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How many Watts is the standard Alternator? by FieroRumor
Started on: 08-14-2003 11:05 AM
Replies: 5
Last post by: Pyrthian on 08-14-2003 12:10 PM
FieroRumor
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Report this Post08-14-2003 11:05 AM Click Here to See the Profile for FieroRumorClick Here to visit FieroRumor's HomePageSend a Private Message to FieroRumorDirect Link to This Post
I may be adding two 20 watt fan motors on my car...what is the rating on the standard alternator? WIll adding the two motors put a large load on the ALT?

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Steve Normington
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Report this Post08-14-2003 11:10 AM Click Here to See the Profile for Steve NormingtonSend a Private Message to Steve NormingtonDirect Link to This Post
It varies depending on what accessories you have, but it is as much as 1,500 watts peak load. Your two fans will be drawing a minimum of power from the system. For example, the HVAC blower fan uses over 120 watts at full speed.
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buddycraigg
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Report this Post08-14-2003 11:15 AM Click Here to See the Profile for buddycraiggSend a Private Message to buddycraiggDirect Link to This Post
if you have the small SI style you can get them up to 94 apms
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watts
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Report this Post08-14-2003 11:24 AM Click Here to See the Profile for wattsSend a Private Message to wattsDirect Link to This Post
Well... due to my name sake here...

It goes P=E*I
where:
P=power (watts)
E=voltage
I=current

So, 40 watts (2*20 watt fans)=12V*3.33amps

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Steve Normington
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Report this Post08-14-2003 11:56 AM Click Here to See the Profile for Steve NormingtonSend a Private Message to Steve NormingtonDirect Link to This Post
 
quote
Originally posted by watts:

So, 40 watts (2*20 watt fans)=12V*3.33amps

More like 40/14 = 2.85 since the nominal voltage of a properly running car is around 14.

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Pyrthian
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Report this Post08-14-2003 12:10 PM Click Here to See the Profile for PyrthianSend a Private Message to PyrthianDirect Link to This Post
Wouldnt worry about it. Most car stereos use more juice than that.
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