Charleen, if you're living in your trailer, using heat, lights, possibly the water pump and the refrigerator, you are using battery power to run the fans for the heat and refrigerator and for the other items I listed. You will have to have some source of battery charging power to keep things going. The obvious and easiest way is to plug in to "shore power". This will activate your onboard converter which will keep the battery charged, if it is working. I have another thread in the forum that gives you troubleshooting ideas for a converter that is not charging the battery.
If you don't have access to shore power, you will need to use a generator to keep the battery up. You can purchase an inverter generator at places like Costco, Home Depot or Lowes for less than $500 that should do the trick and they are pretty quiet. Another alternative is solar panels, but you will need a setup that can produce at least 200 Watts to keep you comfortably charged.
Hi-Lo 1707T - Tire Minder TPMS on Tow Vehicle and Trailer, 300W Solar Battery Charger, Equal-i-zer WDH
2014 F150 Platinum 4x4 3.5L EcoBoost SCrew