Were you using a dehydrator? You need air movement and warmth to dehydrate food. I dry my fruits and vegetables in a dehydrator at 125 degrees F (52 C). It blows air across them continuously, and they're done in about 12-14 hours, depending on how thick/big the pieces are.
You can dry food in an oven too. No air movement, though, so it might take longer. I've never done it that way, so I can't offer any suggestions. If you're going to do it in the sun, you need to keep bugs away.
I will be off grid at my new place so I am looking for the old fashioned ways to preserve food.