Thanks to everyone for their advice so far. Lots of ideas here and I have some troubleshooting to do. One thing - the 2 batteries are brand new AGM batteries. That's not to say it's impossible they could be the problem - but I'm hoping not! This morning I tested just the general battery power by running just the 12v appliances...and I was very satisfied... Looked like the battery levels dropped only slightly after running a number of things in the RV fora few hours. (I'm thinking the solar was doing it's job today - the sun was out a bit). The wiring / gauge seems to be an interesting theory. While Lance, the manufacturer, didn't tell me the gauge wiring they use - they do claim that I should definitely be able to use the 150W inverter with no trouble at all.
I also thought the suggestion of the 12V outlet being on the same circuit as the meters was interesting. (The meter panel is on the same wall as the outlet for which I've plugged in the inverter).
Before I wired the inverter directly to the batteries - I wanted to post pictures of the current battery configuration. Does this seem right? The batteries are wired to each other - which I'm pretty sure is correct from seeing online how to hook up 2 batteries. However, all of the other wiring is just coming off one battery - I thought seen in other diagrams online that other wiring should also be split between the two batteries? Or is it okay to be coming off of one battery, as you'll see in these pictures :
http://imgur.com/gallery/OOh6e/new
