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i have a 3931fb with an extra battery, now 3 group 27 marine batteries. i have never had a problem traveling that the fridge is not just as cold as when i left the last rv park. at quartzite 2 years ago i would start my 3000 watt generac invertor generator a few times a day to keep the batteries charged. at night would let it run until quiet time i think was 10 oclock and then turn it off would run fridge all nite long until i was able to start it again in the a,m, i think was about 6:30 i did not want to be the first to fire up the generator but by then there was more than one going. that was all i could get out of my setup. not the best but it worked. we do not do a lot of dry camping. like i said from campground to campground never had a problem yet keeping fridge cold.
al meyer
3931fb
az
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