Victoria metrics and grafana is great. I only wish I could enter descriptions for the metrics to populate the description in the grafana metrics explorer which is traditionally done by Prometheus metric metadata “help” field.

Victoria metrics/ grafana is supplanting our industrial historian, which is admittedly not a best in class product - I am sure osi pi is better

Is anyone aware of any other OSHW alternatives to this? Preferably with Ethernet. ESPHome would be preferable.

The clones I can find are roughly the same price as the "original" hardware.

ATM90E32AS seems to be ~$1 per channel on JLCPCB, so I'd imagine this could be pretty cheap with SMT assembly. My use case is like ~60 circuits.

You can install esphome on Emporia Vue. https://github.com/emporia-vue-local/esphome (not used this myself). Vue V3 has wired ethernet support too.

The main one I'm away of is IotaWatt, which I've had running in my panel for the last few years without incident.

Eh, that's even more expensive. I think I'll end up having to develop my own hardware, even with Vue blowing $1500 for energy monitoring is a bit too much given how cheap the hardware can be.

for 60 circuits, you would need 4 units at 16 circuits each. which would be around $700 at current Amazon prices.

Many people flash the emporia vue with espHome

The device the OP puts Tasmoto on from athom.tech can also be ordered for the same price pre-flashed with ESPHome to work with Home Assistant. I have used them with 2500W single-socket loads and been happy with them for a year or so. For whole house load I'd recommend integrating with whatever smart meter tech your country uses. For the in-between size loads eg. 32A breakers in a consumer unit I have not found a reliable and cost effective solution yet.

I bought a CURB Energy monitor about 6 years ago. Does anyone know if it's possible to flash open source firmware on it? It only has a cloud integration, but I would really like to hook it to to home assistant.

Opendtu solar plant - care to elaborate?

OpenDTU is an open source project using an ESP32+CMT2300A for talking to Hoymiles Micro-Inverters. Local Only.

I did some scouting about for what microinverters would be usable without a full professional install, for a small under half kilowatt playing around. I was hoping I could snap up some used enphases & try stuff out with a 200w panel & my existing batteries. But I really didn't turn up much; most discussion online made it seem like you needed special installer access to get anywhere with Enphase. Exciting to hear maybe this microinverter idea might not be totally dead in the water.