I have a 2011 RB 50 with solar and Tripp Lite. I had nothing but problems keeping the OEM battery charged on trips. They finally died and a battery shop suggested I install two golf cart batteries. Over 3 years I have been amazed how much better these have performed. I have had the batteries discharge to zero on several occasions on the road but they return to normal with hook-up to my 110v home or RV park charge.
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