Joe! You and your fancy P loop! hehe. Awesome job! I think you might be right about agms. Very low internal resistance. I can't wait to see if you blow something up! This is so exciting! A charger that can go up to 20 amps isn't cheap. Manzanita 20amp chargers are like $2000 I think. So, if you can keep the DIY parts price below, say... $1500, I would say you are doing a huge service to the EV community! I have a bunch of 220uF 450v ripple caps and high voltage mosfets and igbts that someone sent me, and I want to make a charger like your fancy one! ya!
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