During this past Dec, I was finding my solar input being a little lower than I needed to feed my DP3. I have the portable 160w and the 220w. Spec wise the 220w was more close so up it went. Most of us Ecoholics tell new users that these portable panels arent meant to be permeantly. Well these panels have been out there since Dec. I'm happy to report that they have been working great and survived the fires.