Fox ESS T25-G3 25kW Three-Phase String Inverter

Name: Fox ESS T25-G3 25kW Three-Phase String Inverter
SKU: T25-G3
Price: 940.00 GBP
Availability: InStock

£940.00

The Fox ESS T25-G3 25kW three-phase string inverter delivers high-output, high-efficiency conversion for large UK residential and light-commercial photovoltaic systems. With dual MPPT tracking, a broad 140–1000V operating window and up to 98.6% peak efficiency, it sustains strong yield across British conditions — from multi-aspect arrays to days with variable cloud cover.

A rugged 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 T25-G3 offers a clear pathway to future battery adoption within the Fox ecosystem.

Pair with premium solar panels and robust solar mounting. For smaller arrays see the T20-G3.

Contact Evergy for product guidance or system compatibility support.

SKU: T25-G3

Qty:

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

The Fox ESS T25-G3 25kW three-phase string inverter is built for powerful, consistent, and highly efficient conversion across large domestic, commercial, and agricultural solar PV systems. With dual MPPT tracking, a wide 140–1000V operating window, and up to 98.6% peak efficiency, it maximises generation from every panel — even under challenging British weather conditions or multi-aspect roof layouts.

High-Efficiency Performance for British PV Systems

The T25-G3 features two independent MPPT trackers for precise optimisation across split strings or varied orientations, ensuring top-tier yield in real-world conditions. With a low 140V start-up voltage and 1100V maximum DC input, it maintains stable generation through early morning and evening light levels. Its 98.6% peak and ~97.8% Euro efficiency ensure sustained energy conversion, making it a dependable choice for large-scale solar arrays in the UK.

Built for Reliability & Protection

Encased in a weatherproof IP65 aluminium housing, the T25-G3 operates reliably outdoors or in plant-room environments. Fan-free passive cooling delivers quiet operation (~30dB) and minimises maintenance. The inverter includes residual-current and insulation monitoring, Type II surge protection on both DC and AC circuits, and full anti-islanding safeguards. Certified to EN62109 and compliant with G99, it’s ready for safe grid connection throughout the UK.

Key Features

Dual MPPTs with a 140–1000V window for flexible string design and higher yield
Peak efficiency 98.6% / Euro efficiency 97.8% for optimal real-world performance
IP65 weatherproof casing with fan-free, near-silent 30dB operation
Integrated residual-current, insulation, surge and anti-islanding protection
Real-time FoxCloud monitoring via Wi-Fi, LAN or optional 4G
Certified to EN62109 and G99 for full UK compliance

If you’re wondering how the T25-G3 performs under low-light conditions, its wide MPPT voltage range and low 140V start-up ensure consistent generation even during overcast mornings and winter months — ideal for British climates.

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 T25-G3 is engineered for seamless compatibility with advanced solar panels and battery storage systems, enabling highly efficient and scalable energy management for large UK installations. Its high-voltage DC design allows direct coupling with Fox ESS high-voltage LFP batteries, minimising conversion losses and maximising energy yield. With its dual MPPT layout and balanced three-phase output, the T25-G3 performs equally well on commercial rooftops, solar farms, and large domestic systems.

Smart Monitoring & Connectivity

The T25-G3 offers complete real-time visibility through FoxCloud monitoring. Users can view live generation, performance data, and fault diagnostics via web or mobile app, while installers benefit from streamlined setup and firmware management. Standard connectivity includes Wi-Fi and LAN, with optional 4G for remote sites. Communication interfaces such as RS485, CAN and USB provide integration with meters, data loggers, and BMS systems, giving full system oversight across large arrays.

Compact Design & Rugged Construction

Despite its 25kW output, the Fox ESS T25-G3 retains a compact footprint. Measuring approximately 370×480×183.5mm and weighing around 24kg, it can be installed easily by two technicians using standard wall fixings. The IP65-rated aluminium enclosure provides outstanding weather resistance, while passive cooling ensures reliable, near-silent operation (~30dB) without moving parts. This makes it a robust, low-maintenance choice for long-term use in demanding environments.

Installer Guidance & System Notes

String design & MPPT layout

Each MPPT input supports up to approximately 18.2A nominal current across the 140–1000V range. Distribute string lengths evenly across both trackers for balanced voltage and optimised yield across multi-aspect rooftops.

Battery configuration & sizing

For large-scale installations, begin with around 20kWh of Fox high-voltage LFP storage and scale up to 30kWh+ as demand increases — no inverter replacement required.

Grid compliance & safety

The T25-G3 meets EN62109 and G99 standards, including built-in residual-current, insulation, and surge protection to simplify commissioning and long-term compliance.

Why We Recommend the Fox ESS T25-G3

At Evergy, we recommend the T25-G3 for high-capacity projects requiring exceptional reliability, outstanding conversion efficiency, and flexible three-phase power. Its robust IP65 housing, advanced monitoring, and low-maintenance design make it an excellent fit for commercial premises, schools, and agricultural installations. Combined with FoxCloud visibility and strong safety credentials, it’s a dependable, future-ready choice for installers and energy professionals.

Evergy is the renewable division of LAMPS Electrical — an independent UK wholesaler with over 15 years of experience supporting installers nationwide. We supply verified Fox ESS products, full UK warranty, and dedicated after-sales support from our renewables team in Oxfordshire.

Compare in the Fox T Series (G3)

Model	Max PV (W)	Rated AC (W)	MPPTs	MPPT Window (V)	Max Eff.	Dimensions (mm)	Weight (kg)
T20-G3	26000	20000	2	140–1000	98.6%	370×480×183.5	23
T30-G3	32000	30000	2	140–1000	98.6%	370×480×183.5	25

FAQs – Fox ESS T25-G3 Three-Phase String Inverter

How does the T25-G3 differ from the T20-G3?

The T25-G3 delivers a higher 25kW AC output and increased PV input capacity, making it suitable for large commercial systems and multi-roof projects.

Is it compatible with Fox ESS batteries?

Yes — the T25-G3 connects directly to Fox ESS high-voltage LFP batteries, scalable from 20 to 30kWh and beyond for expanded storage.

Can it be installed outdoors?

Yes. The IP65 enclosure and fan-free passive cooling make it ideal for outdoor or plant-room installations in UK climates.

How can I monitor system performance?

Via FoxCloud — standard Wi-Fi/LAN connectivity with optional 4G provides live performance tracking and fault alerts.

What are the inverter’s dimensions and weight?

The T25-G3 measures 370×480×183.5mm and weighs approximately 24kg.

For assistance with specifying or pairing the right inverter for your project, contact Evergy — your trusted UK distributor for professional solar solutions.

Attribute name	Attribute value
Dimensions	Not specified
Weight	Not specified
Warranty	10 Years
Rated Power	25,000 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)

T25-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

Related products

Fox ESS T6-G3 6kW Three-Phase String Inverter

The Fox ESS T6-G3 6kW three-phase string inverter delivers efficient, reliable conversion for compact UK residential and light-commercial photovoltaic systems. With dual MPPT tracking, a wide 140–1000V MPPT window and up to 98.6% peak efficiency, it maximises yield across typical British conditions — from mixed orientations to overcast days.

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.

Pair with quality solar panels and proven solar mounting. If you need more headroom, consider the T8-G3 or step up to the T10-G3.

Contact Evergy for product guidance or system compatibility support.

£586.47

Fox ESS T8-G3 8kW Three-Phase String Inverter

The Fox ESS T8-G3 8kW three-phase string inverter delivers efficient, dependable conversion for UK residential and light-commercial photovoltaic systems. With dual MPPT tracking, a wide 140–1000V MPPT window and up to 98.6% peak efficiency, it maintains strong yield across real-world British conditions, including mixed-orientation arrays and overcast weather.

A rugged IP65 enclosure and fan-free thermal design support quiet, low-maintenance operation indoors or outdoors. Safety features — residual-current and insulation monitoring, anti-islanding and surge protection — help streamline G99 commissioning, while certification to EN62109 underpins electrical safety. Built-in data logging with FoxCloud (Wi-Fi/LAN, optional 4G) gives homeowners and installers clear visibility of generation and system health. The T8-G3 also provides a straightforward pathway to battery adoption within the Fox high-voltage LFP ecosystem when you’re ready.

Pair with quality solar panels and robust solar mounting, or upsize to the T10-G3 if your array grows.

Contact Evergy for product guidance or system compatibility support.

£625.25

Fox ESS T10-G3 10kW Three-Phase String Inverter

The Fox ESS T10-G3 10 kW three-phase string inverter delivers high-efficiency, reliable performance for UK residential and light-commercial photovoltaic systems. With dual MPPT tracking, a broad 140–1000 V operating window and up to 98.6 % conversion efficiency, it maximises solar energy production throughout the day — even under cloud cover or on mixed-orientation roofs.

Its rugged IP65 enclosure and fan-free design ensure quiet, low-maintenance operation indoors or outdoors, while integrated residual-current and insulation monitoring simplify G99 grid compliance. Built-in data logging and FoxCloud connectivity (Wi-Fi/LAN with optional 4 G) provide real-time performance insight for homeowners and installers alike. Certified to EN62109, the T10-G3 is engineered for long-term reliability in British conditions and ready for future battery integration within the Fox ecosystem.

Pair with premium solar panels and durable mounting systems, or step up to the T15-G3 for larger arrays.

Contact Evergy for product guidance or system compatibility support.

£680.00

Fox ESS T15-G3 15kW Three-Phase String Inverter

The Fox ESS T15-G3 15kW 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 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 (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.

Pair with quality solar panels and robust mounting. If your array is smaller, consider the T10-G3; for bigger projects, step up to the T20-G3.

Contact Evergy for product guidance or system compatibility support.

£810.00

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

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.

£890.00