Join Date: Feb 2000
Location: Green Cove Springs, FL
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You might want to reconsider
your plans AAGE. You said you have 210ah Gel batteries and want to put a 40ah AGM for your starting batteries.
The charge rate voltage is different for GELS and AGM batteries. GEL cells must be charged at a lower voltage (2/10th's less) than flooded or AGM batteries. If overcharged, voids can develop in the gel which will never heal, causing a loss in battery capacity.
You could use a combiner that uses diodes, with the voltage drop across th diodes you should be below the 14.1 volt charge rate that will kill a GEL in short time. Now the problem is, your AGM will never get a full charge. But AGM's are less expensive than GEL's.
The call is yours to make, I don't know is there is a combiner with 2 voltage outputs.