Fox ESS R75 75 kW Three-Phase Commercial Solar Inverter

The Fox ESS R75 75 kW Three-Phase Commercial Solar Inverter delivers dependable, high-efficiency power conversion for mid-scale commercial and industrial PV installations across the UK. Positioned within Fox’s advanced R-Series, it combines proven field reliability with refined electronic design, supporting efficient solar generation for warehouses, agricultural sites, and business estates seeking long-term value.

High-Efficiency Performance for Commercial PV Systems

Designed to maximise solar harvest under the UK’s variable light conditions, the R75 offers triple MPPT control to manage up to three independent string configurations. Its wide MPPT voltage range of 200 – 1 000 V allows optimal tracking even with varied panel orientations or partial shading. With a maximum efficiency of 98.7 % and 98.4 % Euro efficiency, the R75 ensures minimal energy loss from DC to AC conversion — a crucial advantage for commercial users monitoring return on investment.

The inverter’s reactive power management and export limitation functions support flexible grid compliance under G99 standards, making it a suitable choice for DNO-approved systems throughout the UK. Internal high-speed processors maintain consistent MPPT response across changing light levels, ensuring strong yields throughout the year.

Built for Reliability & Protection

Fox ESS engineers its R-Series to meet the highest reliability expectations for commercial operation. The IP65-rated weatherproof enclosure ensures dependable outdoor performance in British conditions, while integrated Type II surge protection (DC and AC) defends against transient voltage spikes. Internal residual-current monitoring and insulation resistance detection enhance safety, simplifying commissioning and ongoing compliance checks.

With fanless, natural convection cooling, the R75 operates quietly and efficiently — ideal for installations near workspaces or education sites. Its robust design is certified to EN 62109, ensuring both electrical and thermal safety across all operational environments.

Key Features

• Triple MPPT design for multi-string array optimisation
• 98.7 % peak efficiency / 98.4 % Euro efficiency
• IP65 casing for indoor or outdoor installation
• Integrated surge and insulation monitoring protection
• Quiet, fan-free operation for commercial use
• Smart FoxCloud monitoring with Wi-Fi, LAN, or optional 4G

If you’re wondering how efficiently the R75 performs under cloud cover or during low irradiance typical of UK weather, its advanced MPPT tracking system maintains consistent output by dynamically adjusting voltage to suit real-time solar conditions — ensuring maximum return even on overcast days.

Specification data verified from Fox ESS R-Series documentation (v1.2, 2024).

Seamless Integration with Solar Panels & Battery Storage

The Fox ESS R75 75 kW Three-Phase Commercial Solar Inverter integrates seamlessly with solar panels and high-voltage LFP battery systems, enabling flexible design for medium to large-scale commercial projects. Supporting DC input currents up to 32 A per MPPT, it’s compatible with today’s high-output modules and allows parallel inverter configuration for scalable generation capacity.

Fox’s proprietary energy management system provides intelligent coordination between generation, storage, and grid export. The R75 enables precise energy balancing, supporting commercial sites that require on-site self-consumption, export limitation, or future battery expansion.

Smart Monitoring & Connectivity

Integrated FoxCloud connectivity gives real-time visibility of energy production, consumption, and system health. Built-in Wi-Fi and LAN interfaces allow secure data access, while RS485, CAN, and USB ports ensure smooth integration with battery management systems and smart meters. For off-grid or remote installations, an optional 4G module offers dependable connectivity wherever required.

The R75 also includes internal data logging and automatic fault detection, giving installers and asset managers remote access to alerts and performance reports. Firmware updates and system configuration can be completed via FoxCloud, reducing on-site maintenance and downtime.

Compact Design & Rugged Construction

The Fox ESS R75 is built with practicality in mind. Measuring approximately 955 × 700 × 350 mm and weighing 74 kg, it’s easy to mount on exterior walls or within plant rooms. The IP65 aluminium housing protects the inverter from dust, humidity, and rain, while the fanless design ensures quiet operation (below 30 dB) — ideal for educational, office, and public environments.

Installer Guidance & System Notes

Why We Recommend the Fox ESS R75 75 kW Inverter

At Evergy, we recommend the R75 for medium-sized commercial projects requiring a balance of power, reliability, and simplicity. Its triple MPPT architecture, high conversion efficiency, and smart FoxCloud connectivity make it one of the most versatile commercial inverters in its class.

Evergy is the renewable division of LAMPS Electrical — an independent UK wholesaler with more than 15 years of experience supporting professional solar installers nationwide. We supply genuine Fox ESS products with full UK warranty coverage and dedicated technical assistance from our Oxfordshire-based renewables team.

Choose the R75 for dependable commercial-scale performance, intelligent integration, and lasting build quality trusted by UK installers.

Compare in the Fox ESS R-Series Range

FAQs – Fox ESS R75 75 kW Three-Phase Commercial Solar Inverter

For product advice, compatibility checks, or system design support, contact Evergy — the UK’s trusted distributor of Fox ESS inverters and renewable components.