Well I see no one is responding to this (yet) so lets start the ball rolling.......I don't have a 50Amp service in my coach and I don't have an inverter/charger system either, but my basic understanding of them is that when you are plugged into a correctly operating 50Amp campground AC service your inverter should default to the campground AC and also should be charging your coach/chassis batteries as required. When the CG AC or Generator AC sources shutoff the Inverter supplies the AC loads (those wiored to the inverter at least) via the Coach battery string. So maybe I missed something in your description, but it seemed like you were saying that when on the CG service your AC devices browned out and your batteries were not charging?
So how stable is the campground AC system? Any other campers on 50A service complaining of recent power fluctuations? If not then perhaps you have an intermitant operational issue with your inverter charger transfer switch or control systems.
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