5 cooling units came in a bag with thermal grease and a small spatula to evenly distribute the lubricant. I tried to make the fat as thin as possible while still covering both surfaces. For the hot side, which has no printed words, I used a heatsink from an old PC microprocessor with a fan. On the cold side I used an old radiator. With this setup I was able to run the cooling unit without damaging it. I didn't know what the voltage profile would look like, so this experiment was instructive. I…