Hardware
Bought a refurbished HP ProDesk G4 with 8GB RAM and a 128GB NVMe for 109€, a shelly pro-1 with a double poled contactor(I don’t know if that’s the correct translation) for the car, some smart switches for the boilers and some other stuff.
I already had 6kWp solar panels, a 10kWh huawei battery and an LG airconditioner.
Software
Home assistant runs in a proxmox VM (4GB ram and 2 cores) so I can use the prodesk for some other small projects.
Integrations
Entso-e for the electricity prices, emhass for calculations and planning, wclr to talk to the inverter and battery, solcast for predictions. Google Drive backup integration, remote calendar integration, influxDB integration, file editor, the Belgian weather integration and nabu casa.
Calling emhass day ahead optim and MPC optim with parameters based on entso-e with some calculations on them to get my input and output tarifs and different values for the deferrable loads depending on what my calendar says (nightwork, holiday or [different]). I put up a dashboard with some sliders to easily edit those inputs without having to edit the code.
After about 2 weeks of faffing about with it, mostly vibe coding and standing up against the gasslighting of the LLM I used, yesterday I finally got everything in working order I think. Putting the optimization table with the prices and automation yamls into the LLM gives promissing result. Tommorrow the last automation (the one talking to the battery) will go live as my dynamic tariff wil start form the first of may. Wish me luck guys.
In a couple of months, when influx has gathered some more data, I’ll integrate the ML models the emhass offers.
Oh and a very small sideproject I did, since I’m a chronic mailbox avoider (which is a very expensive habit), I’ve put an NFC tag in my mailbox, if i don’t scan it for a week I’ll start getting messages, once a day for 2 days and then every 5 seconds. The timer pauzes when my calendar says I’m on a holiday. When I scan the tag, the timer resets.
Next up are some smart lights I have laying around, looking into the zigbee stuff, mostly to use motions detectors to trigger some lights.
I can’t say it was easy, but it was fun and it will save me a couple hundred euros per year. Name me one other hobby that actually saves you money 
