Yes when the AC compressor engages the fans come on to 60% you can hear it outside but it is not loud sounds about like my mazda sedan. The mechanical fan makes a LOT of noise the engine sounds a lot different with it gone! ( a good thing)

It appears this controller is under rated for this fan unit. I am going to make some more measurements and post back. Initial measurements show about 34 amps at 60% so that would put me over the limit at 100% I need to verify my measurement. I will say that judging by the airflow at 60% I don't think I will likely ever see a demand for 100%

 

Thanks. Sound like a good fan and push lots of air. However, one thing I'm not sure is having the fan ON at highway speed is necessary.

And yes keep us posted on your controller if it's going to handle the full speed or not.

 

Hi.

Nosir - Brian Baskin owns DCC ( Delta Current Control ).

http://www.dccontrol.com/

These are designed and hand-built by him - in the good ol' US of A. Brian knows more about the subject of temperature control and closed loop control systems in general than anyone I've seen. Great guy.

Recommend FK-75 with either a 10 gauge or 8 gauge loom.

BTW - in summer, in gridlock, with the A/C on, I think you may indeed hit 100%. Please keep an eye on it. Luckily, yer fuse will protect the system, ( but you will have lost cooling ).

good luck!

 

Decided to bite the bullet and add a second flexalite controller. If I override the controllers to full on the passengers side pulls 35 amps and the drivers side is around 31. So at full rate this fan unit is drawing 66 amps with a static load. I am going to stager the controller set point so the small fan turns in first then after a few degrees the larger one will start.

Painless has a controller that will not engage the fans at a set speed. I however want the fan to run if I am over set point regardless of speed. Also the painless controller turns the fans to 100% with AC.

I might setup a arduino to inhibit only the AC fan at speed later.

 

Not advocating this approach! controllers are available from Delta Current and Painless that can handle the full load of these fans together. The advantage to this setup is that I have a redundant cooling in as much as one fan could handle the load assuming one fails.

 

Hi.

Well done.

For the A/C, an Arduino would certainly be elegant, but here's a simple approach using a thermo snapswitch on the A/C condenser:

http://www.madenterprise.com/fan%20control.htm

You'd use this to trigger the 'logic' ( that's geekspeak fer a simple redneck relay, lol) to inhibit the fans when at speed and the A/C is on.


MGD

 

That's pretty elegant! Thanks for pointing out the current draw of these fans by the way.

 

Hi , and yer very welcome, sir


MGD

 

Quick question...

I'm wanting to order some for my truck and am looking at fan controllers. How are you all wiring them up? Are you wiring it up as one fan or two separate fans?

 

In my case I wired it up as two separate fans because the combined current of both fans at maximum speed was over the rated capacity of my controller ( I ended up with two controllers because of thus).

If you wire it up as one be sure to get a controller with the capacity I posted measured current draw numbers above.

Have fun!