Print view
Board index ‹ Real World ‹ Autos

Car Alarms Q

With a lot of interest in Auto's here, only wingless machines please!
Post a reply

Car Alarms Q

Postby VVM » Wed Mar 19, 2008 2:16 pm

hey guys

quick question, does anyone know the power requirements of a typical car alarm?

cheers   8-)
User avatar
VVM
2nd Lieutenant
2nd Lieutenant
 
Posts: 88
Joined: Sun Aug 05, 2007 7:14 pm
Top

Re: Car Alarms Q

Postby expat » Wed Mar 19, 2008 4:14 pm

Bearing in mind that a car has a 12 volt battery under the bonnet, I think it is safe to assume......

Matt
"A bit of a pickle" - British translation: A catastrophically bad situation with potentially fatal consequences.

PETA Image People Eating Tasty Animals.

B1 (Cat C) licenced engineer, Boeing 737NG 600/700/800/900 Airbus A318/19/20/21 and Dash8 Q-400
1. Captain, if the problem is not entered into the technical logbook.........then the aircraft does not have a problem.
2. And, if you have time to write the fault on a napkin and attach to it to the yoke.........you have time to write it in the tech log....see point 1.
User avatar
expat
Lieutenant Colonel
Lieutenant Colonel
 
Posts: 8679
Joined: Tue Apr 19, 2005 3:06 am
Location: Deep behind enemy lines....
Top

Re: Car Alarms Q

Postby RichieB16 » Sun Mar 30, 2008 3:59 pm

I don't know what the requirements are...but it wouldn't be much because the alarm wouldn't be pulling hardly any current unless it was going off.  When the car is locked and the alarm active, its going to be in an idle sleep mode.  So, the current draw should be next to nothing.
User avatar
RichieB16
Major
Major
 
Posts: 3662
Joined: Thu Jan 31, 2002 11:46 pm
Location: Oregon
Top

Re: Car Alarms Q

Postby elite marksman » Thu Apr 03, 2008 10:41 pm

Car alarms can't draw all that much power, if they did, they wouldn't make them. However, that said, your car battery can store A LOT of power. The average car battery holds about 100 Amp-Hours (AH), or 10000 mAH. The current needed to power most electronics ranges from 10-100 mA, anything over 150-200 mA would simply create too much heat, especially if there is no active cooling, and would melt the pcb. So  it will take a long time for even the most demanding electronics to kill a car battery.
Last edited by elite marksman on Thu Apr 03, 2008 10:46 pm, edited 1 time in total.
elite marksman
Captain
Captain
 
Posts: 854
Joined: Tue Oct 04, 2005 7:35 pm
Top

Re: Car Alarms Q

Postby TSC. » Sun Apr 06, 2008 10:26 am

1.21 gigawatts,

No, wait - thats flux capacitor's isn't it.  :-/

TSC.
Image

'Only two things are infinite.......The Universe and Human stupidity........and I'm not too sure about the Universe' - Einstein
User avatar
TSC.
Major
Major
 
Posts: 4273
Joined: Wed Nov 03, 2004 11:11 am
Location: Torquay, Devon, England.
Top
Post a reply

Return to Autos

Who is online

Users browsing this forum: No registered users and 416 guests