Our first night in our 2011 MPG we had no electrical concerns while plugged into the 30amp service. This was a small campsite with about 12 sites. The 2nd night after a couple hours of use the lights started to dim. We were at a much larger camp site the 2nd night, an RV site. Easily over 50 site and it was full. We turned everything off thru the night, and all seemed ok in the morning. I will be adding a volt meter to the camper for our next trip. To confirm, the display for the battery on the Teat panel is Low, Fair, Good and Charged, and not Charging? Is the only way to know the battery is charging is testing at the battery? Any idea why we were pulling more amps the 2nd night bs the 1st?