I watched the video. By what he is saying about dissipating 10 watts at 10 v and 1 amp. If it has a heat sink that big and it still gets that hot to burn you and the fet is at 244F degrees. I would not trust ever having a mosfet for a dump load . And also to let you know. My system right now has no battery tie. I feed the little one into the 22-60 GTI and the big one into the 10.8-30 GTI. Then the disconnect goes between the two. So when the fets burned out only the little pma was on the 22-60 GTI that burned out the fets. The 10.8-30 volt GTI is still on the external dump system and I have not had a problem with it since I changed the system.