This page provides an overview of the wiring and pinout for the GRNbms MK3 Mini. Please refer to the respective Wiki pages for detailed information about CAN, RS485, and Modbus communication.

• Recommended input voltage: 11 – 14 V DC
• Power should be supplied via the designated power input pins (see pinout table below).

• The RJ45 port is directly compatible with a standard Ethernet cable.
• Designed for seamless plug-and-play connection with the GRNcmu Multi Mini module.

• Compatible with standard 4-pin 12 V PC cooling fans.
• The GRNbms provides PWM control and tachometer feedback support.

The RS232 port on the GRNbms MK3 Mini is directly compatible with Victron’s VE.Direct protocol.

• Allows seamless integration with Victron equipment such as battery monitors and charge controllers.
• No special adapter or level shifting required — just connect and communicate.

This makes the GRNbms a perfect fit for hybrid or off-grid systems using Victron infrastructure.

• Ready to use with Nextion displays.
• Direct plug-in, no additional adapters required.

Supply & Relays

5V Aux

RS232

Sensors

GRNcmu RJ45

Inverter RJ45

Inverter, CMU, Shunt - CAN

Display

FAN

RS232