The factory panel is a maintainer not charger. It will barely keep the house batteries charged if they are fully charged and the disconnect is opened. I have never had it keep up all the batteries. Even with brand new fully charged batteries. Btw we bought our 06 new in 07.
I just disconnect the chassis ground when in storage.
Ray, Cheryl, O'Connell and of course Miss Molly Silky Terrier mix
2006 Dolphin 5355