How to check "output" of a battery charger?? - Steve Saunders Goldwing Forums

 2Likes
  • 1 Post By MaynardGKrebbs
  • 1 Post By DBohrer
 
LinkBack Thread Tools
post #1 of 7 (permalink) Old 08-26-2019, 07:30 PM Thread Starter
Member
 
BLUTHUNDR31's Avatar
 
Join Date: Aug 2017
Location: Morgan Hill, CA.
Year: 1991
Make: Honda
Model: GL1500 Interstate (Cinnamon/beige)
Posts: 332
How to check "output" of a battery charger??

I have a couple old battery chargers in the garage that will be put out for the garage sale.



I want to check these chargers to make sure they work. Can I plug them in to 120VAC and use the DVM (on volts) to check the "output", , ,or will that blow the DVM fuse?


I'm not real sharp about some electronics, , sorry if its a dumb question.
BLUTHUNDR31 is online now  
Sponsored Links
Advertisement
 
post #2 of 7 (permalink) Old 08-26-2019, 07:54 PM
Member
 
MaynardGKrebbs's Avatar
 
Join Date: Sep 2018
Location: Indiana
Year: 2004
Make: honda
Model: gl1800
Posts: 44
Garage
The DVM would be fine on a 20 volt scale. But I wouldn't try to check amperage. Just hook up the charger to a good battery, then check voltage across the terminals. With the charger on and with it off. Any voltage reading above actual battery voltage would indicate that it is charging. The higher the voltage, the higher the current. A battery maintainer or trickle charger may only raise the voltage to 13.5, where a 20-30 amp charger may raise it to 14+ volts. A fully charged battery should show 12.7 after the surface charge has drained off. When you see the voltage rise with the charger on shut it off, and watch the battery voltage drop to resting voltage, eventually reaching @12.7.
DBohrer likes this.

MGK
MaynardGKrebbs is offline  
post #3 of 7 (permalink) Old 08-26-2019, 08:53 PM Thread Starter
Member
 
BLUTHUNDR31's Avatar
 
Join Date: Aug 2017
Location: Morgan Hill, CA.
Year: 1991
Make: Honda
Model: GL1500 Interstate (Cinnamon/beige)
Posts: 332
Thanks Maynard, , , ,I'll try that


Is there any method WITHOUT using a car battery in the process??
If the battery charger is "selectable" between 6Amps and 10 Amps, is there a way to measure each to see what they're actually putting out?
BLUTHUNDR31 is online now  
Sponsored Links
Advertisement
 
post #4 of 7 (permalink) Old 08-26-2019, 09:08 PM
Member
 
MaynardGKrebbs's Avatar
 
Join Date: Sep 2018
Location: Indiana
Year: 2004
Make: honda
Model: gl1800
Posts: 44
Garage
Amperage it a measurement of "load", the battery is the load for the charger. As voltage from the charger increases so would the load. This happens untill the battery becomes more charged, when the battery voltage increases load (amperage) decreases. Amperage will vary withe battery size and state of charge/discharge.

Some chargers have voltage controls with different settings for maintenance free or deepcycle batteries. But the ones in the 6-10 amp range are generally just a transformer and a rectifier.


There is a way to measure what you want, but it would require an ammeter. Your DVM may have this, but would be at the limit of its capacity at 10 amps. Meter would have to be in series with the load.

MGK
MaynardGKrebbs is offline  
post #5 of 7 (permalink) Old 08-26-2019, 09:38 PM
Keeper of the Bookmarks / Moderator
 
AZgl1800's Avatar
 
Join Date: Oct 2006
Location: Oologah, Indian Territory, USA...
Year: 2002
Make: Honda
Model: GL1800 Hot Rod Yellow
Posts: 56,968
Garage
I have a 300 amp shunt that I used for years, hook it to a battery and measure the volts across the shunt ( it has a special resistor for that ).

for a charger?
get a couple of old headlight bulbs, use them for a load.

~ John


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.



To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
AZgl1800 is offline  
post #6 of 7 (permalink) Old 08-26-2019, 09:45 PM
Senior Member
 
DBohrer's Avatar
 
Join Date: Aug 2009
Location: Silver Spring, Maryland, USA
Year: 1967
Make: BSA Royal Star
Posts: 3,248
Quote:
Originally Posted by AZgl1800 View Post
I have a 300 amp shunt that I used for years, hook it to a battery and measure the volts across the shunt ( it has a special resistor for that ).

for a charger?
get a couple of old headlight bulbs, use them for a load.
The Amp-U-Tron (digital amp/volt meter) on my bike measures volts and amps via a shunt connected to the negative battery post.
AZgl1800 likes this.
DBohrer is offline  
post #7 of 7 (permalink) Old 08-27-2019, 11:49 PM Thread Starter
Member
 
BLUTHUNDR31's Avatar
 
Join Date: Aug 2017
Location: Morgan Hill, CA.
Year: 1991
Make: Honda
Model: GL1500 Interstate (Cinnamon/beige)
Posts: 332
I had four different battery chargers that were "garage-sale" material. Three of the four were checked while charging a battery and tested out as "working". The fourth one is now living in the dumpster because I couldn't get it to charge.



Thanks for the comments/help with this. Much appreciated
BLUTHUNDR31 is online now  
Reply

  Steve Saunders Goldwing Forums > Forums > General Motorcycle Discussion Forum

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Steve Saunders Goldwing Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



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 On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome