How long are you charging your batteries?
I have a four year old Interstate that has been put through the mill with all the testing and dry camping we have done. Then again before and after each trip it comes home and goes on a auto charger for three days. It will hold its top charge for days afterwards.
Any more it has the good life with the solar. It sits in float most the day and is fully charged when nightfall comes. We run a few LED lights, watch some TV and run the furnace, the resting voltage in the morning is 12.57v on a summer day, 12.4v when it's cold. We like it at 65 degrees at night so the furnace runs some when it's below freezing. We have dry camped three day without charging. Used the truck and jumper cables, used the generator and cruddy converter, nothing has caused it to take a dive or disappoint me.
