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Monitoring 12V Battery Current

12V Current Battery

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26 replies to this topic

#21 OFFLINE   Plus 3 Golfer

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Posted 02 April 2014 - 10:27 AM

Interesting, maybe there's a scan / check of modules every so often for another few hours.  If I understand the graph, the X axis goes from 0-280 scans and each scan is about 2 seconds so the total time is about 560 seconds or 9 minutes 20 seconds.    IIRC, on the VW procedure for checking for current drain via measuring voltage drop across fuses, the procedure has one begin the check after 2 hours so all modules are asleep.  Can you log all night? 









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#22 OFFLINE   SnowStorm

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Posted 02 April 2014 - 11:57 AM

+3,  I wasn't very clear, the logging was going at its maximum rate which was almost 2 scans each second so the total time was more like 2.5 minutes.  I'll get that axis straightened out next time.  Yes, I want to log for an extended period but I might have to settle for fewer scans/minute - I think the software limits at 10,000.  Also the meter's 9V battery will need to last all night.  If not, I guess "one dead battery deserves another"! :lol:


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#23 OFFLINE   webcontrol

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Posted 02 April 2014 - 12:30 PM

Great measurement result. This may help isolate where the problem is.  If possible, get the wire harness layout, then measure a few places at the same time, to see where this current going to.



#24 OFFLINE   Plus 3 Golfer

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Posted 02 April 2014 - 04:19 PM

+3,  I wasn't very clear, the logging was going at its maximum rate which was almost 2 scans each second so the total time was more like 2.5 minutes.  I'll get that axis straightened out next time.  Yes, I want to log for an extended period but I might have to settle for fewer scans/minute - I think the software limits at 10,000.  Also the meter's 9V battery will need to last all night.  If not, I guess "one dead battery deserves another"! :lol:

That's why I ask because I would have thought that the car might not reach sleep mode in just 2.5 minutes (and it may not have given that you saw higher readings later).

 

I think if you set the scan to once every 4 seconds, it would be sufficient to capture any changes and thus allow you to record 11+ hours. And then if there is a pattern of blips seen, you could decrease the time between scans appropriately to see what the blips look like. Or you could do it in reverse and start with a small change in time between scans and capture data for a few hours first and then extend to more hours.

 

Either way this will be very interesting to see what happens over time.   


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#25 OFFLINE   SnowStorm

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Posted 04 April 2014 - 11:52 AM

Here are results from "all night" monitoring.  Graph shows first 250 seconds of 12V battery current, positive is discharging, negative is charging.  Events shown are opening door and getting in, turning key "ON" (battery starts charging), "starting" car (Ready To Drive but ICE is OFF), turning key OFF, getting out and closing door, waiting for cuurent to drop to a low value.  (Note: Software was only logging changes in value so the exact shape would be slightly different than shown but peak values should be correct.)

 

gallery_656_57_4423.jpg

 

Overall sequence follows:

 

10:04:31 PM  Start of graph shown above

10:08:41 PM  End of graph

10:36:51 PM  Current jumps to about 3 amps for 6 seconds then back to 0.3

10:38:28 PM  Current drops to 0

1:31:16 AM    Current goes to 0.2 amps

1:32:10 AM    Back to 0

2:05:06 AM    Jumps to 0.2 again

2:06:01 AM    Back to 0

2:24:40 AM    0.2 amps

2:25:34 AM    0 amps

2:58:34 AM    0.2 amps

2:59:27 AM    0 amps

6:39:32 AM    Still 0 - End of test

 

Of course I am not suggesting that this data shows anything wrong - its a record of what happened.  It would be nice to know what "wakes up" periodically to draw 0.2 amps for about a minute, but it represents a trival drain on the battery.  The main point here is to characterize "normal" operation and then look for deviation from that norm.  We don't know if something fails to shut down after parking the car or if something wakes up at a later time and drains the battery.


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#26 OFFLINE   Plus 3 Golfer

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Posted 04 April 2014 - 03:50 PM

I agree this is great data for someone to compare their data against and it's a relatively simple procedure to collect the data.

 

How did the 9V battery in the multimeter hold up?  What multimeter are you using?  Mine is probably 15 years old or more. It might be time for a new one that can record data.



#27 OFFLINE   SnowStorm

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Posted 06 April 2014 - 08:59 PM

9V made it through two nights without a problem.  Meter is UNI-T model UT61D.  I chose it for the optically isolated data output and the 0.01 millivolt resolution on the lowest scale (most in this price range only go to 0.1).  It comes with an RS232 cable but there is supposed to be an optional USB cable available.  It seems to be an OK low cost meter but I haven't tested it much.  Bought through Amazon from RobotJoy.








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