Because I installed the collectors at an inclination to maximize gain at winter sun angles, my daily gains are at their highest on these clear sunny December days. Temperatures (daytime) have been hovering in the low 20's, so there is plenty of capacity in my heating system to put the solar gain.
A second 30 tube bank would be great right now, but even with the high angle of my collectors lowering the summer gain and the shading of the trees, I may have excess summer capacity. I will begin measuring the daily BTU gains calculated by my Vitotronic controller and post the results.
It is 12 noon. I am running dishwashers and the washing machine. The collector is putting out 130 degrees, all going to my DHW tank. It is keeping the DHW tank hot enough to supply 125 degree water to the tap, and supressing the boiler from firing. When the DHW use is over, in about 40 minutes, the DHW tank will quickly heat up to max temp (140 degrees). Then heat will be diverted to the heating storage tank.
