the12volt.com spacer
the12volt.com spacer
the12volt.com spacer
the12volt.com spacer
icon

low voltage trigger


Post ReplyPost New Topic
< Prev Topic Next Topic >
wireman121 
Member - Posts: 2
Member spacespace
Joined: June 27, 2003
Location: United States
Posted: January 28, 2008 at 5:01 PM / IP Logged  

Here is my delema:

I am looking to design a low voltage trigger.  The purpose of this would be when the vehicle's voltage reaches a preset value (lets say 9.0V) it will close a switch, and send 12V+ to a trigger wire.

The trigger wire will be attach to the 12V+ input trigger of a remote start module.  The purpose of this would be in the event that a light is left on, or something else draining the battery, before thhe battery completely dies, this module will trigger the remote start to engage, and of course charge the battery back up.  I found 1 voltage sensor here http://www.tessco.com/products/displayProductInfo.do?sku=466627&eventPage=1 but it isnt exactly what I was looking for, and I'd rather make my own, but i obviously need a little help.

Any help is appreciated

techman93 
Silver - Posts: 591
Silver spacespace
Joined: October 28, 2006
Location: Pennsylvania, United States
Posted: January 28, 2008 at 10:32 PM / IP Logged  
I am wondering how you would start vehicle on less then 12 volts. Normally a vehicle starts very hard if voltage is under normal. I think it would kill battery all together due to trying to crank requires more voltage then 9 volts and so if it did start it would run for preset time and die again if unattended. Say you go on vacation and you have a voltage drain in your car. It would constantly turn car on every time voltage reached a set point and charge back up over and over again, I think that will cause fatigue on battery and reduce life of cells and what if your car expends all the gas in the fuel tank? What would you do to prevent that?
The wire I'm test'n isn't doin' what it's supposed to be doin'... I am so glad I printed that tech sheet, with the wrong info.
Do it right the first time... or I might have to fix it for ya
brcidd 
Copper - Posts: 274
Copper spacespace
Joined: January 07, 2005
Location: Ohio, United States
Posted: January 29, 2008 at 8:22 AM / IP Logged  

not to mention- that this car may sometime be in a garage- in a home- with the door down---

The better solution is the old "battery buddy" - a device that attaches to your battery that when voltage drops below 12 volts are so- that the box- switches off (unhooks) your battery- then when you try to start it up- it automatically re-connects your battery- when you turn the key- very simple install-  all automatic-- had one on the wife's van when my daughter used to leave map lights on- saved her numerous times-- of course any newer vehicle now have this battery saver cicuitry built into them......

Brcidd - Engineer That Does Remote Starter Installs on the side.
ralphtonka 
Member - Posts: 30
Member spacespace
Joined: December 20, 2007
Location: Alberta, Canada
Posted: January 29, 2008 at 9:19 PM / IP Logged  
the rs would shut down if voltage fell to 10.5 v while cranking. get the battery buddy!
Chris Luongo 
Platinum - Posts: 3,746
Platinum spaceThis member consistently provides reliable informationspace
Joined: May 21, 2002
Location: Massachusetts, United States
Posted: February 03, 2008 at 12:40 PM / IP Logged  
wireman121, still here?
http://www.autospeed.com/shop/category_579/browse.html
About halfway down the page, check out "universal voltage switch."
KPierson 
Platinum - Posts: 3,527
Platinum spaceThis member consistently provides reliable informationspace
Joined: April 14, 2005
Location: Ohio, United States
Posted: February 03, 2008 at 6:33 PM / IP Logged  
You would be better off designing something that would disconnect the parasetic load rather then trying to start the vehicle.  OEM setups cut all power to interior accessories ~15 mintues after the ignition has been shut off, this prevents interior accessories from killing the battery.  It wouldn't take much more to add the headlights to the scheme.
Kevin Pierson

Sorry, you can NOT post a reply.
This topic is closed.

  Printable version Printable version Post ReplyPost New Topic
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot delete your posts in this forum
You cannot edit your posts in this forum
You cannot create polls in this forum
You cannot vote in polls in this forum

  •  
Search the12volt.com
Follow the12volt.com Follow the12volt.com on Facebook
Thursday, March 28, 2024 • Copyright © 1999-2024 the12volt.com, All Rights Reserved Privacy Policy & Use of Cookies
Disclaimer: *All information on this site ( the12volt.com ) is provided "as is" without any warranty of any kind, either expressed or implied, including but not limited to fitness for a particular use. Any user assumes the entire risk as to the accuracy and use of this information. Please verify all wire colors and diagrams before applying any information.

Secured by Sectigo
the12volt.com spacer
the12volt.com spacer
the12volt.com spacer
Support the12volt.com
Top
the12volt.com spacer
the12volt.com spacer