A build for roast your own offgrid. Below is bundt pan oven holding a pound or so of green coffee beans. The basket is rotated by 12V motor powered by one small PV panel. Hand backup as companion. TV antenna dish with foil provides heat energy. It makes some interesting coffee beans. One day the wire fell off the motor, it quit turning, and the metal screen melted, lighting the coffee beans, spilling out over the concrete. Actually they weren't that bad....