Background

These are Munin plugins for monitoring go-eChargers for electric vehicles. They are using the device's local API. That means the device needs to be accessible from the LAN. Authentication against go-e's cloud service is not supported.

The plugins make a lot of requests to the device, but I haven't noticed any problems with that yet.

Plugins

• go_echarger_charging Displays state of current charge, a possibly configured limit and optionally your battery's capacity (see the Setup section below).
• go_echarger_current Displays currents (in Ampere) of all three lines, the current supported by an attached cable, the configured limit (may be changed by pressing the button on the device) as well as the absolute maximum current supported by the charger.
• go_echarger_efficiency Display efficiency factor per line.
• go_echarger_energy Displays the total energy output (in kWh) by the device as well as per individual RFID token slot.
• go_echarger_power Displays the current power output (in kW) per line and in total.
• go_echarger_state Displays various status fields that the device reports.
• go_echarger_temp Displays all temperatures that the (current/new gen) device reports.

Setup

Just drop the plugins into /etc/munin/plugins and restart munin-node.

Unless your go-eCharger can be reached with the hostname go-echarger you need to add this somewhere in /etc/munin/plugin-conf.d/ with the proper hostname or IP address:

[go_echarger_*]
env.host go-echarger.home.well-adjusted.de

You can also optionally set your EV's battery capacity in kWh to have it displayed as a constant in the charging graph:

[go_echarger_*]
env.capacity 28

None of the plugins need any special privileges. There is no need to run them as root.

You need to have jq installed as this tool is used for parsing the JSON returned by the charger's API.

Examples

Here's my setup with all default graphs: https://jigsaw.home.well-adjusted.de/munin/go_echarger-week.html

TODO

• Make only one API request per plugin execution
• Add configuration for battery capacity to display in the charging plugin

Contact

For questions and support, feel free to use the Issue Tracker or drop me an e-mail at js+github at wim.re.