Fox ESS KH10.5 10.5kW K Series Single Phase Quad MPPT Hybrid Inverter

The Fox ESS KH10.5 (part number FE-KH1-10.5) is a 10.5 kW single-phase hybrid inverter with four independent MPPT trackers, designed for large-scale residential PV arrays across multiple roof orientations. As a hybrid inverter and battery storage controller, the KH10.5 combines solar PV conversion with high-voltage battery charge/discharge management in a single unit. It supports PV arrays up to 18,000 Wp with a maximum PV input of 13,500 W at up to 600 V, achieves a Euro efficiency of 97.4%, and includes built-in EPS with less than 10 ms changeover time for backup operation. The KH10.5 is compatible with Fox ESS ECS and HV2600 battery ranges with 50 A maximum charge/discharge current. Built-in Type II AC and DC surge protection, IP65 rated for outdoor installation. CT clamp and WiFi dongle included. Weighs 29 kg. NRS certified. Available from DECO Group, a UK-based solar trade wholesaler.

Key Technical Details

• Part number: FE-KH1-10.5
• Supplier part number: KH10.5
• Model: KH1-10.5
• Inverter type: Single-phase hybrid (PV inverter and battery storage controller)

PV Input

• Maximum PV array power: 18,000 Wp
• Maximum PV input power: 13,500 W
• Maximum input voltage: 600 V
• MPPT operating voltage range: 80 V to 500 V
• DC startup voltage: 75 V
• Maximum DC input current: 16 A per input (A/B/C/D)
• Maximum short-circuit current: 20 A per input
• Maximum DC inputs: 4
• MPPT quantity: 4 (1 string per MPPT)
• Connector: MC4 (8 included)
• Integrated DC switch: Yes

AC Output (Grid)

• Rated output power: 10,500 W (10,500 VA)
• Rated grid voltage: 220/230/240 V (180 V to 270 V range)
• Rated grid frequency: 50/60 Hz
• Maximum AC power (5 minutes): 10,000 W
• Surge AC power (1 second): 10,500 W
• Euro efficiency: 97.4%
• Transformer: None (transformerless)

Battery

• Battery type: High-voltage lithium (LFP)
• Battery voltage range: 85 V to 480 V
• Recommended battery voltage: 300 V
• Maximum charge current: 50 A
• Maximum discharge current: 50 A
• Battery communication: CAN / RS485
• Battery charge efficiency (PV to battery): 98.5%
• Battery discharge efficiency (battery to AC): 97.0%

EPS (Emergency Power Supply)

• EPS supported with battery
• EPS changeover time: less than 10 ms

General

• Surge protection: Built-in Type II (AC and DC)
• Cooling: Natural convection (fanless)
• Ingress protection: IP65
• Monitoring module: WiFi dongle included; 4G optional
• Communication: RS485, CT, USB, Meter (optional), DRM
• Dimensions: 450 x 527 x 208 mm (W x H x D)
• Weight: 29 kg

Key Features

• Quad MPPT (4 independent trackers) for large PV arrays across multiple roof orientations and shading zones
• Full hybrid functionality: PV inverter and battery storage controller in a single unit
• 10.5 kW rated output with built-in EPS and less than 10 ms changeover for backup power
• 98.5% PV-to-battery charge efficiency and 97.0% battery-to-AC discharge efficiency
• Built-in Type II surge protection on both AC and DC sides
• IP65 rated with natural convection cooling for quiet outdoor installation
• CT clamp and WiFi dongle included in the box
• A second CT clamp is required if a second generator is present on site
• NRS certified

System Compatibility

• Compatible with Fox ESS ECS2900 batteries (1 x Master + 1 x Slave minimum, up to 6 x Slaves maximum)
• Compatible with Fox ESS ECS4100 batteries (1 x Master + 1 x Slave minimum, up to 6 x Slaves maximum)
• Compatible with Fox ESS ECS4300 batteries (1 x Master + 1 x Slave minimum, up to 6 x Slaves maximum)
• Compatible with Fox ESS ECS4800 batteries (1 x Master + 1 x Slave minimum, up to 6 x Slaves maximum)
• Compatible with Fox ESS HV2600 batteries (1 x BMS + 2 x HV2600 minimum, up to 8 maximum)
• This is a hybrid inverter and battery controller; if retrofitting, it replaces the existing PV inverter

Installation Notes

• At 29 kg, a two-person lift is required
• IP65 rated for indoor or outdoor wall-mounted installation
• CT clamp must be fitted correctly for accurate import/export sensing
• Modbus meter optional for preference or if the distance from inverter to grid supply exceeds 30 m
• Must be installed by a qualified electrician or technician in compliance with local wiring regulations

Included Components

• 1 x Fox ESS KH10.5 hybrid inverter
• CT clamp for zero export control
• WiFi dongle for Fox Cloud monitoring

Certifications and Compliance

• IEC 62109-1, IEC 62109-2 (Safety)
• IEC 62477-1
• G99
• G100
• EN 50549
• NRS 097-2-1
• EMC: EN 61000-6-1/2/3

Warranty

• Standard warranty: 5 years
• Extended warranty: 10 years when the installation is registered with Fox ESS online

Common Questions

Click a question below to reveal the answer.

What is the difference between the Fox ESS KH10 and KH10.5?

The KH10.5 has a rated output of 10,500 W (vs 10,000 W on the KH10) and supports a higher PV array capacity of 18,000 Wp. Both share the same enclosure, weight (29 kg), quad MPPT configuration, and battery compatibility.

What batteries are compatible with the Fox ESS KH10.5?

The KH10.5 is compatible with the Fox ESS ECS battery range (ECS2900, ECS4100, ECS4300, ECS4800) and the Fox ESS HV2600 batteries. Maximum charge/discharge current is 50 A.

Does the Fox ESS KH10.5 provide backup power?

Yes. The KH10.5 has built-in EPS (emergency power supply) with a changeover time of less than 10 ms when paired with a battery system.

What are the dimensions and weight of the Fox ESS KH10.5?

The KH10.5 measures 450 x 527 x 208 mm (W x H x D) and weighs 29 kg. It is wall-mounted; a two-person lift is required.

Why does the Fox ESS KH10.5 have 4 MPPTs?

Four independent MPPT trackers allow the KH10.5 to manage four separate string orientations, roof faces, or shading zones independently, maximising total system yield on complex roofs.

DECO Group supplies Fox ESS K Series hybrid inverters alongside the full ECS and HV2600 battery ranges, BMS controllers, CT clamps, monitoring modules, and all associated system accessories. Browse our Fox ESS hybrid inverter catalogue for complete single-phase storage system components.

About DECO Group

We supply Fox ESS hybrid inverters, high-voltage battery modules, and system accessories to professional solar installers and electrical contractors across the UK. Our K Series range includes the KH10 and KH10.5 with compatible batteries and installation hardware in stock for complete system builds. Visit decogroup.co.uk for the full catalogue.