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Ahhh, yes - DC is harder without inserting something in-line for sure...

I used a CT-type current sensor. You can get them with different ratings. https://learn.openenergymonitor.org/electricity-monitoring/ct-sensors/interface-with-arduino Wally

Those batteries actually powered the system at -48VDC. That's why the phone system used to work even when the power was out. In the 90's I worked in an AT&T test lab that was actually the 3rd largest phone network in the world - and never carried a "real" call. Our plant typically was providing...

What about a "modular" or maybe a better word is "distributed" hybrid system? I would like to dabble in solar power...add a bit here and a bit there over time. I understand that wouldn't be the most cost-effective route. But, hear me out. I live in the country. Not way out in the boonies, but...