Fox ESS 1ph Energy Meter CHNT DDSU666

FE-AIO-EM | Single-phase CHNT DDSU666 smart meter with 100A external CT for accurate import/export monitoring in Fox ESS systems over long distances.

Key Features

• Single-phase electronic energy meter (DDSU666) with Modbus RTU communication.
• Includes external 100A CT clamp for non-invasive current measurement.
• High accuracy Class B active energy measurement (±1.0%).
• Essential for export limitation when inverter >30m from consumer unit.
• RS485 interface with 9600 baud rate for Fox ESS inverter integration.
• DIN-rail mounting (35mm) for standard distribution board installation.
• Wide operating temperature range -25°C to +55°C.

Technical Specifications

Rated Voltage	220-240 V AC
Rated Current	5(80)A direct / 100A via CT
Accuracy Class	Class B (±1.0% active energy)
Communication	RS485 Modbus RTU (9600 bps)
Display	LCD (voltage, current, power, energy, PF, frequency)
Pulse Output	800 imp/kWh
Dimensions	36 × 89 × 74 mm (meter)

Installation & Application

• Install meter and CT clamp at incoming mains supply position (consumer unit head).
• RS485 cable from meter to inverter (max recommended 1000m with screening).
• Measures positive/negative active energy, voltage, current, power factor and frequency.
• Required for compliant zero-export installations with Fox hybrid/AC/AIO inverters.

MPN: FE-AIO-EM
Model: CHNT DDSU666 Single-Phase with 100A CT

Replaces CT clamp-only solutions for long cable runs, providing full electrical parameter monitoring and precise export control for Fox ESS energy storage systems.