I have a 2011 BH and the inverter is located in the compartment on the drivers side behind the battery compartment. It is the unit with all of the cables coming off of it (doing this from memory as my unit is in storage). Others may be of exact help. Also on the control panel on the inside, there is a "button" that you need to have pushed to turn the inverter on. Also, if I remember correctly, you can not have the generator on, when hooked to shore power, because it's will blow up the inverter - I have a post a note with this caution on the unit.
Finally completed all State visits in August 2011 with a trip to North Dakota.