Connecting a JK BMS


This guide is for the original JK BMS. See our JK inverter BMS guide if you have their newer "JK PB" BMS range.

Step 1 - Connections and components

The typical setup requires the two components below. We do not sell any of them.

  • JK BMS RS485 module
  • USB RS485 adapter (ensure it's not TTL). We recommend FTDI chip adapters.

Note you can also use a USB TTL adapter instead of the two adapters above, but it requires manual wiring into the JK BMS where the JK BMS RS485 module connects.

JK BMS RS485 connections

Step 2 - Configure SolarAssistant to connect to a JK BMS

On the SolarAssistant configuration page, select the protocol below.

Select one or more USB cables and click connect:

Plug the RS485 USB cable into the SolarAssistant monitoring device. Once you click "connect" on the configuration page, you should see each BMS show up as a battery pack as shown below.


One pack will be shown for each JK BMS connected in step 2 above.

JK BMS pack monitoring
JK BMS chart monitoring