With nothing to do here in Nac but wait for service on Monday and a temperature of 100 degrees (according to the FOT reader board), I decided to run an experiment to determine how well the electronics bay cooling fan works.
I hung a wireless temperature sensor in the middle of the bay (see attached photo) and waited for the temperature to stabilize with the fan on. Temperature stabilized at 111.2 degrees.
Turned the fan off and the temperature stabilized at 113.4 degrees.
Turned the fan back on and the temperature stabilized at 111.2 again.
So, it appears the fan does provide some cooling - about 2 degrees.
Not very significant, in my opinion.
Jim
I found that to be true also. It seems like the inverter fan is running all the time when it is that hot out.
I believe it is because it has no place to draw fresh cooler air from except the center cable trough.
I am experimenting with a fan between bays under the inverter. It has helped some.
It's pretty hard for just a fan to do much cooling when the outside temperature if 100 or more. Seems to me that drawing that cool air from the interior of the coach (cold air from the a/c tends to fall, after all) might be best. Our main inverter, which is only 1600 watt (pure sine) is in the cupboard under the refrigerator on our '93 U225. It's easy to keep that cupboard open when we want to use the inverter (which is not "on" all the time... only when needed, actually).
Craig