I dry my woodchips on a large tarp in the sun. I turn them once a day and simply pull the tarp over them before the humidity of the evening sets in. (This reduces the tarp’s footprint to half). The next morning I pull the tarp back to full size and rake the chips back across it. 3 days usually gives me chips that are 12% moisture or less. I used to dry the chips before I classified them, but now I classify (sort) them before drying, so I am not drying chips that I won’t be using anyway. Then, since it is easy to do, I sort them a second time.
See the first couple of minutes of this video to see what how I lay them out:
See minutes 2 to 3 of this video for a larger tarp setup and for an in-building method that I use as needed:
You will note that I changed the 1 inch X 1/2 inch “good chip” screen to a 1 inch X 1 inch screen since the earlier video.
To measure after-drying moisture content of my chips, I (net)weigh a 5 quart ice cream pails’ worth of chips, heat them on a cookie sheet in the kitchen oven to 250°F for about an hour, check weight, do it again, check weight until no change, then compare before and after weights. My goal is 12% or less.