So is the 100 amp sufficient enough for an electric fan?I also have a killer audio/video system that when ran with out the electric fan gets enough power to operate and the battery is still able to stay charged but as soon as the fan comes on the battery gauge goes to the red and doesnt move but maybe a centimeter or two when you rev it up.

But as i said as soon as you turn the fan off it jumps right up to the regular spot.