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123electric Smart User manual

  • Hello! I've reviewed the user manual for the 123electric SmartBMS to USB cable. This document describes how to install and use the cable with Victron Cerbo/Venus devices and Raspberry Pi. It details the cable's ability to isolate BMS signal to avoid ground differences and mentions it's compatibility for data monitoring including SoC, current, power, and pack voltage. I'm ready to answer your questions about the device.
  • Which devices can the USB cable be used with?
    Is there any polarity to consider when connecting the wires?
    What kind of BMS data can be monitored via Victron Cerbo and VRM?
Manual
Rev 1
2
The 123\SmartBMS to USB cable is a handy cable which can be used to display BMS data on the
Victron Cerbo/Venus or for custom 123\SmartBMS projects like on the Raspberry Pi.
Safety
To avoid any problems with ground differences, the BMS signal is isolated from the USB signal.
Installation
Installation is simple: just plug the two wires into the 123\SmartBMS End Board Ext Out. There is no
polarity.
Victron Cerbo integration
There is full integration with the 123\SmartBMS Victron Cerbo and Victron VRM. This enables
monitoring of most important BMS data like SoC, current, power, pack voltage and more via a CCGX
and/or Victron VRM.
Just plug the cable into the 123\SmartBMS End Board Ext Out and the USB into the Victron Cerbo.
Download venus-data.tar.gz from our website and put it on a usb drive or SD card (do not extract).
Plug this USB drive/SD card into the Cerbo and reboot the Cerbo. The software is now automatically
copied. Reboot again for installation. If you do not see the BMS appear on the Cerbo, reboot again.
You can remove the USB/SD card.
Important
This project requires VenusOS 2.80 or higher. Make sure you update to the latest release (candidate)
to get v2.80 or higher.
The USB cable can only be plugged into the two USB ports on the edge. The third USB port is a power
port and cannot be used.
It is possible to connect multiple BMS to the Cerbo by giving each BMS it’s own USB cable. The
CCGX/console will display each BMS it’s own data.
Raspberry Pi projects
To speed up development of custom Raspberry Pi projects, we have developed code for the
Raspberry Pi. This code connects to the BMS via the 123\SmartBMS to USB cable and can upload the
BMS data to Thingspeak. For more installation instructions, please see our Github.
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