27A system is alot of power. The coach comes with 1 house battery, did you order the extra or install an extra? If you have Harris brand they may likely fail early, and kill your non Harris if you added the extra battery. I have a couple Walmart batteries and a 100w panel from Home depot I set out. It kicks back about 5 amps, so does recharge well on sunny days, even get some TV time in..
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