im about to pick up my old saz 3500 back today, running my saz 2k right now at .67 and it gets luke warm, voltage drop down to 12's at times, 220 amp alt, 3 big batteries, big 3. So we will see how the 3500 does at that. But my sax 125.2 gets retarded hot in the summer time, i could cook an egg on it, so i added fans in for this year, and jacob said if it doesnt go into thermal protect. its fine!