I have Victron Energy Multiplus II GX 48V-5000VA-70A inverter and 5kW 48V 100Ah LiFePo battery from Ukrainian vendor ADS.
First initialization and configuration Victron Energy Multiplus II GX inverter
- For testing reason I connected cable to the AC-IN terminal block on inverter and to electrical socket.
CAUTION!!! Be sure that phase, neutral and ground is correctly connected to the inverter AC-IN terminal!!!
Connection of the AC cabling - Power on inverter (put switch button to the position I)
On/Off/Charger only Switch - Connect WiFi antenna to the socket on the top of the inverter.
- There are several options how to connect to the inverter:
- Using MK3-USB cable to connect inverter and PC/laptop. This cable is not included with inverter and have a price EUR~70-90.
- Install VictronConnect app on smartphone/tablet and connect to the inverter via Bluetooth.
Bluetooth password is printed on a label located on the inverter.
Go to Settings and configure WiFi connection on the inverter.
Picture 1. Victron Multiplus II GX
WiFi/Bluetooth/VRM data.
Picture 2. VictronConnect - Device List. 
Picture 3. VictronConnect - Multiplus II GX data 
Picture 4. VictronConnect - Settings - Network - Or connect inverter to home network via ethernet cable. This option is more stable and better then WiFi.
- Or connect to the inverter WiFi access point. WiFi AP password is printed on a label located on the inverter (Picture 1.).
- Open web browser and go to address http://venus.local. If this address don't work check inverter IP address (you can find inverter IP address in VictronConnect app, for example) and go to address http://<inverter_IP_address>. This is inverter remote console. All inverter configurations could be done via this console.
Picture 5. Inverter Remote Console - Register inverter on VRM portal
- Create free account on VRM portal
- Register inverter on VRM portal with inverter VRM ID. You can find VRM ID on the label on the inverter (Picture 1).
- Keep inverter connected to the internet and VRM portal will collect and show real-time info of your installation
Picture 6. VRM Dashboard
Connect battery to the inverter
- I have battery ADS LT-LFP 48100Т (5kW 48V 100Ah LiFePo) from local Ukrainian vendor ADS. This battery built on prismatic cells and JK Inverter BMS PB1A16S10P (Hardware Ver: V15A, Firmware Ver: V15.27).
Picture 7. ADS LT-LFP 48100T battery 
Picture 8. Battery JK BMS data - Install JK BMS app on smartphone/tablet and connect to the inverter via Bluetooth. Default password is "1234".
- Prepare cable to connect battery and inverter. You need Type A cable to connect battery BMS to inverter VE.Can port (VE.Can to CAN-bus BMS cables manual).
Table 1. Cable Type A pinout scheme.Function Victron VE.Can side Battery side GND Pin 3 Pin 6 CAN-L Pin 8 Pin 5 CAN-H Pin 7 Pin 4 - Open inverter remote console. Press "Enter" button, go to "Settings" -> "Services" -> "VE.Can port" -> "CAN-bus profile" and select option "CAN-bus BMS LV (500 kbit/s)".
- Open JK BMS app, go to "Settings" page, click on "Verify PWD" and enter Bluetooth password once again (default is 1234), click "Advanced Settings". Scroll down and click on the option "CAN Protocol No.:", select option "004 - Victron_CANbus_BMS_protocol_20170717", click "Ok" to set this option.
Picture 9. JK BMS CAN protocol for Victron Multiplus II GX - Connect battery and inverter with prepared cable.
Put the VE.Can RJ45 terminator to the second VE.Can port in the inverter.
Be aware that cable is not symmetrical. So you must connect battery cable side to the battery and VE.Can cable side to the VE.Can port in inverter.
Picture 10. Inverter VE.Can ports - If connection established successfully you can see new device "JK-BMS" on inverter Remote Console.
Also battery will show in VRM portal.
Picture 11. JK BMS in Inverter Remote Console 
Picture 12. Battery on VRM Dashboard 
Picture 13. Battery in VRM Device List
