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Old 07-27-2012
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Re: Solar Conundrum

I'm thinking one set of solar panels with a nominal 48 (60?) volt output, designed to charge the motor bank. Then, add TWO MPPT controllers, one set to charge the motor battery bank at 48V, the secondset to charge the house bank at 12V.

They should have no problem co-existing with each other except perhaps some fighting over different load conditions. That's something you would want to ask the maker (Blueskies, Morningstar, Genasun) about directly to confirm.

They may suggest putting a "dumber" controller like a plain PWM on the smaller bank, or some other way to prevent altercations, but in power source, one big solar array, two separate controllers and you should be just fine. And by using MPPT you're not throwing away any power when the '12" volt one has to reduce voltage.
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