>> It might be just right. I've read 30% headroom is a good >> idea > > Okay, then it is, with +30% wiggle room at 87% efficiency, > > (ceiling (/ (* 1.30 (+ 19 125 (* 3 3) (* 2 6) 80 3 2.8)) 0.87)) > > or 375 W :) So I should get a passive 400W then. 375W - there worst-case for everything at the same time - is $ echo $(( 375 / 400.0 )) # 0.9375 only 94% of that. -- underground experts united https://dataswamp.org/~incal