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Old 08-28-2017, 08:42 AM   #4
rwidman
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City: North Charleston, SC
Country: USA
Join Date: Sep 2010
Posts: 4,385
A combiner works just like a battery switch but it's automatic. There's no voltage drop or loss. An isolator uses diodes to separate the batteries and there's a one half volt drop. You don't want that.

Battery combiners are much more popular and are made by several different companies. I think the "under $20.00" quote above is way too low. The price for name brand marine battery combiners is more like $80 - $150 depending on capacity. Still, they are worth it.
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