Dennis batteries were dead and woke up to near freezing temps.Dennis has answered a bunch of it for me. Our RV is equipped with a pure sine wave 3000 watt inverter/converter unit, and when the factory installed it, they put in 4 batteries instead of just two. So, MOST of our electrical needs are supplied by 12V batteries. As long as we have electric to keep them charged up, we don't lose lights. Our ceiling fan and our residential refrigerator are the primary items that run only on electric. Well, except for an electric fireplace and two space heaters.
If we should lose power (hasn't happened in 2 1/2 years), then we can get a generator to recharge the batteries in the RV.
If worse were to come about, we can go to youngest son's house and set up cots near the gas fireplace to stay warm.