SoundGuy wrote:
Hate to be a Debbie Downer but there's no way I'd mount any electrical device, especially in inverter, in the same closed compartment right beside a set of flooded batteries that during normal operation produce potentially explosive hydrogen gas. :E
What sound guy said is correct. The inverter should not be in the same box as the flooded batteries. It is an explosion hazard. Your outlet also needs to be covered and protected from weather/etc. It should be a GFCI outlet with proper cover on the exterior like that.