| Re: Electric Radiator Fans: Practical cooling from the mens mall to your coach! Part II [message #90798 is a reply to message #90770] |
Fri, 02 July 2010 07:05   |
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Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
Karma:
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| Duce Apocalypse wrote on Thu, 01 July 2010 23:16 |
Well I finally got a current meter and was able to get some draw readings for my electric fan setup, and wouldn't you know they pull 60 amps on the nose when they go full tilt! the problem is my controller is rated to only 45 amps so this means one fan is gonna have to be tripped by relay which will be triggered by the VSC, so it will survive extended 100% duty cycle use as would be encountered when the AC is on or when in the desert.
I also will have to update the alternator, when I ran the headlights, AC blower motor on high and fans I maxed out the punny 80 amp alt and began pulling power from the battery, that is of course unacceptable, so I managed to get a recently remanufactured CS144 out of a 95 Caddy and its 140 amps, paid $30 for it at the mens mall and also got the 7 or so feet of 6 gauge charge wire with the alt for free. so hopefully I will put that in the coach this weekend, as well as get pix and video up on the net. I have a buddy from Stuttgart Germany visiting tomorrow so perhaps we'll crack a bier and get'er done...
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Duce,
Since you go to a 140 amp alternator and actually have means to run it near full load, please plan on going to a dual belt.
In recent years, I have put more than a few high load alternators in cruising boats. Every single one that could run over 100 amps and did, had very short (sometimes flash) belt life. Then I had to go back and pick one:
Reprogram the controller (many have microprocessor controlled regulators) to restrict the load,
Slow the alternator by installing a larger sheave (also reduces peak load capability) or
Making it dual belt or poly-V drive (seldom a practical choice because of room or parts availability).
The only thing better than learning by your mistakes is learning from the mistakes of others.
Please try to create some educational successes we can work from.
Matt
Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit
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