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Jan 31, 2013, 08:57 AM
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Discussion

Measuring discharging output from charger


I saw somewhere on how to check the actual mah the charger is drawing from the battery during a discharge by putting a voltmeter in between the batt and chrgr. I have seached hi and lo and can't find it again. There was a diagram for the pig tail and I can't recall the details. I think it was actually a calibration check for the charger. If anyone can help I would really appreciate the feedback. I have a accucyle elite and a 306b that I would like to check to see what is actually being pulled from the batt.
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Jan 31, 2013, 09:55 AM
Registered User
Why not just put a watt meter between the charger and battery?

Though you have to remember anytime you do a check like this it's only as accurate as the device measuring it.
Jan 31, 2013, 10:38 AM
Registered User
I don't have a wattmeter(yet) but I have an Fma DVM shunt that when connected with a dvm in between a battery and motor will show the amps a motor pulling. I would guess that might work.
Jan 31, 2013, 10:39 AM
Registered User
Quote:
Originally Posted by lynn1953
I don't have a wattmeter(yet) but I have an Fma DVM shunt that when connected with a dvm in between a battery and motor will show the amps a motor pulling. I would guess that might work.
Yep that will work. The charger is no different from a motor, they are both discharging the battery.
Jan 31, 2013, 10:49 AM
Registered User
A shunt / DMM will register current (mA, A) but has no ability to record capacity (mAh, Ah).
Jan 31, 2013, 10:56 AM
Registered User
Thanks, I I thougth it was logical but I didn't want to let the smoke out of something
Jan 31, 2013, 11:10 AM
Southern Pride
everydayflyer's Avatar
Quote:
I saw somewhere on how to check the actual mah the charger is drawing from the battery during a discharge by putting a voltmeter in between the batt and chrgr.
Any decent charger with a LCD dispaly will show the mAh removed from the battery during a discharge jusr rge same as they show mAh delivered to the battery during a charge.


See graph and text here

https://www.rcgroups.com/forums/atta...mentid=4165842

Note charge stated at Storage Level.

Charles
Last edited by everydayflyer; Jan 31, 2013 at 11:20 AM.
Jan 31, 2013, 11:39 AM
Registered User
Thanks Charles. I was just curious if the chargers would match close to what the charger was telling me. What is bugging me more than anything is how I can stumble across something doing a search and can never seem to retrace my search to find it.
Jan 31, 2013, 11:59 AM
Registered User
LOL..I have a whole book of bookmarks on stuff I stumble across.


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