My slide rule says you should get between 8 - 12, with so many variables though ?? I would have the battery fully charged then run everything for the day with the panel providing the juice then at end of day shut everything down and 10 mins later see what the battery state is, the practical view is always better than the theory, if the battery is in pretty good shape with everything running then you should be laughing, sometimes the view on paper is never what it's like in the real world. I've actually never checked what my portable job does , it keeps things charged so I don't worry, it's only 80w. Oh always do a battery check about 10 mins after you shut down the loads gives a better picture.
I'm no electric guru so please point out my error's gentlemen................
