The home server behind this series is an old board with a Celeron J1900, four slow cores from 2013. It runs openHAB, InfluxDB, Grafana, Prometheus, ownCloud and about 20 containers. It felt sluggish, and the load average sat at 1.3 even at night, when nothing happens. So I went looking… Continue reading
Three backup problems in one week, none of them in a log: a restore test for InfluxDB, an ACL mask that blocked Duplicati, a hidden –no-encryption and a database dump of 20 bytes. Continue reading
Dynamic or fixed electricity price in Austria? With EEX futures and my own consumption data, a fixed price saves me about 265 EUR in winter 2026/27. Continue reading
In the post about heating water the water boiler moved to the cheapest hours of the day. This part is about a different number. Not when the house uses energy, but how much at once. Why the peak matters A smart meter does not only count kWh. It also records… Continue reading
Since 2026, Austrian grid operators charge less for the grid between 10:00 and 16:00 from April to September, the “Sommer-Nieder-Arbeitspreis”, or SNAP. The idea is simple: in summer the grid is full of solar power at noon, so power used at that time should be cheaper, and people should move… Continue reading
The data is in place, and I trust my deployment, from Compose files in git to one Ansible command. Time to actually do something with it. A tariff that follows the exchange Since July 2025 I am with AAE Natur.spot, before that I had the hourly tariff of aWATTar. With… Continue reading
A setup like this is never finished. Since the first posts went online, a few things changed that do not need a post of their own, but would make the old ones wrong if I kept quiet about them. More data from the inverters In the post about the balcony… Continue reading
After moving from Portainer to git, every Compose file and every piece of configuration was in git. But a git repository is only a description. Getting it onto the server was still a list of manual steps that I would have to remember after a disk failure. Probably at the… Continue reading
openHAB, Mosquitto and Grafana run as Docker containers on my OpenMediaVault server, next to a few other services (reverse proxy, VPN, file sync, backups). For a long time they were stacks in Portainer. Paste a Compose file into a text box, press deploy, forget about it. The problem with clicking… Continue reading
The balcony PV system gave me two numbers: what the panels produce and what flows through the grid meter. Next, I wanted both in one place, stored and drawn as nice graphs. The setup Three containers and one service run on my home server: openHAB I keep the whole openHAB… Continue reading