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

Name: Fox ESS T8-G3 8kW Three-Phase String Inverter
SKU: T8-G3
Price: 625.25 GBP
Availability: InStock

£625.25

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.

SKU: T8-G3

Qty:

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

The Fox ESS T8-G3 8kW three-phase string inverter is a compact yet high-performing solution for residential and small commercial solar systems in the UK. With dual MPPT tracking, wide voltage adaptability and 98.6% conversion efficiency, it ensures reliable power output and strong energy yield even under the UK’s variable light conditions.

High-Efficiency Performance for British PV Systems

Engineered for versatility, the T8-G3 features two MPPT trackers operating across a 140–1000V window, allowing flexible string layouts for east–west or partially shaded roofs. Its low 140V start-up voltage enables early generation, while 1100V DC input capacity supports larger arrays. Delivering up to 98.6% peak efficiency and approximately 97.8% Euro efficiency, it converts more of your system’s potential into usable energy throughout the year.

Built for Reliability & Protection

The IP65-rated aluminium housing offers full weather protection for both indoor and outdoor installation. Passive cooling ensures quiet operation at around 30dB, eliminating fan wear and reducing maintenance. Integrated Type II surge protection, residual-current and insulation monitoring, and anti-islanding control safeguard the inverter and system components. The T8-G3 is fully G99 compliant and certified to EN62109, guaranteeing safe grid connection across the UK.

Key Features

Dual MPPTs with 140–1000V range and 99.8% tracking accuracy
Peak efficiency 98.6% / Euro efficiency 97.8% for stable output
IP65 weatherproof design with fan-free, 30dB silent cooling
Comprehensive safety suite: RCM, insulation, surge and anti-islanding
Built-in FoxCloud Wi-Fi/LAN monitoring with optional 4G
Certified to EN62109 and G99 for UK grid connection

If you’re wondering how efficiently the T8-G3 performs under overcast British skies, its wide MPPT voltage window and fast tracking algorithm ensure consistent energy capture even in low irradiance — keeping your system productive all day.

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 T8-G3 integrates effortlessly with solar panels and battery storage systems, providing flexible, high-efficiency performance for three-phase residential and light-commercial setups. Its dual MPPT configuration supports complex roof designs and varying string lengths, ensuring each array operates independently at its optimum output. Direct DC coupling with Fox ESS high-voltage LFP batteries ensures minimal conversion loss, smooth charge control, and simplified scalability as energy demand grows.

Smart Monitoring & Connectivity

With built-in FoxCloud monitoring, users and installers gain real-time visibility of system status, generation, and energy yield. Standard Wi-Fi and LAN connectivity provide convenient access via the FoxCloud app or web portal, while optional 4G ensures consistent connection for remote or off-grid sites. RS485, CAN and USB interfaces enable reliable integration with meters, smart energy devices, and firmware tools — making commissioning fast and dependable.

Compact Design & Rugged Construction

The Fox ESS T8-G3 is designed for simple installation and long-term reliability. Measuring roughly 370×480×183.5mm and weighing about 21kg, it’s lightweight and installer-friendly for wall-mounted setups. The durable IP65 aluminium chassis is corrosion resistant, while natural convection cooling provides near-silent (~30dB) performance with no moving parts — ideal for both indoor and outdoor applications in British weather conditions.

Installer Guidance & System Notes

String design & MPPT layout

Each MPPT supports up to approximately 18.2A input current and operates between 140–1000V. To optimise yield, assign separate roof orientations or equal string lengths to each tracker.

Battery configuration & sizing

For smaller properties or light-commercial systems, start with around 5–10kWh of Fox high-voltage LFP storage and expand as demand grows — fully compatible without inverter modification.

Grid compliance & safety

Fully certified to EN62109 and compliant with G99. Includes built-in residual-current, insulation and surge protection to simplify UK grid connection and commissioning.

Why We Recommend the Fox ESS T8-G3

At Evergy, we recommend the T8-G3 as a robust and efficient choice for mid-sized three-phase systems. Its compact design, silent operation and flexible MPPT control make it ideal for installers who value straightforward setup, reliability, and long-term system stability. With FoxCloud connectivity, ongoing monitoring and support are effortless — ensuring performance you can trust for years to come.

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

Compare in the Fox T Series (G3)

Model	Max PV (W)	Rated AC (W)	MPPTs	MPPT Window (V)	Max Eff.	Dimensions (mm)	Weight (kg)
T6-G3	9000	6000	2	140–1000	98.6%	370×480×183.5	20
T10-G3	15000	10000	2	140–1000	98.6%	370×480×183.5	21

FAQs – Fox ESS T8-G3 Three-Phase String Inverter

How does the T8-G3 differ from the T6-G3?

The T8-G3 provides an 8kW AC output with greater PV input capacity, making it ideal for slightly larger three-phase arrays than the T6-G3.

Is it compatible with Fox ESS batteries?

Yes — it supports Fox ESS high-voltage LFP batteries, scalable from 5 to 15kWh for additional storage flexibility.

Can it be installed outdoors?

Yes. The IP65 aluminium housing and passive cooling system make it suitable for outdoor installation in the UK climate.

How can I monitor the system?

Through FoxCloud monitoring, available via mobile app or browser. Wi-Fi and LAN are standard with optional 4G connectivity.

What are the inverter’s dimensions and weight?

The T8-G3 measures 370×480×183.5mm and weighs approximately 21kg.

For technical support or system design advice, contact Evergy — trusted UK supplier of professional solar components.

Attribute name	Attribute value
Dimensions	Not specified
Weight	Not specified
Warranty	10 Years
Rated Power	8,000 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)

T8-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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Contact Evergy for product guidance or system compatibility support.

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Contact Evergy for product guidance or system compatibility support.

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