Electric fan amperage? - JeepForum.com
 
LinkBack Thread Tools
post #1 of 6 Old 09-22-2017, 11:13 AM Thread Starter
kycherokee1239
Registered User
2000 XJ Cherokee 
 
Join Date: Oct 2012
Location: Covington
Posts: 157
Electric fan amperage?

On a recent trip I ran into difficulties with my fan controller. I have a three fan set up with two fans wired to one lead and the third on its own. The current control module is fused at 30 amps. It controls the fans by a potentiometer (?) and a relay. The fans are rated at a draw of 5 amps each “at full speed". The controller I want to switch to is rated at 40 amps “at start-up”.

What is an estimate for how much amperage these fans draw at start-up? Even though the fan amp draw may/will be greater than 5 amps per fan, I think I am safely under 40 amps at the start and under 28 amps continuously.

Am I right?

2000 Sport. 4.0 C 8.25 LSD. 242 TC. 115,000 miles. (Just Empty Every Pocket!)


2000 Sport. 4.0 C 8.25 LSD. 242 TC. 105K miles. (Just Empty Every Pocket!)
kycherokee1239 is offline  
Sponsored Links
Advertisement
 
post #2 of 6 Old 09-22-2017, 05:18 PM
bluejunior
Web Wheeler
 
bluejunior's Avatar
2001 XJ Cherokee 
 
Join Date: Jan 2009
Location: Dallas
Posts: 6,521
Quote:
Originally Posted by kycherokee1239 View Post
On a recent trip I ran into difficulties with my fan controller. I have a three fan set up with two fans wired to one lead and the third on its own. The current control module is fused at 30 amps. It controls the fans by a potentiometer (?) and a relay. The fans are rated at a draw of 5 amps each “at full speed". The controller I want to switch to is rated at 40 amps “at start-up”.

What is an estimate for how much amperage these fans draw at start-up? Even though the fan amp draw may/will be greater than 5 amps per fan, I think I am safely under 40 amps at the start and under 28 amps continuously.

Am I right?

2000 Sport. 4.0 C 8.25 LSD. 242 TC. 115,000 miles. (Just Empty Every Pocket!)
Fans draw WAY more current at start. That said, without knowing what fans we're talking about there's really no way to talk numbers. Got a model# or anything? Brand and description to google, even?

Lifted, Locked, Stiffened

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
bluejunior is online now  
post #3 of 6 Old 09-22-2017, 07:25 PM Thread Starter
kycherokee1239
Registered User
2000 XJ Cherokee 
 
Join Date: Oct 2012
Location: Covington
Posts: 157
FF dynamics 1100 cfm fan. The only spec I can find is 5 amps at full speed. Here is the link. https://ffdynamics.com/products/ffd10

2000 Sport. 4.0 C 8.25 LSD. 242 TC. 115,000 miles. (Just Empty Every Pocket!)

2000 Sport. 4.0 C 8.25 LSD. 242 TC. 105K miles. (Just Empty Every Pocket!)
kycherokee1239 is offline  
 
post #4 of 6 Old 09-22-2017, 07:57 PM
chris87xj
JF Admin
 
chris87xj's Avatar
1987 XJ Cherokee 
 
Join Date: Sep 2006
Location: 3rd rock from sun
Posts: 11,879
I agree a 40A controller should be fine. The total startup current may exceed that, but only for a very short interval not long enough to be a factor.

***Chris***

"You can set my jeep on fire and roll it down a hill,
But I still wouldn't trade it for a Coupe DeVille."


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

chris87xj is offline  
post #5 of 6 Old 09-23-2017, 10:12 PM
bluejunior
Web Wheeler
 
bluejunior's Avatar
2001 XJ Cherokee 
 
Join Date: Jan 2009
Location: Dallas
Posts: 6,521
Quote:
Originally Posted by chris87xj View Post
I agree a 40A controller should be fine. The total startup current may exceed that, but only for a very short interval not long enough to be a factor.
Agreed^

They're not overly large, should be fine as a short spike.

Lifted, Locked, Stiffened

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
bluejunior is online now  
post #6 of 6 Old 09-24-2017, 03:22 AM Thread Starter
kycherokee1239
Registered User
2000 XJ Cherokee 
 
Join Date: Oct 2012
Location: Covington
Posts: 157
Thanks for the help!

2000 Sport. 4.0 C 8.25 LSD. 242 TC. 115,000 miles. (Just Empty Every Pocket!)

2000 Sport. 4.0 C 8.25 LSD. 242 TC. 105K miles. (Just Empty Every Pocket!)
kycherokee1239 is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the JeepForum.com forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid e-mail address for yourself.



Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome