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My Mk V has dual batteries, with the "standard" selection switch - off, 1, both and 2. When I leave the boat for the week (or two), I plug my 5 watt solar panel into the cigarette lighter outlet at the engine control panel (set into the transom in this model). I leave the battery switch on "both" with the master power switch in the on position. I am assuming that is what one has to do to have the solar panel maintain a trickle charge to keep both batteries topped up. I know that this little panel won't recharge a low battery.
What I was wondering is whether or not there is some sort of "isolator" switch that will stop one battery from "charging" the other if one is lower than the other. Anybody with more electrical knowledge and experience know?
Barry, Oasis, 1987 Mk V
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Search for the term "combiner" for various of my posts on battery combiners. A combiner senses a charging-level voltage and opens the circuit to a second battery; like an isolator, it's one-way only, but doesn't cause the voltage drop associated with isolators. This may be what you want, though you should inquire if a combiner will kick in at the low amperage of a small solar panel.
The posts are old, but the Yandina company is still around and the West article on combiners is still on the site, but you have to read the index to find it.
David Weatherston
Towser, Toronto
C&C 27 Mk IV
Last edited by (2010-05-23 00:30:27)
David Weatherston
Towser, Toronto
C&C 27 Mk IV
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