I'd point out that your understanding of what a VSR does is a bit off. It doesn't start charging the second battery after the first is fully charged. It connects the TWO BATTERIES IN PARALLEL when any charging source is detected.
Some will detect charging sources one both sides, others will only work with charging sources on one side. Typically, all the charging sources are connected to the house bank side and the starting bank charges via the VSR paralleling the batteries.
Originally Posted by SlowButSteady
The latter is probably over-kill for a C22, but the VSR module would let you hook the solar panel up to one battery and have it charge both (once the first one is fully charged).
Be aware that I doubt that there is a solar charge controller that allows charging TWO banks of batteries that is reasonably priced for your application. It would make far more sense to get a good MPPT charge controller to connect the solar panels to one battery and then get a VSR/ACR/DuoCharge/Echocharge to charge the second battery whenever the solar panels are active.
I've written a basic article on Solar Power on Boats
that may be of interest to you.
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