I am doing the dehydrating this yr..real big..just about everything..I have been dehydrating banannas. I slice them,,, run them thru, btl'ed lemon juice put them in dehydrator..let dry..they don't last long ,around here..lol hagd.
You asked about cranberries in the first post... I have dried them, but unless you cut them open, it takes a very long time in the dryer. I'm going to dry some rhubarb this week, first time, if there's enough after I make some rhubarb BBQ sauce. It should dry about like celery does.
I dip mine in lemon juice and there is just a slight lemon taste if that does sit well with you orange juice works just as well but either way you need something to keep them from browning and fruit fresh is kinda spendy
Freeze your bananas and slice them using a mandolin to get thinner and more crisp slices. This also cuts down the drying time A LOT. Dipping them in Sprite is the same as dipping them in lemon water or any other diluted citrus juice. It is the citric acid that keeps it from browning.