Robert Bruninga via EV wrote:
I was going to use a simple 12v inverter to 120 VAC and then 2 diode, 2 capacitor voltage doulbler to 330 VDC at 600 mA or so max, straight to the Volt battery. No activation of Volt's BMS. Safety is provided by a pushbuton activation latch that can only be turned on when I know there is room in the battery for 4 miles or more and sun is shining. When the sun goes down, the latch falls out and any subsequent days, will not activate unless I push the button when there is the 4 miles range available at the top. So all I need to find is the tap point directly to the battery before the contactors. Fuses and diodes will also be used.
That should work as well. If you use a halfwave doubler circuit (the one with a series capacitor in one AC leg), it has an intrinsic current limit, defined by the value of that capacitor.
I like your idea of an automatic shutoff. When I've done "bad boy" chargers like this, I've included a spring-wound timer that shuts it off after X hours. That way if I forget, it still turns itself off.
Just be careful! Make it as fool-proof as you can (because fools can be so darn clever). As Marco says, there are lots of opportunity for mistakes in this setup!
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