Q&A for How to Dehydrate Sweet Potatoes

If you keep them in an airtight container, they'll last a couple months.

I wouldn't. Sweet potatoes should be orange. If they are grey, that could indicate mold.

Yes it is. For example, I do this to make dog treats. They take a bit longer to dehydrate since they're thicker than a chip, but they work just as well.

This depends on whether or not oil is used. Any oil will decrease shelf time. I vac seal mine and store in fridge. In the absence of air, they last a long time in the fridge. Be sure there is no moisture in your potatoes before sealing them in.