Batteries.md

Measuring battery voltages

The motor controller runs on 48V, so we're using 4 parallell packs of 4x 12V batteries in series.
For the sake of battery health, I like to keep an eye on the voltage of each battery seperately.
To accomplish this, we're using 4 of these voltage hats for raspberry pi. These can among other things read 4 voltages.
Each of them have their own Raspberry Pi Zero W, which have this config:

• Connected to boat WiFi
• SSH enabled
• Password changed
• Hostname like batterypack1, batterypack2, etc
• Docker and docker-compose installed
  • curl -fsSL https://get.docker.com -o get-docker.sh
  • sudo sh get-docker.sh
  • sudo usermod -aG docker pi
  • sudo apt install python3-pip libffi-dev -y
  • sudo pip3 install docker-compose
  • sudo nano /lib/systemd/system/docker.service
    • Replace the ExecStart line with:
    • ExecStart=/usr/bin/dockerd -H tcp://0.0.0.0:4243 -H unix:///var/run/docker.sock
    • So Portainer on main Pi can manage and monitor this remote docker instance.
      • https://scriptcrunch.com/enable-docker-remote-api/
• A small Flask webserver running on docker. See BatteryServer.py.
  • docker-compose up --build
    • See docker-compose.yml for details
  • Home Assistant can now query http://batterypack1.local/1, and get the voltage of the first battery in the first pack.