This is the foundation post for the rest of my Home Assistant energy series (if I ever get to it). Before I could automate around electricity, I obviously needed a (real-time) view of what’s actually flowing in and out. Some context first I have solar panels (with a Huawei inverter installed by the previous owner) Smappee EV charger (bad purchase, it’s quite dumb and has a terrible UI and Home Assistant can’t control it), and I recently got 2x Marstek batteries (great hardware, cheap, and the worst software ever, truly terrible software. Oh and support started ghosting me after I lost my patience around Lunar New Year — they just will not reply to any of my help messages anymore). I drive a Polestar 4 (first edition, 2025) note: the original Huawei inverter was dead when I moved in and likely never worked, don’t think the previous owners ever noticed & it got replaced under warranty after a lot of chasing and nagging Huawei directly. Rensol couldn’t move it forward and I basically…
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