Pump now turns on exactly when the collector becomes hotter than the tank top
Today’s plot (below) shows a cloudy day that shows only moderate solar gain that does not fully offset the water usage for the day. (Each drop in the blue line is a cloud blocking the sun). Keep in mind that the water entering this pre-heat tank comes from my well which is about 60F. Any temperature exiting this tank that is significantly above 60 is a net solar gain that reduces the need for propane to heat the regular water tank up to 100F.
Note that the pump now turns on exactly when the collector becomes hotter than the tank top. I moved the sensor that runs to the Differential Temperature Controller so that it can respond appropriately to the tank temperature rather than turning on (as above) based on the temperature of the lower part of the tank.
Average tank temperature 89.365F
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Tomorrow we continue