Battery voltage - Page 2 - AudiForums.com



Audi A4 The Audi A4 model offers nimble handling and performance that makes it one of the leading cars in its class. Read more about the Audi A4 in the Audi A4 review.

Reply
 
 
 
Thread Tools Search this Thread
  #11  
Old 02-16-2006, 09:20 PM
 
Join Date: Aug 2005
Location: Brooklyn, NY
Posts: 1,561
Default RE: Battery voltage

the capacitor, you just can buy one and plug in. basically its like a reservuar, it holds charge. so when the system requires more power part can be drowen fron there.
get one like electrolitic, they are cheap. However have lots of loses. the ceramics have less loses however weak.

http://www.radioshack.com/product/in...entPage=family

http://www.radioshack.com/product/in...entPage=family

http://www.radioshack.com/product/in...entPage=family

you should get high like 50Volts and high value. get like 10 of them conect them in paralel and you done.
Reply With Quote
  #12  
Old 02-17-2006, 01:22 PM
Senior Member
Thread Starter
 
Join Date: Oct 2005
Posts: 602
Default RE: Battery voltage

Wow! those are some wierd lookin little capacitors. I might look into it.. When you say they just plug in.. where do they go?
Reply With Quote
  #13  
Old 02-17-2006, 03:35 PM
 
Join Date: Aug 2005
Location: Brooklyn, NY
Posts: 1,561
Default RE: Battery voltage

easily, they have a markings on them a black mark says the minus. then put them paralele to each other just before the power conector for your amp. It will stabilize the voltage as the amp start to work.

In my amp I have a small 220mF on the power. so instead volts jump between 8 and 6.5V it only jumps between 8 and 7.5 volts. but I have a 1W amp for my guitar working of a 9V battery and its home made.

you should get the 35V 4700mF about 10 of them, and you be fine.

Remember Paralel not in series.

Thats cheaper that the a special box from a store which does exactly the same.

and side afect, if you keep them conected, during winter when battery would be weak, they will give you a jump start. unless you put a switch on them.

ah, oh ye they are leaky, some of there charge might leak out so it may create a constant drain, but thats not a lot.

If you saw Stargate SG1 they had a person who was accended, he created a stargate, which used 7 of like big @$$ industrial capacitors, I think it was 1x10^6F dont remember exact.

[IMG]local://upfiles/10191/8494EAC751B4411ABB441B77F7A8684A.jpg[/IMG]
Reply With Quote
  #14  
Old 02-17-2006, 05:17 PM
Senior Member
Thread Starter
 
Join Date: Oct 2005
Posts: 602
Default RE: Battery voltage

Interesting, thanks for the info fellow kakster.
Reply With Quote
  #15  
Old 02-18-2006, 01:32 AM
 
Join Date: Aug 2005
Location: Brooklyn, NY
Posts: 1,561
Default RE: Battery voltage

who???
Reply With Quote
  #16  
Old 02-18-2006, 06:56 AM
 
Join Date: Nov 2005
Location:
Posts: 12,826
Default RE: Battery voltage

kaklexicon - kakarot
even I figured that one out lol

battery now there are 2 areas of importance
1. if it goes over 15 volts the battery is getting fried because the alternator brushes are worn
2. if it goes below 12 volts the battery is stuffed and alternator "could" be stuffed giving no charge out
Reply With Quote
  #17  
Old 02-18-2006, 02:29 PM
Senior Member
Thread Starter
 
Join Date: Oct 2005
Posts: 602
Default RE: Battery voltage

kaklexicon - kakarot - Exactly!

What exactly do you mean by the alternator being "stuffed"? It never goes over 15, and never goes below 12, it just moves up and down alot.
Reply With Quote
  #18  
Old 02-18-2006, 03:06 PM
6th Gear
 
Join Date: Nov 2003
Location: Columbs, Ohio
Posts: 10,684
Default RE: Battery voltage

Sounds fine to me. Everytime you turn on an electrical load the meter will dip. The voltmeter reads over 12 because that is the voltage the alternator puts out to charge the battery.
Reply With Quote
  #19  
Old 02-18-2006, 04:45 PM
 
Join Date: Aug 2005
Location: Brooklyn, NY
Posts: 1,561
Default RE: Battery voltage

actually there is a whole system behind it.
how to make it short.

okey imagine that the generator is a battery, and has a maximum output, which is like 14V and 60amps. also you have a battery which has 12V and 60amps. The total energy recuired by the system ...........


Oh man it way too long....

oh any way, when the voltage drops that means that you drow some power out of the system, the more you take, the more it will drop.

P=A*V

The reason the Volatge drops is becouse of these formula
R=V/A

when you turn sometyhing on the R increases, and becouse you already use some R and you have V and A around stable, when increases R the You take more A and less V.
P=AxV
P/A=V
R=(P/A)/A = P/(A^2)

The generator and battery is not a constant power source in which variables are same.

The electric system in cars is in series, so put more devices there and you increase the reasistons thously you increase the amps and decrease the volts.

It is Normal for volts to flactuate, however if they are jumping constantly then you have a problem. If they jump when like Bass is active, then simply ading another battery or/and capacitors could solve theproblem, but if the volts jump without apliances working then you might have blowen a diode or the faulti guage or generator's power output is wrong, or voltage stabilizer.


Reply With Quote
  #20  
Old 02-18-2006, 07:29 PM
Senior Member
Thread Starter
 
Join Date: Oct 2005
Posts: 602
Default RE: Battery voltage

Well, it does jump up and down all the time, but more when I have alot of electrical load. But it never affects anything, car runs great. Maybe I'm worrying about it too much? And I just got a brand new battery, Optima Yellow Top so I know the battery is fine.
Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
p0341 no battery voltage on cam sensors cadillacby Audi A6 0 04-23-2014 09:19 PM
Q7 Key's battery low Voltage!! Help!! deaconfrost Audi Q7 3 02-13-2014 08:21 AM
1995 Audi A6 Wont Start - New Battery Low Voltage grogo21 Audi A6 4 02-16-2010 10:10 AM
Battery Light / Voltage Problem Audi2003A4 General Tech 3 07-24-2008 11:13 PM
Can anyone look at their keyless and tell me the battery voltage ? A4 the Quattro Audi A4 9 04-09-2006 04:32 PM


Tags
18t, 2001, 2005, a4, audi, battery, car, charging, fluctuating, high, jumpstart, normal, output, proper, reading, voltage

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not 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 Off
Refbacks are Off


Advertising
Featured Sponsors

All times are GMT -4. The time now is 11:09 AM.


© 2018 MH Sub I, LLC dba Internet Brands
We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.