Fox ESS KH7 7kW Single Phase Hybrid Inverter

The Fox ESS KH7 7 kW Single Phase Hybrid Inverter delivers dependable, high-efficiency solar conversion for residential and small commercial systems across the UK. As part of Fox’s renowned K-Series range, it combines advanced dual MPPT tracking with quiet, fan-free operation to maximise generation in all British conditions. Designed for installers and system designers alike, it provides a versatile, battery-ready foundation for smart energy management.

High-Efficiency Performance for British PV Systems

With a broad MPPT voltage window of 80 – 500 V and a low start-up threshold of 75 V, the KH7 captures more solar yield from morning through to dusk. It achieves up to 97.8 % peak efficiency and 97.4 % Euro efficiency, supported by precise 99.9 % MPPT tracking accuracy to maintain stable output even under variable irradiance. A maximum DC input of 10,500 W offers ample headroom for larger arrays or future expansion without hardware change.

Built for Reliability & Protection

Engineered for long-term operation in British weather, the KH7 features a robust IP65-rated aluminium housing that permits outdoor mounting without additional shielding. Passive cooling keeps acoustic output below 30 dB while minimising maintenance requirements. Safety and grid integration are fully covered through compliance with EN 62109 and G99 standards, with built-in Type II surge protection on both AC and DC sides, residual-current and insulation monitoring, and anti-islanding logic for secure commissioning.

Key Features

• Dual MPPT inputs (80 – 500 V) optimised for split or shaded roof arrays.
• Peak conversion efficiency 97.8 % / Euro 97.4 % / MPPT accuracy 99.9 %.
• Fan-free IP65 design ensuring quiet, weather-resistant operation below 30 dB.
• Supports Fox HV LFP batteries (85 – 480 V) with 50 A charge and discharge current.
• Wi-Fi / LAN monitoring via FoxCloud with optional 4 G module for remote sites.
• Comprehensive grid protection suite meeting UK G99 requirements.

If you’re wondering how the KH7 performs in typical UK weather, its broad MPPT range and low start-up voltage keep the system active during low-light mornings and overcast afternoons, ensuring steady generation throughout the year. This makes it one of the most efficient choices for solar self-consumption and battery charging under variable British conditions.

Specification data verified from Fox ESS K-Series KH7 datasheet (Version 1.6, March 2023).

Seamless Integration with Solar Panels & Battery Storage

The Fox ESS KH7 hybrid inverter integrates effortlessly with a wide range of solar panels and Fox’s own high-voltage LFP battery ecosystem. Using a smart DC-coupled architecture, it supports up to seven modules connected in series to provide scalable energy storage of up to 33.24 kWh. This flexibility allows homeowners to expand their system capacity without changing the inverter, supporting future upgrades to larger PV or battery configurations.

By maintaining direct DC communication with the batteries, the KH7 minimises energy conversion losses and enables faster, more efficient charging cycles — a key advantage for UK households seeking to maximise self-consumption and backup capability during grid interruptions.

Smart Monitoring & Connectivity

Equipped with FoxCloud monitoring, the KH7 provides full visibility of energy generation, battery charge, and grid interaction. Homeowners can view real-time and historical data via the FoxCloud app or web dashboard, while installers benefit from remote diagnostics and firmware updates. The inverter includes Wi-Fi and LAN connectivity as standard, with optional 4G modules for off-grid or rural sites.

Communication interfaces such as RS485, CAN, DRM, USB, and CT inputs ensure smooth integration with smart meters, BMS units, and export control systems — essential for achieving optimal performance under dynamic UK grid tariffs.

Compact Design & Rugged Construction

The KH7 is engineered with installers in mind. Measuring 450 × 527 × 208 mm and weighing approximately 29 kg, it combines compact dimensions with strong weather protection in an IP65-rated aluminium enclosure. Its natural convection design eliminates moving parts, keeping operating noise below 30 dB and maintenance to a minimum — perfect for plant rooms, garages, or outdoor wall mounting.

Installer Guidance & System Notes

Why We Recommend the Fox ESS KH7

At Evergy, we recommend the Fox ESS KH7 for its combination of efficiency, reliability, and intelligent monitoring. Its compact IP65 housing and dual MPPT design make it a trusted option for UK homes where system stability and long-term value are essential. The inclusion of FoxCloud monitoring simplifies maintenance and enables both users and installers to manage systems with ease.

Evergy is the renewable division of LAMPS Electrical, an independent British wholesaler with over 15 years’ experience supporting installers nationwide. Every inverter we supply is sourced from verified manufacturers and backed by our in-house renewables team for technical support, specification advice, and warranty assistance.

Compare in the Fox K-Series Range

FAQs – Fox ESS KH7 7kW Single Phase Hybrid Inverter

For detailed advice on system configuration or compatibility, contact Evergy — your trusted UK supplier of Fox ESS solar inverters, batteries, and renewable technology solutions.