Fox ESS S2500-G2 2.5kW Single-Phase String Inverter

£232.00

Fox ESS S2500-G2 2.5kW Single-Phase String Inverter delivers extra headroom for compact UK arrays that need dependable output without adding system complexity. A single high-accuracy MPPT, wide DC operating window and low start-up voltage keep generation flowing through early mornings and cloudy British weather. The fan-free, IP65 enclosure supports quiet, outdoor-ready mounting and reduced maintenance.

Built for tidy commissioning, the S2500-G2 includes onboard data logging and FoxCloud remote monitoring (Wi-Fi/LAN, optional 4G) for real-time performance checks and efficient support. Certified to G99 and EN62109, it integrates cleanly with UK single-phase supplies. Headline figures include 2500W AC output, up to 3750W max PV input, single MPPT, and peak efficiency up to 97.6% (confirm exact limits in the datasheet). Compare adjacent sizes: step down to the S2000-G2 or upsize to the S3000-G2. Browse compatible solar panels and battery storage.

Contact Evergy for product guidance or system compatibility support.

SKU: S2500-G2

Qty:

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

The Fox ESS S2500-G2 2.5kW Single-Phase String Inverter gives UK installers practical headroom for compact arrays while keeping commissioning fast and predictable. It’s built for single-string domestic or light-commercial systems where quiet running, tidy cabling and straightforward G99 sign-off matter.

Smart Hybrid Power for UK Homes and Installers

Centred on a high-accuracy single MPPT, the S2500-G2 supports up to 3750W PV input across a wide 80–500V operating window with low start-up around 60V. That combination sustains generation through cloudy spells and long shoulder hours typical of British weather. The fan-free IP65 enclosure simplifies external mounting, keeps acoustics below 25dB and removes moving parts that add maintenance. Integrated data logging and FoxCloud connectivity (Wi-Fi/LAN, optional 4G) make on-site verification and handover quick and tidy.

Installer-Ready Safety & Compliance

Safety and conformity are built in: anti-islanding, residual-current and insulation monitoring accelerate UK G99 commissioning, while certification to EN62109 underpins electrical and thermal safety for long service life. Clear status indicators aid first-fix checks, and remote diagnostics via FoxCloud help reduce call-backs and repeat visits.

Key Installer Features

Single MPPT with rapid tracking across 80–500V for stable yield
2500W rated AC output; up to 3750W max PV input
Fan-free IP65 construction for quiet, outdoor-ready mounting (<25dB)
FoxCloud monitoring via Wi-Fi/LAN; optional 4G for remote sites
Integrated RCM, insulation monitoring and anti-islanding for faster G99 sign-off
Compact, lightweight chassis to reduce wall-space and handling time

If you’re wondering how the S2500-G2 behaves with short or single-aspect strings, its precise MPPT tracking and low start-up voltage help maintain yield when irradiance is uneven—supporting predictable output on typical UK roof layouts without stepping up to a multi-MPPT platform.

Specification data verified from Fox ESS S(G2) documentation (V3.4, April 2025).

Smart Monitoring & Installer-Grade Connectivity

The Fox ESS S2500-G2 provides professional-grade visibility for installers and homeowners through FoxCloud. Standard Wi-Fi and LAN ports enable direct setup and long-term remote monitoring, while an optional 4 G dongle supports rural or network-limited sites. Local data logging ensures accurate performance records for commissioning and service support. RS485 and CAN interfaces are included for simple BMS, export-limiting and smart-meter communication.

Seamless Integration with Solar Panels & Battery Systems

The S2500-G2 integrates easily with solar panels across all leading brands, ideal for single-phase domestic arrays. Its hybrid-ready platform supports direct communication with Fox high-voltage LFP batteries when connected through compatible controllers, enabling system upgrades without the need for inverter replacement. This future-ready approach gives UK installers flexibility for customers planning storage later on.

Compact Design & Rugged Construction

At just 5.4kg and 290×220×116mm, the S2500-G2 offers exceptional power density in a small footprint. Its fan-less IP65 enclosure allows silent operation (<25dB) and long-term durability even in exposed outdoor locations. The anodised aluminium housing resists corrosion and simplifies cable management during installation, cutting both time and material costs.

Installer Guidance & System Notes

String design & MPPT layout

Maintain the 80–500V DC window and limit input current to 12.5A. The inverter’s single MPPT ensures optimal tracking across uniform string designs and delivers stable output even under cloud cover.

Battery configuration & sizing

When used with a compatible Fox controller, start with around 5–10kWh of LFP storage for domestic applications, scaling up as demand increases. The S2500-G2 communicates directly for charge control and battery diagnostics.

Grid compliance & safety

Fully certified to G99 and EN62109. Integrated anti-islanding, residual-current and insulation monitoring ensure a safe, compliant installation ready for UK grid connection.

Why We Recommend the Fox ESS S2500-G2

At Evergy, we recommend the S2500-G2 for installers who want strong mid-range performance in a compact single-phase design. Its robust IP65 casing, efficient MPPT tracking and FoxCloud connectivity make it a dependable upgrade over smaller S-Series models. Evergy—part of LAMPS Electrical, an independent UK wholesaler with over 15 years of trade experience—provides genuine Fox ESS stock, warranty support and professional advice for UK solar specialists.

Compare in the Fox S(G2) Range

Model	Max PV (W)	Rated AC (W)	MPPTs	Voltage Window (V)	Max Eff.	Dimensions (mm)	Weight (kg)
S2000-G2	3000	2000	1	80–500	97.6%	290×220×116	5.4
S3000-G2	4500	3000	1	80–500	97.6%	290×220×116	5.4

FAQs – Fox ESS S2500-G2 2.5kW Single-Phase String Inverter

How does the S2500-G2 differ from the S2000-G2?

The S2500-G2 delivers higher 2500W AC output and supports up to 3750W PV input, providing more power headroom for mid-sized domestic arrays.

Is it compatible with Fox ESS batteries?

Yes — it integrates seamlessly with Fox high-voltage LFP batteries through compatible controllers for future hybrid upgrades.

Can it be installed outdoors?

Yes. The IP65 aluminium enclosure and fan-free cooling system make it fully weather-resistant and quiet for outdoor mounting.

How can I monitor system performance?

Via FoxCloud, which offers real-time Wi-Fi/LAN monitoring and optional 4G access for remote sites.

What are the size and weight?

Approx. 290×220×116mm and 5.4kg, allowing single-person installation on most wall surfaces.

For system compatibility or trade support, contact Evergy — your trusted UK supplier for Fox ESS and other market-leading inverter brands.

Attribute name	Attribute value
Dimensions	29 x 22 x 11.6 cm
Weight	5.4 kg
Warranty	10 Years
Rated Power	2,500 W
Max Efficiency	97.4%
MPPT Quantity	1
DC Start-up Voltage	60 V
Protection Class	IP65 (Outdoor Use)

S2500-G2

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).