if in Florida mostly, you'll have an easy time with 400w, as long as you actually have sunshine most of the day, and enough battery storage for the overnight... other threads discuss how to help 'overnight' with your residential fridge...
as for the solar amps, we just run our array down to our controller, which is in the battery compartment, and then directly to the batteries... it has no contact with the onboard Charger or other systems. The onboard Magnum charger, if we are on Shore Power or Generator, also provides any charging, but both the solar controller and onboard charger monitor the battery levels and adjust accordingly. 'Overlapping' is not an issue, as both can easily be charging the batteries, even at the same time. The solar controller will back off when the batteries don't need it, just like your charger does.
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the Turners...
two Campers, two Electric cars
former diesel pusher traveler
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