[Author Prev][Author Next][Thread Prev][Thread Next][Author Index][Thread Index]
RE: 14.4 volts on the headlamps
You DELETED the theory part that I sent you in my private E-mail,
but just posted the last para. to the whole list.
Like I said, lamp loads on lower voltage consume less current, but not
significantly ( as in proportion to the voltage reduction ) since a lower
voltage gives a cooler filament, which has lower resistance, so
the net result is a smaller reduction in current.
And as I said, the Fan load is proportional the SQUARE of the speed,
therefore a small speed reduction gives a GREATER current reduction,
( e.g. a 10% voltage reduction would give a 20% current reduction)
but on the freeway, or on cooler days, the fan hardly every runs anyhow.
From: DeWitt Harrison [SMTP:firstname.lastname@example.org]
Sent: Friday, December 18, 1998 12:57 PM
To: Cordeiro, Alan
Subject: RE: 14.4 volts on the headlamps
So, Alan, what is your theory?
At 10:51 AM 12/18/98 -0600, you wrote:
>[ ... ]
>The alternator size depends on the maximum output current, as
>long as the voltages are about the same ( 13 volts vs. 14 volts)
>[ ... ]
>From: DeWitt Harrison [SMTP:email@example.com]
>On Thu, 17 Dec 1998 16:55:41 -0600, Alan Cordeiro wrote:
>>>Yeah I know, one of my main beefs with older BOSCH alternators
>>>used in Audis...... they seen fat dumb and happy at 13.7 or
>>Now go figger out why BOSCH alternators used in Chrysler
>>vehicles regularly give 14.2 or 14.3 volts.........
>My theory: Supplying 13.x volts instead of 14.x volts represents
>a significant power savings and permitts the use of a relatively
>small (cheap?) alternator for a given complement of electrical
>equipment. [ ... ]