I've noticed that solar generators are pulling over 500-600 watts when Darkness has the player's view essentially pitch black (in clear conditions,) i.e., the game's idea of when it's dark and what Darkness is establishing appear slightly offset. Since there doesn't seem to any time variables or code in Darkness, I'm guessing the only hope for improving that state would be a tweaking of the NightEdge and/or Dusk values?