Prometheus Exporter for Trucki2Sun Gateway

After lots of off-grid experiments over the past couple of years I finally installed a grid-tied solar system made up of a hand picked selection of components incl. a Lumentree Sun inverter feat. Trucki stick. This appears to be something mostly made for the German market but if you’re in Europe generally and run on 230V & 50Hz I can only recommend it so far (check your local laws blabla).
The general idea here is that due to German laws around `Balkonkraftwerke and their limitations one wants to exporter nothing into the grid and use all of the collected energy for their own needs. In order to do that you need something that constantly monitors how much is being used and then instructs the inverter to only produce just barely less power than that. The Trucki stick attached to the inverter does one of the two jobs required. It hosts a lot of data locally that I wanted retain for analysis of the efficacy of the system but it only comes with a service builtin that allows it to publish the data to a MQTT server/broker. I personally have no use for MQTT in my life and did not want to deal with the overhead which then also required a MQTT -> Prometheus bridge which is why I figured I throw some work knowledge at the problem and write my own Truck -> Prometheus exporter.

https://github.com/tzeejay/trucki2prometheus

The exporter grabs as much useful data as it possibly can from the Trucki stick and makes it available for Prometheus to scrape. If you intend to deploy this yourself, I would generally recommend to not go too crazy with the scraping intervals both on the Trucki side as well as on the Prometheus side in order to allow for enough compute resources to actually manage your inverter and power production!
I personally run the exporter off of a Raspberry Pi 5 with the help of systemd, though as the project is written entirely in Go it is very portable and should support any platform that you prefer (as long as it is supported by Go).

With all of that said, I hope that anybody but me finds any use in this tool to monitor their Lumentree Sun feat. Trucki stick nulleinspeisung operations in Prometheus without any additional MQTT overhead.
With a little bit of love you can then create pretty graphs in Grafana that look like this, I assume that I am mostly going to ignore these day to day but

Solar generation continues to absolutely delight me and I intend to keep tinkering with it. This little Balkonkraftwerk has only been operational for a handful of days but appears to be able to cover 25% of the power consumption of the house it is attached to, even as we go into winter here in Germany.
Seeing this in front of my own eyes gets me really excited for the future :)

23.10.2025