The Outback folks can tell you exactly how the GVFX's work. They also have a forum.
I have a pair of VFX3524's. When the batteries are full, the charge controllers turn the solar panels off or at least reduce the charge to float the batteries. If you are using wind, you do have to divert power elsewhere and use it or else Murphy will be your best friend.
You might check the Outback PSX 240 auto transformer. I'm thinking it will make 20 amps unless you cool it. Could be wrong about that.
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