First, solar units do not work at night........ I just installed a 1100 cfm fan in the garage to exhaust to the attic. Fan was equipped with a thermostat that I have set at ~95 degrees, I was in the garage today, and the indoor/outdoor thermometer I have installed in the attic was showing 104 degrees at the peak when the fan went on. Temperature dropped bay almost 15 to 20 degrees when the fan kicked on. NOTE: the thermostat is located near the fan, much closer to ceiling level, so it needs to be set lower then the temperature level at the roof peak. Fan runs until attic is cool.
Hope this helps.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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