Back to the original question, like most people have mentioned you should be just fine running the lights, refrigerator, charging the batteries, TV and those items that do not require a lot of amperage to run. Most air conditioners do not fit in that category. So what would happen if you do it anyway? Might run just fine, could trip the breaker, could burn up your air conditioner (think brown out). Is it worth burning your home or RV up if the breakers don't trip? Not in my book. If your storing or using the RV at home, add a 30 amp line outside and play it safe.
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