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Unread 09-09-2011, 05:26 PM   #1
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Default Voltage drop question

I just installed one of scottyb's digital voltage meters and it looks and performs great. Only I could not help but notice what appears to be a significant drop in voltage when I accelerate. About how much voltage drop is acceptable on a flat road with fully charged batterys (50.9v)? Is this a way of telling whether you have good batterys or not?
'08 club DS w/4 12v's
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Unread 09-09-2011, 05:34 PM   #2
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Default Re: Voltage drop question

Totally NORMAL to see the voltage drop under load, in fact it's a diagnostic tool. My 48v pack will drop down to 44v on a climb or with 4 souls onboard. If a battery were "going down" this number would be much less all of a sudden.
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Unread 09-09-2011, 09:04 PM   #3
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Default Re: Voltage drop question

Thanks GORNOMAN, that is comforting to know.
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Unread 09-10-2011, 08:37 AM   #4
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Default Re: Voltage drop question

the phenomena is called Coup De Fouet and is normal for lead acid batteries. the higher the load, the more pronounced and lengthy the drop.
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Unread 09-10-2011, 03:14 PM   #5
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Default Re: Voltage drop question

That's some good information, Thanks. Also I guess if the voltage drops enough it could cause your stereo to fade out. I believe I read where others had that problem.
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