Thread: Batteries info
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Old 12-04-2020, 09:52 AM   #10
Chuck v
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Join Date: Dec 2009
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When you say coach battery, we presume you mean the starting battery.


The general recommendation for diesel coach starting batteries from the engine manufacturers is two group 31 batteries in parallel, each with at least 1150 CCA.

I have read somewhere that Cummins recommends a minimum of 1300 CCA, and then only if starting temps are 40 degrees or above. Reliable starting in cold weather requires more capacity. You an get adequate capacity with a single 8D diesel starting battery, but that will occupy at least as much space as two each group 31 batteries and cost more -- plus it will be massive and difficult to handle, weighing at least 180 lbs and measuring 20.8 x 11.1 x 9.8”

My Tour Master coach came with two each group 31 starting batteries, and I am sure yours did too.


If you really meant HOUSE battery, then those should be two each deep cycle 12 volt batteries in parallel (usually group 27...)



Chuck
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