|ab-8b grain dryer|
This particular dryer is meant to run automatically; you'd have a "wet grain" bin on one end, with an auger into the dryer to load it. On the other side you'd have an unload auger that would move the grain into the storage bin, and this unit can turn on or off all of the required equipment.
So right now it's go get a combine full of grain, come back and load the dryer and wait about 15 minutes. The grain will settle and shrink as it dries, so for the first half-hour or so you keep feeding in grain, about another 300-400lbs until the dryer is topped-off full.
Once that's done it's off to the field again for more grain. When I get back the dryer is done with the load, have the unload auger put it into the bucket of the tractor and add it to the 'dry' grain pile in one of the barns. Fill the grain dryer, and repeat.
With a couple of bins, you'd just add the "wet" corn to the bin until it was full, and then this machine would just work all night to dry and transport the grain; in the morning you'd go out and fill the wet bin again, and repeat.
This particular dryer is about the same age as my combine; late 70s, early 80s. It's even got a couple of vacuum tubes in it; I haven't seen a vacuum tube in maybe 15 years.
Automating the drying/storing process would make harvesting a one-man operation; this size dryer will dry 120 bushels of grain in a batch, which is 3.5 tons; with load, dry, cool, unload it takes about 2.5 hours per batch; roughly 10 batches in 24 hours. So to have it work overnight the wet bin would have to be something like 600-800 bushels.