I have a 2014 42QD and still using the original batteries. Even with the switches off the solar panel should keep the batteries charged. I’ve never let my coach go three months without checking the battery status, you should be running both the engine and generator at least every 30 days and driving the coach if possible. I suggest having the batteries tested or just skip that step and replace them. Keep them charged and they will probably last 6yrs. I’m hoping to get 1 more year out of mine.
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2014 Ellipse 42QD
2015 Grand Cherokee
2017 Street Glide Special
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