Yep, I'd put them back in. I ran mine for several days before they finally got somewhat crispy. Then I stuck them in the freezer in a glas jar and they got even more crispy. Not as much as commercial chips, but much better.
"Usually, the chips are produced from underripe bananas, of which slices are deep-fried in sunflower oil or coconut oil, which are then dried, and to which preservatives are added. These varieties of chips can be very oily, due to the deep-frying process.
Another form of fried banana chips, usually made in Kerala (India) and known locally as 'upperi', is fried in coconut oil. Both ripe and unripe bananas are used for this variant. Sometimes they are coated with masala or jaggery to form both spicy and sweet variants. It is an integral part of the traditional Kerala meal called sadya served during weddings and traditional festivals such as Onam." http://en.wikipedia.org/wiki/Banana_chips
Yeah...it does look like the ones you buy are fried
I used very ripe bananas,when I dehydrated mine and they did turn nice and crispy. But then when I used them in my homemade trailmix, they softened up and became a little leathery. but they still taste good.