Wiring a shunt/ammeter into a 24v DC charger


  #1  
Old 11-05-17, 06:00 PM
D
Member
Thread Starter
Join Date: Nov 2017
Location: Canada
Posts: 2
Received 0 Votes on 0 Posts
Wiring a shunt/ammeter into a 24v DC charger

I have a home made 24 V DC charger using an alternator run by an old snowmobile motor. It is used to charge my battery bank of my solar system during those poor sun days of November.
I recently purchased on EBay a digital display with a 100 Amp shunt which I would like to insert in line to record the charge in amps. I am currently using the charger at idle speed so as not to create too much current, and am using a computer fan to cool the alternator.
Can anyone tell me how to wire this. Thanks
 
  #2  
Old 11-05-17, 06:19 PM
PJmax's Avatar
Group Moderator
Join Date: Oct 2012
Location: Jersey
Posts: 70,055
Received 2,952 Votes on 2,664 Posts
Welcome to the forums.

Model numbers or a picture would be good for confirmation.

Basic wiring of a shunt and ampmeter

Name:  shunt.jpg
Views: 5641
Size:  18.6 KB
 
  #3  
Old 11-05-17, 07:02 PM
F
Member
Join Date: Mar 2006
Location: Wet side of Washington state.
Posts: 18,495
Received 36 Votes on 28 Posts
Shunts are normally wired into the negative conductor. This is especially true of the Chinese units and combination meters available on ebay.

Check out this page. https://www.google.com/search?q=wiri...w=1056&bih=652
 
  #4  
Old 11-06-17, 11:41 AM
PJmax's Avatar
Group Moderator
Join Date: Oct 2012
Location: Jersey
Posts: 70,055
Received 2,952 Votes on 2,664 Posts
Personal preference. The amp meter will work in either plus or minus path.
 
  #5  
Old 11-06-17, 03:19 PM
T
Member
Join Date: Oct 2005
Location: USA
Posts: 1,784
Received 68 Votes on 64 Posts
Neg side monitor is prefered in a car, due to potential shorts to frame. In large plastic boats, I see a lot of + side monitoring.
I just did some shunt wiring last week for industry and it was in the pos side of an ungrounded 125V dc system that fed 20A motor.
 
  #6  
Old 11-06-17, 06:22 PM
F
Member
Join Date: Mar 2006
Location: Wet side of Washington state.
Posts: 18,495
Received 36 Votes on 28 Posts
IF it is just a simple analog ammeter then yes, it WILL work in either lead.

BUT, the original poster stated: I recently purchased on EBay a digital display with a 100 Amp shunt...

The wiring on every single Chinese-made DIGITAL ammeter I have seen, and I have seen several, REQUIRED the shunt to be in the negative lead due to the wiring for the DIGITAL meter power. Check out the link to the Google page I had included.
 
  #7  
Old 11-06-17, 07:03 PM
PJmax's Avatar
Group Moderator
Join Date: Oct 2012
Location: Jersey
Posts: 70,055
Received 2,952 Votes on 2,664 Posts
Yes.... I see your point. I have seen these types of meters before and they are trouble. Here's two notes they've posted to the user.

  • Common ground design,the ammeter can only series connection between the test equipment negative and the test equipment power supply negative
  • Recommend to use a separate isolated power supply
 
  #8  
Old 11-08-17, 05:30 PM
D
Member
Thread Starter
Join Date: Nov 2017
Location: Canada
Posts: 2
Received 0 Votes on 0 Posts
Thanks

Many thanks to the members who stepped up to help me out. Sorry for the delay in responding, had phone problems
 
 

Thread Tools
Search this Thread
 
Ask a Question
Question Title:
Description:
Your question will be posted in: