I am running 2.3 volts on the fan, near the same as the solar panel, i have it set to cut off at night to avoid messing up my sensor with too much moisture input. My shield is a 14 inch round tray with a 1 inch lip that was dark gray so no paint on bottom and painted white on top. I have been watching the temp of the fars vary as much as 1 degree between sunshine and when a cloud comes over. If you forget the temp. part of this i look at it this way the fars has a fan that dies or sticks, batteries to run at night if using solar, gets real dirty shield and filter, needs cleaning and if using solar batteries may not run all night if not getting good charge during day time because of clouds or amount of sun time available in the winter and higher latitudes. Now the Barani unique design keeps shield and sensor filter cleaner, less cleaning time, no problem with sensor getting overly wet, response seems better, the stuff the shield is made from is slick so water doesn't remain on the plates and dirt and bugs slide off, it says lol. A lot of this has to be seen in the long term and hope it all comes to pass.