Starcool draining second battery
Hello there! I hope I am not the first person in the forum to have this problem...
I have a 93 Sportsmobile (Ford E-250) that drains the secondary battery completely within less than two hours when we hook up to 110 volts. The rest of the stuff (refrigerator, lights, etc) can run for days without draining the secondary battery if I hook up to 110.
When I drive the van the Starcool blower has no negative effect on the second battery - in fact, even if I run the van on idle with the Starcool on Medium, the alternator still generates enough amperage to charge the second battery fully withing a couple of hours. Last weekend I ended up idling the van in the middle of the night for about two hours to run the AC and stay alive in the heat until the morning.
I am wondering if my 45 Amp converter is just too weak, or if the 12 volt AC blower under the refrigerator is hooked up wrong? The blower and AC works fine for about 1.5 to 2 hours and then when the blower speed gets low, the 110v compressor no longer kicks in.
Fortunately we replaced a defective battery isolator a while back, so our starting battery is not drained. However, no AC makes it hard to camp in South Texas in the summer! We tried camping in hot weather only twice since we have the Sportsmobile, and we are determined not to do it again until we fix this problem.
Thanks for any pointers!