Fox ESS T20-G3 20kW Three-Phase String Inverter

Name: Fox ESS T20-G3 20kW Three-Phase String Inverter
SKU: T20-G3
Price: 890.00 GBP
Availability: InStock

£890.00

The Fox ESS T20-G3 20kW three-phase string inverter delivers high-output, high-efficiency conversion for larger UK residential and light-commercial photovoltaic systems. With dual MPPT tracking, a wide 140–1000V operating window and up to 98.6% peak efficiency, it maintains strong yield across British conditions, from mixed-orientation roofs to days with intermittent cloud cover.

A durable IP65 enclosure and fan-free thermal design support quiet, low-maintenance operation indoors or outdoors. Integrated residual-current and insulation monitoring, anti-islanding and surge protection help streamline G99 commissioning, while certification to EN62109 underpins safety. Built-in data logging with FoxCloud monitoring (Wi-Fi/LAN, optional 4G) provides real-time insight for owners and installers, and the T20-G3 offers a clear pathway to future battery adoption within the Fox ecosystem.

Pair with premium solar panels and robust mounting. For smaller arrays see the T15-G3; for larger projects step up to the T25-G3.

Contact Evergy for product guidance or system compatibility support.

SKU: T20-G3

Qty:

Free and easy returns | Easy to Install | Professional Installers Available

The Fox ESS T20-G3 20kW three-phase string inverter delivers powerful, high-efficiency energy conversion for large-scale residential and light-commercial solar PV systems in the UK. Combining dual MPPT tracking with a broad 140–1000V input window, it ensures consistent power generation across variable weather and complex array layouts, achieving up to 98.6% maximum efficiency.

High-Efficiency Performance for British PV Systems

Designed for performance in real-world British conditions, the T20-G3 offers two independent MPPT trackers capable of handling mixed roof aspects or multi-string commercial configurations. With a low 140V start-up voltage and maximum DC voltage of 1100V, the inverter maintains excellent conversion efficiency through morning and evening low-light periods. Its 98.6% peak and approximately 97.8% Euro efficiency ensure optimal returns from every installed panel, making it a dependable choice for larger installations across the UK.

Built for Reliability & Protection

A robust IP65-rated enclosure shields the T20-G3 against dust and rain, enabling flexible outdoor or indoor placement. Fan-free passive cooling keeps acoustic output to around 30dB and minimises servicing requirements. Safety features include residual-current and insulation monitoring, anti-islanding control, and Type II surge protection for both DC and AC circuits. Certified to EN62109 and compliant with G99, it’s ready for safe grid connection anywhere in the UK.

Key Features

Dual MPPT inputs with a 140–1000V window and up to 99.8% tracking accuracy
Peak efficiency 98.6% / Euro efficiency 97.8% for large-scale UK systems
IP65 aluminium housing with fan-free cooling (≈30dB operation)
Comprehensive protection suite: RCM, insulation monitoring, surge and anti-islanding
FoxCloud monitoring with Wi-Fi/LAN and optional 4G connectivity
Certified to EN62109 and G99 for full UK grid compliance

If you’re wondering how well the T20-G3 performs under the UK’s typical overcast conditions, its dual MPPT configuration and low start-up voltage keep the system generating consistently — maximising yield even on dull, cloudy days.

Specification data verified from Fox ESS T Series (G3) documentation (version 1.1, 2021-11-19).

Seamless Integration with Solar Panels & Battery Storage

The Fox ESS T20-G3 integrates seamlessly with modern solar panels and battery storage systems. Its high-voltage DC coupling allows efficient communication with Fox ESS LFP battery technology, reducing conversion losses and simplifying system design. With its robust three-phase output and precise dual MPPT control, it supports balanced performance across multiple strings, ideal for small commercial premises, agricultural sites, and larger domestic systems seeking to reduce grid reliance.

Smart Monitoring & Communication

Equipped with FoxCloud monitoring, the T20-G3 provides complete visibility over solar generation, performance trends, and system health. Built-in Wi-Fi and LAN come as standard, while optional 4G connectivity ensures reliable operation in rural or remote installations. Communication ports including RS485, CAN and USB interfaces allow flexible integration with meters, BMS systems, and firmware update tools — supporting installers during setup and long-term maintenance.

Compact Design & Rugged Construction

The Fox ESS T20-G3 combines high power density with installation flexibility. Measuring approximately 370×480×183.5mm and weighing around 23kg, it’s compact enough for single-person handling while providing exceptional output for its size. The IP65-rated aluminium enclosure resists corrosion and weather exposure, while natural convection cooling ensures near-silent operation (~30dB) with minimal service requirements.

Installer Guidance & System Notes

String design & MPPT layout

Each tracker supports up to approximately 18.2A input current with a 140–1000V range. When designing arrays, distribute strings evenly across both MPPTs to optimise performance and mitigate shade or orientation differences.

Battery configuration & sizing

For large homes or commercial properties, begin with around 15–20kWh of Fox high-voltage LFP storage and expand modularly as consumption grows — no inverter upgrade required.

Grid compliance & safety

The T20-G3 is certified to EN62109 and compliant with G99. It includes residual-current monitoring, insulation detection and surge protection for safe UK grid connection.

Why We Recommend the Fox ESS T20-G3

At Evergy, we recommend the T20-G3 for its excellent efficiency, scalable capacity and durable IP65 build suited to the British climate. Its dual MPPT architecture and intuitive FoxCloud monitoring make it a reliable choice for installers handling large three-phase systems where dependable uptime and remote visibility are essential.

Evergy is the renewable division of LAMPS Electrical — an independent UK wholesaler with over 15 years of trade expertise supporting installers nationwide. We supply verified Fox ESS stock, UK-based technical support and reliable delivery direct to site.

Compare in the Fox T Series (G3)

Model	Max PV (W)	Rated AC (W)	MPPTs	MPPT Window (V)	Max Eff.	Dimensions (mm)	Weight (kg)
T15-G3	19500	15000	2	140–1000	98.6%	370×480×183.5	22
T25-G3	26000	25000	2	140–1000	98.6%	370×480×183.5	24

FAQs – Fox ESS T20-G3 Three-Phase String Inverter

How does the T20-G3 differ from the T15-G3?

The T20-G3 offers a higher 20kW AC output and greater PV input capacity, making it ideal for larger commercial arrays and high-demand properties.

Is it compatible with Fox ESS batteries?

Yes — it supports Fox ESS high-voltage LFP batteries, scalable from 15 to 25kWh depending on system size.

Can it be installed outdoors?

Yes. Its IP65-rated aluminium casing and passive cooling system make it suitable for external or plant-room mounting.

How can I monitor generation and performance?

Through FoxCloud — accessible via app or browser with standard Wi-Fi/LAN or optional 4G connectivity.

What are the inverter’s dimensions and weight?

The T20-G3 measures 370×480×183.5mm and weighs around 23kg.

For expert guidance on specifying or pairing the right inverter for your solar project, contact Evergy — trusted UK distributor of leading solar technologies.

Attribute name	Attribute value
Dimensions	Not specified
Weight	Not specified
Warranty	10 Years
Rated Power	20,000 W
Max Efficiency	98.6%
Max Input Voltage	1,100 V
MPPT Quantity	2
DC Start-up Voltage	140 V
Protection Class	IP65 (Outdoor Use)

T20-G3

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).

Products

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A robust IP65 enclosure and fan-free thermal design enable quiet, low-maintenance operation indoors or outdoors. Safety features include residual-current and insulation monitoring, anti-islanding and surge protection to support G99 grid compliance, while certification to EN62109 underpins electrical safety. Built-in data logging with FoxCloud (Wi-Fi/LAN, optional 4G) provides clear visibility for homeowners and installers, and the T6-G3 integrates naturally with the wider Fox ecosystem when you plan future storage.

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A durable IP65 enclosure and fan-free thermal design support quiet, low-maintenance operation indoors or outdoors. Integrated residual-current and insulation monitoring, anti-islanding and surge protection help streamline G99 commissioning, while certification to EN62109 underpins safety. Built-in data logging with FoxCloud (Wi-Fi/LAN, optional 4G) provides real-time insight for homeowners and installers, and the T15-G3 offers a straightforward pathway to future battery adoption within the Fox ecosystem.

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Contact Evergy for product guidance or system compatibility support.

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