Fox ESS KH9 9kW Inverter: The Ultimate Flexible Single-Phase Hybrid Solar Inverter

The Fox ESS KH9 delivers an impressive 9kW of single-phase hybrid inverter power, positioning it as a top-tier solution for UK homes with high energy consumption on a single-phase supply. Part of the sophisticated K-Series, it masterfully manages energy between extensive solar panel installations, compatible high-voltage batteries, and the grid, offering maximum self-sufficiency and powerful backup capabilities.

Ultimate Solar Harvest with Quad MPPT

What's the best solar inverter for intricate roof designs? The KH9 truly excels with its four independent Maximum Power Point Trackers (MPPTs), a standout feature confirmed in the K-Series technical information. This provides unparalleled design freedom for large solar panel systems spread across multiple roof sections, orientations, or experiencing complex shading. Each MPPT independently optimises its connected string (up to 16A max input current per string), guaranteeing the highest possible energy yield from your entire solar investment.

High-Power Battery Energy Storage Integration

This hybrid inverter is designed to work seamlessly with substantial battery energy storage systems. It supports compatible high-voltage LFP batteries (85-480V range) and manages them efficiently with a high maximum charge/discharge current of 50A, as specified in the product datasheet. This capacity allows for rapid charging from surplus solar and powerful discharging to meet peak household demands, significantly enhancing energy independence.

Maximise Savings & Efficiency

Invest intelligently in your energy future. The KH9 operates with very high efficiency (up to 97.80% Max. Efficiency listed in the specs), ensuring minimal energy loss. By enabling extensive use of stored solar energy, it dramatically reduces the need for costly grid electricity. Its smart functionality also allows for potential optimisation strategies using time-of-use tariffs, enabling programmed battery charging during off-peak hours.

Powerful & Reliable Backup Power (EPS)

Ensure continuity during power cuts. When connected to an appropriate battery bank, the KH9 provides a powerful 9kVA single-phase Emergency Power Supply (EPS) output. With a switchover time of less than 20ms cited in the technical data, it delivers near-instantaneous backup power to keep essential circuits running seamlessly when the grid fails.

Robust Design & Smart Connectivity

Built for performance, the KH9 features a durable IP65-rated enclosure suitable for outdoor installations (use correct cabling and mounting). Comprehensive remote monitoring of your entire energy system is available through the Fox ESS Cloud platform via optional WiFi, 4G, or LAN modules, providing valuable insights into performance and energy flow.

Why Evergy Recommend This Product

The Fox ESS KH9 stands out for demanding single-phase applications:

• High Single-Phase Output: 9kW capacity meets very high residential energy needs.
• Quad MPPT Flexibility: Offers ultimate optimisation for large, complex solar arrays.
• Efficient Battery Management: Supports significant storage capacity with high charge/discharge rates.
• Strong Backup Power: Delivers substantial 9kVA single-phase EPS (with batteries).
• Advanced Energy Control: Maximises self-consumption and supports smart tariff strategies.

Ideal For / Target Audience

This 9kW single-phase hybrid inverter is perfectly suited for:

• Large UK homes with very high electricity demand on a single-phase connection.
• Properties with extensive roof space accommodating large solar panel systems across multiple orientations.
• Homeowners installing significant battery storage capacity for near off-grid living or maximum savings.
• Users requiring powerful backup for a wide range of home circuits during power outages.

Technical Specifications Overview

Key specifications for the KH9 model, based on the datasheet, include:

• Nominal AC Output Power: 9000VA
• Max. Battery Charge/Discharge Current: 50A
• Number of MPP Trackers: 4
• Max. Efficiency: 97.80%
• EPS Output Power: 9000VA (Single Phase)
• Protection Degree: IP65

For comprehensive technical specifications, please review the specs tab or the Fox ESS K-Series datasheet. For slightly lower power requirements, consider the Fox ESS KH7 7kW version.

Achieve Peak Single-Phase Performance

Select the Fox ESS KH9 hybrid inverter for maximum flexibility and power in your large single-phase solar and storage installation. Ensure optimal performance by pairing with compatible high voltage batteries and high-output solar panels. Contact Evergy’s experts for bespoke system design and advice.