of a wider PV and battery system rather than a plug‑and‑play product, we strongly recommend installation and commissioning via our trusted professional partners or your chosen qualified installer. We can work directly with your contractor to ensure the Fox ESS H3 Pro 25 kW, batteries and protection equipment are configured safely and in line with Fox ESS guidance and local regulations.