The Fox ESS KH8 is a 8kW single-phase hybrid inverter for a 220/230/240V AC, 50/60Hz grid connection, with a 16,000W maximum PV array rating, 3 MPP trackers and an IP65 wall-mounted enclosure. It suits single-phase homes where the design needs more output than KH7 without adding a fourth MPPT input, with high-voltage battery operation and EPS output available where the system is designed for it.

• 8kW nominal AC power with 34.8A nominal current and 38.3A maximum AC current
• 220/230/240V AC single-phase grid connection at 50/60Hz
• 3 MPP trackers with one string per tracker and 600V maximum DC voltage
• Meter optional, Wi-Fi, 4G optional, DRM, USB, CT and RS485 communications
• PV reverse polarity, battery reverse, anti-islanding, leakage-current and Type II AC and DC surge protection
• 450mm wide x 527mm high x 208mm deep, 29kg for the KH model
• IEC 62109-1, IEC 62109-2, IEC 62477-1 and G99 listed in the datasheet

Why specify KH8 instead of the smaller KH7?

KH8 is the 8kW step in the retained KH line. It gives installers more AC output and a 16,000W maximum PV array rating while keeping the same single-phase format, case size and three-MPPT layout as KH7.

This makes it useful where the property has a larger PV design but the electrical design still calls for single-phase equipment. The page should sit in the solar inverter category rather than being redirected from old string inverter pages.

What are the main PV design limits?

The KH8 datasheet lists 16,000W maximum array power, 12,000W maximum DC input power and 600V maximum DC voltage. It uses an 80V to 500V MPPT range and 75V start-up voltage.

Each tracker accepts one string, so layout planning should match the three inputs available. Current, voltage and module-string calculations remain part of the installer design.

What battery setup should be checked?

The Fox ESS UK KH/KA page lists EP, EQ and CQ battery ranges for the platform. EP6 and EP12 arrangements are shown from one to four batteries, with a junction box needed when two to four EP batteries are installed.

The KH datasheet lists an 85V to 480V Li-ion battery voltage range and 50A maximum charge and discharge current. Those limits should be checked against the selected battery stack before ordering.

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