Ok Matt: What you say makes sense...BUT....All 4 of my panels have stickers on them that tell which end is supposed to go where, and which sides are "inlet" and "outlet". We have them set up as per manufacturer's directions, so we are a bit confused. This is a REAL SORE subject between DH and me, but he says he will try and help me figure it out over the weekend. I will have him read your posts tonight, and perhaps he will try a different setup with the soalr. Thank you so much for the tips! At this point, i will try anything!