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Looking for some advice on an existing setup. On a boat with a DIY hybrid system which is working but the two parts are isolated. I have a 48v bank with up to 2 kw Regen and a 12v house bank with a ~1kw alternator charge source (boat diesel). Looking to charge both banks when one charging source is active.
Thinking to use the diesel ignition to control a contactor to switch between - engine on, 12 to 48 mode, - engine off, 48 to 12 mode
Going from 48 to 12, figured a large solar mppt charger would work?
12 to 48 seems more complicated... would I need to boost the voltage and then use a 48v mppt charger?
 
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