I use the Nesco/American Harvest 500 watt dehydrators. Have had them a long time. Never a problem with them. Yep,the Ronco are junk in my opinion. You can't safely trust food on them, especially would not trust jerky on them. The food can spoil before it dries.
I don't know about the 700 watt ones, but I would think they would be good.

Are there any dehydrators which work in an oven? We are off the power grid and don't have too much extra electricity to run a dehydrator. Can I just put things out on racks and set the oven to low? We have a stalk of bananas (about sixty pounds or so) getting ripe and I'd like to dry about half of them out.

Gas or electric oven?

Been a decade or so ago, but have heard wonderful results in gas oven with just the pilot light on. If in electric oven put on lowest setting and for both leave door slightly ajar.

I have done jerky in my oven. And it turned out well. I would think you could do veggies/fruit in there too.

You would just need something lay it on. With the jerky I take the strips and put a toothpick through one end then hang the toothpick crossways through the bars of the rack.

Maybe you could slice the bananas lengthwise and hang them like this too?

I had an electric oven and did leave the door slightly open. Haven't tried dehydrating in my gas oven, but mine doesn't have a pilot its electric ingitor so it would have to be on very low.

Hey! I like the idea of hanging strips of bananas between the racks. It has interesting images, although I'm not sure if they would hang together enough to stay put. I've sliced them and put them on cooling racks then on the oven racks so we will see if the pilot light in the gas oven is enough to dry the fruit. There was extra papaya, so I put some of that there, too. Wonder how many days it will take to dry? Especially since rainy season is about to start.

It is a gas oven since being off the power grid running an electric oven wouldn't be feasible unless we had a huge photovoltaic system. Since the pilot light is already there and running, we may as well get some use out of it.