|Not Quite Cold Enough|
|120MM 12 Volt "Muffin" Fan|
To get the air moving I used a computer style "muffin" fan. It's about 4" across and draws around 1/2 Amp at full speed. These are commonly available online and from local retailers. They aren't expensive at all. Mine was 7 dollars including shipping. I thought I would need some kind of bracket, but my 1"+ roof plywood and the small holes in the corner of the fan surround were sufficient to mount the fan above the fins and below the vent.
|Roof Vent Off (Wires are from Solar Panels)|
Next remove the screws holding the fridge vent on. Remove the vent and put it aside. Preferably somewhere it won't fall off the roof. Remove (carefully!) the mesh vent cover. These are designed to keep critters out. Do they really work? It will bend easily so put it aside.You may also have a thin metal plate above the cooling unit. This is a baffle to re-direct the airflow up and out. Mine was bent everywhere! I straightened it as best I could and made sure the air path to the vent was clear.
Now we figure out where you want to locate the fan.
|Close Up of Opening Showing Cooling Fins|
I put mine mostly over the fins on the cooling unit. I figure drawing air up through the chimney and across the fans will increase efficiency.
MAKE SURE THE FAN EXHAUSTS UP!!!
Otherwise, you'll have to flip it over and start the mounting procedure again.
|Fan Mounted, Wiring Done, Zip Tied, With Heat Shrink Tubing!|
Climb down. (Again?)
|Lower Fridge Vent Compartment.|
|Giant Mystery Switch (Now Fan Control)|
Since I bought my RV there has been this HUGE toggle switch in the lower fridge vent that I couldn't figure out what it was for. Now I know. It was put there for me to attach the fridge fan power lead. OK, so I really have NO idea what it was for, but it works nicely for this application. After testing this for a while in the heat, I will likely hard wire power to the fridges main power block and out to a switch INSIDE to control the fan. You could buy a thermostatic switch to turn the fan on and off with temperature, but that's another article. For now, manual control is OK for me.
With a single day of testing, it appears that I have gone from 44.9 degrees down to 35.6 degrees in the main fridge compartment, in the same outside conditions. The freezer is also down to 1 degree. I have the fridge set to a lower number on its control panel as well. It's set to 4 instead of 5. Only more testing will confirm the true value of this upgrade, but for now...I'm happy.
Be Seeing You...Down The Road,
Rich "The Wanderman"