Hi MIke, Oh boy! I wish there was just a yes or no answer, but it's as varied as there are types of maples, soil substrates, climatic conditions and your watering habits/capability.
Most Japanese Maples have in indication as to their preference, shade or sun or partial. Add in your locals, like high humidity or arid, prevailing winds and of course latitude.
Be prepared to move if needed. I have a persistent westerly breeze that at times gets gusty and once in awhile kicks up pretty good, and if it's hot I better get the maples behind the house.
As a general rule I give them as much sun as they can tolerate. This changes all the time so you just have to watch them and get to know them. As conditions change their needs will too. Right now everything is out there in the sun, even six inch pots. As the season progresses all the smaller units will need to be brought out of the full day sun, the bigger can stay out longer. They will need to be moved to just morning sun once we're into summer.
It's real can of worms and you just have to sort it out according to each tree/all the above. Rick