did u check the condition of ur battery? the battery could be putting an extra drag on the converter if it has a dead cell.
another thought. u have been camping for over a month now. if u aren't, u need to check the water level abt once/mo to make sure it still has water in it.
seems like my battery would last abt 2 yrs. i have an optma battery now. i'll find out in a couple yrs if it was worth the money. installed it last year.
glad u electrical problem was found.