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Re: Monster electric cooling fan upgrade. long. w/photos.
[Re: moparx]
#3244761
07/15/24 04:33 PM
07/15/24 04:33 PM
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Joined: Oct 2007
Posts: 3,953
Oregon
hooziewhatsit
master
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master
Joined: Oct 2007
Posts: 3,953
Oregon
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I have a 50A reset-able fuse on mine (I have more available). Though, I've never had it run at full speed long enough to stress it, so  are you using a PWM unit to control your fan ? wouldn't one of those units help to prevent the sudden amp spike when the fan is energized ?  Yep, I designed and sell the controller used to control the fan. Though your comment does bring up a feature I somehow never considered   If the ignition is turned on and the engine is hot enough to command for full speed, it currently commands 90% (full speed) immediately. Or, should I command 25% -> 50% -> 75% -> 90% over several seconds, to reduce the inrush. I should hook up my test bench & fan again and do some testing. It could be that the fan is smart enough internally to do that already  It sounds like the issue at hand is long term amperage draw melting the fuse/holder. Startup current doesn't affect that.
If you ever find yourself in a fair fight, your tactics suck.
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Re: Monster electric cooling fan upgrade. long. w/photos.
[Re: hooziewhatsit]
#3244870
07/16/24 12:45 AM
07/16/24 12:45 AM
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Joined: Dec 2003
Posts: 24,691
Capital of Narcissism
jcc
No soup for you!!!
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No soup for you!!!
Joined: Dec 2003
Posts: 24,691
Capital of Narcissism
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I have a 50A reset-able fuse on mine (I have more available). Though, I've never had it run at full speed long enough to stress it, so are you using a PWM unit to control your fan ? wouldn't one of those units help to prevent the sudden amp spike when the fan is energized ? Yep, I designed and sell the controller used to control the fan. Though your comment does bring up a feature I somehow never considered If the ignition is turned on and the engine is hot enough to command for full speed, it currently commands 90% (full speed) immediately. Or, should I command 25% -> 50% -> 75% -> 90% over several seconds, to reduce the inrush. I should hook up my test bench & fan again and do some testing. It could be that the fan is smart enough internally to do that already It sounds like the issue at hand is long term amperage draw melting the fuse/holder. Startup current doesn't affect that. Wouldn't any minimal shut off delay also be helpful in reducing the next starting high engine temp situation so fan can start slower because of the lower engine temp?
"absence of evidence does not equate to evidence of absence of effect."
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Re: Monster electric cooling fan upgrade. long. w/photos.
[Re: carrman]
#3245643
07/18/24 11:50 PM
07/18/24 11:50 PM
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Joined: Jan 2003
Posts: 28,159
Irving, TX
feets
OP
Senior Management
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OP
Senior Management
Joined: Jan 2003
Posts: 28,159
Irving, TX
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No cheesy fuse holders here now!! Glad you got it worked out. Still, what kind of monster have I created? The thread is still chugging along 14 years later.
We are brothers and sisters doing time on the planet for better or worse. I'll take the better, if you don't mind.
- Stu Harmon
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Re: Monster electric cooling fan upgrade. long. w/photos.
[Re: feets]
#3245722
07/19/24 12:55 PM
07/19/24 12:55 PM
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Joined: Sep 2003
Posts: 21,066
north of coder
moparx
Buying your homeless and unwanted bolt on battery terminals
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Buying your homeless and unwanted bolt on battery terminals
Joined: Sep 2003
Posts: 21,066
north of coder
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No cheesy fuse holders here now!! Glad you got it worked out. Still, what kind of monster have I created? The thread is still chugging along 14 years later. just shows the staying power of [very] useful information. 
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