Fox ESS H3-PRO-20.0 20kW Three-Phase Hybrid Inverter

£1940.87

Fox ESS H3-PRO-20.0 is a high-power three-phase hybrid inverter engineered for larger UK homes and light-commercial systems that demand stable, battery-ready output. With three MPPT trackers and a wide 150 – 850 V window (full-load 230 – 850 V), it extracts maximum generation from complex or multi-aspect arrays, even under cloudy British skies. Peak efficiency reaches 97.8 % with 99.9 % MPPT accuracy, while IP65 weather protection and smart-fan cooling ensure long-term reliability outdoors or in plant rooms.

Designed for Fox’s high-voltage LFP storage, the H3-PRO-20.0 offers two battery inputs (50 A + 50 A) for fast DC-coupled charging and scalable capacity. Integrated Wi-Fi / LAN (plus optional 4 G) and ports for RS485, CAN, DRM and USB enable rapid commissioning through FoxCloud. Certified to EN 62109-1 / -2 and EMC IEC 61000-6-2 / -6-3, it meets UK G99 connection requirements. Dimensions 600 × 560 × 225 mm; weight ≈ 52.5 kg.

Contact Evergy for product guidance or system compatibility support.

SKU: H3-PRO-20.0

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The Fox ESS H3-PRO-20.0 is a three-phase hybrid inverter designed to deliver high efficiency, robust reliability, and battery-ready flexibility for larger UK homes and light-commercial installations. With its expanded power class and advanced communication suite, it provides consistent generation, easy monitoring, and trusted Fox ESS build quality. Specification data verified from Fox ESS H3 PRO datasheet (v2.1 – November 2024).

High-Efficiency Performance for British PV Systems

Equipped with three MPPT trackers operating across a 150 – 850 V range (230 – 850 V at full load), the H3-PRO-20.0 maximises output on multi-orientation or shaded roofs. Each tracker independently optimises string performance, achieving 97.8 % peak efficiency and 99.9 % MPPT accuracy. The inverter sustains steady generation even during low-irradiance mornings and overcast British weather, converting more solar power into usable energy year-round.

Built for Reliability & Protection

A durable IP65-rated aluminium enclosure safeguards electronics from dust and rain, while adaptive fan cooling maintains thermal stability under continuous high load. Integrated surge arrestors (Type II AC / Type II DC), residual-current and insulation monitoring, and anti-islanding protection ensure complete electrical safety. The inverter is certified to EN 62109-1 / -2 and EMC IEC 61000-6-2 / -6-3, making it fully compliant for G99 grid-connected systems in the UK.

Key Features

Three independent MPPTs with 150 – 850 V window (230 – 850 V full load).
Peak efficiency 97.8 % / MPPT tracking accuracy 99.9 %.
IP65 construction with smart-fan cooling for extended life.
Dual battery inputs (50 A + 50 A) for high-voltage LFP storage.
Integrated Wi-Fi & LAN with optional 4 G connectivity via FoxCloud.
Comprehensive protection suite — surge, RCM, insulation and anti-islanding.

If you’re wondering how the H3-PRO-20.0 performs in typical UK conditions, its wide MPPT window and fast tracking algorithm keep strings operating close to their optimum point through variable light levels and cloudy skies — delivering consistent generation when less advanced inverters begin to drop off.

Specification data verified from Fox ESS H3 PRO documentation (v2.1 – November 2024).

Seamless Integration with Solar Panels & Battery Storage

The Fox ESS H3-PRO-20.0 integrates directly with high-voltage LFP batteries and modern solar panels to create a unified energy system. Its dual battery inputs (50 A + 50 A) support fast DC-coupled charging and scalable capacity, allowing expansion from single-family homes to light-commercial installations without an inverter upgrade. Direct DC coupling reduces conversion losses and speeds response, delivering greater usable energy when sunlight is limited.

Smart Monitoring & Connectivity

Through FoxCloud, installers and users can monitor real-time generation, consumption, and storage performance from anywhere. Built-in Wi-Fi & LAN are standard, with optional 4 G for remote locations. Communication ports—RS485, CAN, DRM, meter, and USB—ensure seamless integration with Fox batteries, smart meters, and building-energy management systems. Automatic fault logging and firmware update capability help maintain long-term reliability and minimise call-backs.

Compact Design & Rugged Construction

Despite its 20 kW output, the H3-PRO-20.0 remains compact at 600 × 560 × 225 mm and approximately 52.5 kg. A robust IP65 enclosure and intelligent fan cooling protect internal components against moisture, dust, and temperature extremes. Typical noise levels remain below 60 dB, making it suitable for plant rooms or sheltered outdoor installations where space and acoustic comfort matter.

Installer Guidance & System Notes

String design & MPPT layout

Utilise all three MPPTs to separate orientations or differing tilt angles. Keep each string within the 150 – 850 V window (230 – 850 V at full load) and respect the input-current limits defined in the manufacturer datasheet.

Battery configuration & sizing

Two HV LFP battery inputs allow parallel stacks for faster charge/discharge. Start with storage aligned to daily kWh consumption and expand as usage grows — the inverter’s dual 50 A inputs provide the headroom required.

Grid compliance & safety

Certified to EN 62109-1 / -2 with integrated RCM, insulation monitoring, anti-islanding logic, and Type II AC / DC surge protection. Suitable for UK G99 applications subject to DNO approval.

Why We Recommend the Fox ESS H3-PRO-20.0

At Evergy, we recommend the H3-PRO-20.0 for projects that demand high-capacity three-phase performance and seamless hybrid control. Its 3× MPPT design, IP65 build quality, and FoxCloud monitoring combine installer practicality with dependable day-to-day efficiency. Whether powering a large home, farm building, or small commercial site, this inverter delivers professional-grade reliability backed by Fox ESS engineering.

Evergy is the renewable-energy division of LAMPS Electrical — an independent UK wholesaler with over 15 years’ experience supplying market leading products and supporting installers nationwide.

Compare in the Fox H3 PRO Range

Model	Rated AC (W)	MPPTs	MPPT Window (V)	Max Eff.	Dimensions (mm)	Weight (kg)
H3-PRO-15.0	15 000	3	150 – 850 (full-load 170 – 850)	97.8 %	600 × 560 × 225	≈ 52.5
H3-PRO-20.0	20 000	3	150 – 850 (full-load 230 – 850)	97.8 %	600 × 560 × 225	≈ 52.5

Figures derived from the Fox ESS H3 PRO datasheet (v2.1 – Nov 2024); confirm exact limits for final system design.

FAQs – Fox ESS H3-PRO-20.0

How does H3-PRO-20.0 differ from H3-PRO-15.0?

The 20 kW version offers higher AC output and PV input capacity, ideal for larger arrays or light-commercial installations requiring three-phase stability.

Is it compatible with Fox high-voltage LFP batteries?

Yes — it supports dual HV LFP inputs for fast DC-coupled charging up to 50 A per channel, ensuring rapid charge/discharge cycles.

Can it be mounted outdoors?

Yes. The inverter’s IP65 enclosure and controlled cooling make it suitable for outdoor use in typical British conditions.

How is system performance monitored?

Monitoring is handled via FoxCloud through built-in Wi-Fi or LAN, with optional 4 G modules for remote sites without broadband access.

What are the dimensions & weight?

The unit measures 600 × 560 × 225 mm and weighs approximately 52.5 kg.

For expert guidance on system design or compatibility, contact Evergy — trusted UK distributor of premium solar brands and official Fox ESS partner.

Attribute name	Attribute value
Dimensions	600 x 560 x 225 mm
Weight	57.5 kg
Warranty	10 Years
Rated Power	20,000 W
MPPT Quantity	3
DC Start-up Voltage	160 V
Protection Class	IP65 (Outdoor Use)
Integrated DC Switch	Yes

H3-PRO-20.0

FOX ESS

Fox ESS is a global leader in the development of inverter and energy storage solutions. Engineered by some of the world’s leading inverter and battery experts, their products offer advanced features, coupled with exceptional performance and reliability.

Free delivery -

NEXT DAY Delivery to Oxfordshire, Buckinghamshire and London via an EVERGY vehicle. Max of 1 ton weight.

Other delivery options via courier -

FREE NEXT DAY (*orders over £50, some batteries and inverters will require an additional fee) via FEDEX. Monday to Friday, up to 30kg, Max box size 50cm x 50cm x 50cm (volume). Orders must be received by 2pm.

Anytime NEXT DAY delivery – under £50 = £6.50 (depending on location, weight and size)

Regardless of spend, additional to any of the above charges –

Before noon (FedEx Priority Express) = Guide Price £15.00 (calulated at checkout)

Before 10am (FedEx First) = Guide Price £20.00 (calulated at checkout)

Delivery of pallets -

Palletised deliveries – Prices starting at £58

Multiple pallet orders can be quoted upon request (price dependent on number of pallets and postcode area)

Special delivery items may vary (non-stock products).

SAME DAY COLLECTION - Click & collect from Evergy Stores (Thame, Oxfordshire).

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