Cycling and bicycle discussion forums. 
   Click here to join our community Log in to access your Control Panel  


Go Back   > >

Electronics, Lighting, & Gadgets HRM, GPS, MP3, HID. Whether it's got an acronym or not, here's where you'll find discussions on all sorts of tools, toys and gadgets.

User Tag List

Reply
 
Thread Tools Search this Thread
Old 09-17-07, 10:22 AM   #1
KLW2
Senior Member
Thread Starter
 
KLW2's Avatar
 
Join Date: Oct 2005
Location: White Bear Lake Mn
Bikes: 88 Schwin Voyageur, 84 Schwinn World Sport, 85 Univega Alpina Uno, 85 Fuji Espree, 09 Novara Strada, 06 Jamis Durango, 03 Specialized Expediton Sport, 09 Surly LHT, 12 Novara Gotham
Posts: 758
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Lightbulb Auto or motorcycle horn current draw

Does anyone know what the typical current draw of a car or motorcycle horn is? I'm building a DIY light system using a 12v SLA 7amp battery and wonder if a horn might not fit in my plans as well...
Thanks
KLW2 is offline   Reply With Quote
Old 09-17-07, 02:13 PM   #2
seeker333
__________
 
seeker333's Avatar
 
Join Date: Feb 2004
Bikes: yes!
Posts: 3,168
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 26 Post(s)
I don't know, but they can't pull much and it's used very little, compared to light.

I expect its effect on battery life is insignificant.
seeker333 is offline   Reply With Quote
Old 09-17-07, 08:28 PM   #3
Photosmith
Recreational rider
 
Join Date: Aug 2007
Location: Phoenix, AZ
Bikes: 2007 Specialized Globe
Posts: 115
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Their website doesn't appear to permit direct linking, but Hella's Supertone horn, part number 003399051, is listed as 78 watts, which at 12v is only a 6.5 amp draw. That would squeeze in just under your 7amp battery's specified limits Of course, fact is, you can usually draw 2x of a battery's rated amperage in short bursts, but still, it is good to stay within it's rated range. That horn is a healthy 116db, which is probably plenty loud for scaring the crap out of iPod joggers on a MUP.
Photosmith is offline   Reply With Quote
Old 09-18-07, 05:40 AM   #4
KLW2
Senior Member
Thread Starter
 
KLW2's Avatar
 
Join Date: Oct 2005
Location: White Bear Lake Mn
Bikes: 88 Schwin Voyageur, 84 Schwinn World Sport, 85 Univega Alpina Uno, 85 Fuji Espree, 09 Novara Strada, 06 Jamis Durango, 03 Specialized Expediton Sport, 09 Surly LHT, 12 Novara Gotham
Posts: 758
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by Photosmith View Post
Their website doesn't appear to permit direct linking, but Hella's Supertone horn, part number 003399051, is listed as 78 watts, which at 12v is only a 6.5 amp draw. That would squeeze in just under your 7amp battery's specified limits Of course, fact is, you can usually draw 2x of a battery's rated amperage in short bursts, but still, it is good to stay within it's rated range. That horn is a healthy 116db, which is probably plenty loud for scaring the crap out of iPod joggers on a MUP.
Thanks Photosmith!
KLW2 is offline   Reply With Quote
Old 09-18-07, 09:52 AM   #5
Map tester
I am not a car
 
Map tester's Avatar
 
Join Date: May 2004
Location: Decatur, GA
Bikes: Giant Revel 1, Surly Ogre
Posts: 747
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I have been using a standard car replacement horn from the auto store for years and had no problems. My battery now is a 3.6 Ah SLA (3 lbs), down from a 7 Ah (6.15 lbs), then to a 5.5 Ah SLA (4.33 lbs) (went all LED lights). The horn comes in very handy, especially when people are backing out and not looking carefully! I use a car replacement horn button inside a section of old inner tube for wet weather protection.
__________________
"Bad facts make bad laws." FZ
Map tester is offline   Reply With Quote
Old 09-18-07, 06:43 PM   #6
KLW2
Senior Member
Thread Starter
 
KLW2's Avatar
 
Join Date: Oct 2005
Location: White Bear Lake Mn
Bikes: 88 Schwin Voyageur, 84 Schwinn World Sport, 85 Univega Alpina Uno, 85 Fuji Espree, 09 Novara Strada, 06 Jamis Durango, 03 Specialized Expediton Sport, 09 Surly LHT, 12 Novara Gotham
Posts: 758
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by Map tester View Post
I have been using a standard car replacement horn from the auto store for years and had no problems. My battery now is a 3.6 Ah SLA (3 lbs), down from a 7 Ah (6.15 lbs), then to a 5.5 Ah SLA (4.33 lbs) (went all LED lights). The horn comes in very handy, especially when people are backing out and not looking carefully! I use a car replacement horn button inside a section of old inner tube for wet weather protection.
Map tester,
Have you been using a Relay with the switch or just battery, switch, horn in series?
Keith
KLW2 is offline   Reply With Quote
Reply


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



All times are GMT -6. The time now is 08:17 AM.