The GoodWe GMK330 smart meter is a metering unit designed for use with GoodWe inverter systems. It is suitable for consumption measurement, load monitoring, export limitation, and zero-feed applications.

The device operates with external current transformers (CTs), and according to the documentation, it comes with 3 CTs. The newer model uses a standardized 120A:40mA current transformer. The previous 200A:50mA version will be discontinued after June 2026, according to the manufacturer's notice.

The GMK330 supports 1P2W, 3P3W, and 3P4W network types. It connects to the inverter via RS485 communication, with a maximum communication distance of 1000 meters. The accuracy class for voltage, current, and active energy is Class 0.5, and for reactive energy, it is Class 1.

The meter is DIN rail mountable and has a 4-module housing. It is IP20 rated and designed for indoor installation. The device features 4 LED status indicators and a reset button.

Key Features at a Glance:

GoodWe smart meter with external CTs
Can be used for three-phase, single-phase, and 3-wire networks
Supported network types: 1P2W / 3P3W / 3P4W
Supplied with 3 current transformers
CT ratio: 120A:40mA
Previous version: 200A:50mA, being phased out
RS485 communication, up to 1000 m distance
Accuracy: Class 0.5 for voltage, current, and active energy
Reactive energy accuracy: Class 1
DIN rail mountable, IP20 rated design with 4 LED status indicators

The GoodWe GMK330 is suitable for GoodWe inverter systems when a factory-supplied external CT-based metering unit is required for consumption monitoring, export limitation, or hybrid inverter charge control.