Charging three batteries

sailman

Super Anarchist
8,327
440
Portsmouth, RI
Trying to get a handle on a battery combiner setup.  Three batteries, all wet cells, two Group 27 and one 4D.  All the combiners I have seen are for two batteries.  Is there a way to do this?

 

Kenny Dumas

Super Anarchist
1,224
465
PDX
Unless you want 3 separate banks, which would be an unusual setup, I’d wire the two matched batteries in parallel and connect to one side of the combiner while the dis-similar battery gets its own terminal. 

 

sailman

Super Anarchist
8,327
440
Portsmouth, RI
Thank you for the replies.  I will try the first suggestion with the two group 27s in parallel and the 4D on the other circuit. 

Solo, that DC-DC Converter looked pretty good as an option but how does it handle the battery when it is full?  Does it shut off or go into trickle charge?

 

Kenny Dumas

Super Anarchist
1,224
465
PDX
Make sure that the two are at similar voltage before wiring them together. Otherwise you’ll get high current flow as they seek a common voltage. Could make things get hot. 

 

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