Hi Ben! You know when you feel like a new project is coming on? I'm feeling that charger/controller combo that talks about their day over canbus. The BMS may not be necessary in the Lead Acid case. A person could buy an off the shelf generator using any fuel they wanted. I've gotten a 6kW charger working already before. It bucked down 220v to 'x', where 'x' is whatever the battery pack was. It didn't care what voltage the pack was at. It just figured it out. It was a constant current mode version used in a Thundersky bank. It was all chassis mounted components, so around $500, but I could do it for maybe $300 in parts I bet. The controller parts aren't much either.
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