Add the berries, banana and kiwis to your blender with a little bit of the apple juice to help it blend. Your goal here is to get a nice puree that you can spread on the sheets. If it is too chunky, and small amounts of the fruit juice, but be careful to not get it too thin.
Dehydrate at 135 degrees for 6 to 8 hours. The center is the last part to cook, which you can poke at to see if it has cooked all the way.