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For the house batteries be sure they are deep cycle & not hybrid cranking batteries. If there's CCA, CA or MCA (cranking amps) listed on the tops they are the hybrids best for starting motors not a good choice for constant charge/discharge cycles in a RV.
For the chassis battery you want the highest number of CCAs as possible.
If you were testing battery voltage while on shore power with the batteries connected you were reading the converter output not battery voltage. Disconnect the batteries, wait about an hour then test them to find actual battery voltages or remove & take to your local auto supply store & have them load tested.
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Fulltimed 10+ years
Sold '13 Thor Redwood 36 FB
Traded '13 GMC Denali DRW D/A
Replacement undetermined
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