Is the control panel coming on? If no could be a loose control wire, if yes see next. There is a reset on the side of the inverter, you may need to push that.
No the control panel that shows the battery life has no power, just picked the unit up on Wednesday and it's 45 miles back to the dealer, so was gonna try the easy stuff first, would you know where the inverter is located on this unit?
Look in the front storage pass through, attached to the ceiling. The control wire looks like a phone cord and may have not been plugged in tight. Also pull the control panel and check the connection on the back.