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

Name: Fox ESS T15-G3 15kW Three-Phase String Inverter
SKU: T15-G3
Price: 810.00 GBP
Availability: InStock

£810.00

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.

SKU: T15-G3

Qty:

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

The Fox ESS T15-G3 15kW three-phase string inverter provides powerful, stable, and efficient conversion for larger residential and light-commercial solar PV systems in the UK. Built with advanced dual MPPT tracking and a wide 140–1000V operating window, it delivers high yield across real-world British conditions — from cloudy skies to multi-orientation rooftops — while maintaining up to 98.6% peak efficiency.

High-Efficiency Performance for British PV Systems

Two independent MPPT trackers enable precise optimisation across split arrays or varying roof pitches, making it ideal for properties with east–west or complex layouts. The 1100V DC input and 140V low start-up voltage ensure the system starts generating early in the day and continues through lower light levels. With 98.6% maximum efficiency and approximately 97.8% Euro efficiency, the T15-G3 delivers strong, consistent energy output even under the UK’s variable sunlight conditions.

Built for Reliability & Protection

Engineered for long-term resilience, the IP65-rated aluminium housing protects the inverter from dust and rain, allowing flexible indoor or outdoor installation. Passive cooling ensures near-silent operation around 30dB while reducing maintenance demands. The integrated protection suite includes residual-current and insulation monitoring, DC and AC surge protection (Type II), and comprehensive anti-islanding control. Certified to EN62109 and fully compliant with G99, it’s ready for safe grid connection throughout 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 optimal real-world performance
IP65 weatherproof, fan-free design for quiet outdoor installation
Comprehensive protection: RCM, insulation, Type II surge, and anti-islanding
FoxCloud monitoring with Wi-Fi/LAN and optional 4G connectivity
Certified to EN62109 and G99 for UK compliance

If you’re wondering how efficiently the T15-G3 performs during overcast British weather, its wide MPPT range and fast response allow continuous power generation even under low-irradiance conditions that would halt lesser inverters.

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 T15-G3 connects seamlessly with modern solar panels and battery storage systems, providing the flexibility required for scalable commercial or high-capacity domestic installations. Using high-voltage DC coupling, the T15-G3 can link directly to Fox ESS LFP batteries, allowing smooth energy storage with minimal conversion loss. Its dual MPPT configuration supports complex system layouts, maintaining balanced performance even when arrays face multiple roof orientations.

Smart Monitoring & Communication

Equipped with FoxCloud monitoring as standard, the T15-G3 offers detailed system visibility for homeowners and installers alike. Real-time data tracking, fault notifications and historical performance charts help optimise long-term efficiency. Built-in Wi-Fi and LAN connections come as standard, while optional 4G ensures reliable access at remote sites. Communication ports including RS485 and USB simplify integration with third-party meters, battery systems and monitoring software.

Compact Design & Rugged Construction

Despite its high output, the Fox ESS T15-G3 maintains a compact, installer-friendly footprint. Measuring approximately 370×480×183.5mm and weighing around 22kg, it’s designed for straightforward wall mounting in outdoor or indoor plant areas. The IP65 aluminium enclosure provides robust weather protection, while passive cooling technology ensures quiet operation (≈30dB) without mechanical wear parts.

Installer Guidance & System Notes

String design & MPPT layout

Each MPPT input supports around 18.2A nominal current, with a wide 140–1000V tracking range. For maximum yield, assign each tracker to a separate orientation and balance string lengths to avoid mismatch losses.

Battery configuration & sizing

Start with approximately 10–15kWh of Fox high-voltage LFP storage for daily cycling and expand to 20kWh+ as usage grows — all without upgrading the inverter.

Grid compliance & safety

Certified to EN62109 and compliant with G99. Includes residual-current and insulation monitoring, anti-islanding logic and Type II surge protection for safe UK grid connection.

Why We Recommend the Fox ESS T15-G3

At Evergy, we recommend the T15-G3 for its balance of high power output, exceptional efficiency and durable IP65 design. It’s an excellent choice for larger three-phase arrays or mixed-roof installations where reliability and monitoring transparency are key. With intuitive FoxCloud control and proven long-term stability, it offers excellent return on investment for installers and property owners alike.

Evergy is the renewable division of LAMPS Electrical — an independent UK wholesaler with over 15 years’ experience supporting solar professionals nationwide. We supply genuine Fox ESS equipment with full UK warranty and after-sales assistance 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)
T10-G3	15000	10000	2	140–1000	98.6%	370×480×183.5	21
T20-G3	19500	20000	2	140–1000	98.6%	370×480×183.5	23

FAQs – Fox ESS T15-G3 Three-Phase String Inverter

How does the T15-G3 differ from the T10-G3?

The T15-G3 increases rated output to 15kW and allows higher PV input capacity, making it suitable for larger commercial or multi-string systems.

Is it compatible with Fox ESS batteries?

Yes — it integrates with Fox ESS high-voltage LFP batteries, scalable from 10 to 20 kWh + for extended storage flexibility.

Can it be installed outdoors?

Yes — its IP65 aluminium enclosure and passive cooling make it ideal for outdoor or plant-room installation.

How do I monitor performance?

Through FoxCloud monitoring via mobile app or browser — Wi-Fi and LAN are standard, with optional 4G for remote sites.

What are the inverter’s dimensions and weight?

The T15-G3 measures 370×480×183.5 mm and weighs approximately 22 kg.

For expert advice on system design or specifying the right inverter for your project, contact Evergy — trusted UK distributor of leading solar brands.

Attribute name	Attribute value
Dimensions	Not specified
Weight	Not specified
Warranty	10 Years
Rated Power	15,000 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)

T15-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).

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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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