I don't have any big time stuff like that, I just have 1 deep cycle 12 volt battery and one old 12 volt system 1 battery charger, a 12 volt inverter.
I was charging one battery while I had a fluorescent 12 volt light (cheap), and evidently it couldn't take a change in charging voltlage...killed the light $1.95 shot!...so I've been under the assumtion that most everybody had 2 seperate systems 1 charging while the other was in use...I would if I were you....of course this is just my opinion and really electronic and experienced users might scoff at my notion.
Or perhaps you might need a different inverter?
Just trying to help.....awaiting answers to your question for my own reference in the future.
Have Fun!
( :>) Norm.