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09-09-2011, 04:26 PM | #1 |
Gone Fishing
Join Date: Aug 2011
Location: The Pee Dee, S.C.
Posts: 752
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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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09-09-2011, 04:34 PM | #2 |
Stay thirsty my friends!
Join Date: Jan 2007
Location: Suburban Chicago
Posts: 24,291
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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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09-09-2011, 08:04 PM | #3 |
Gone Fishing
Join Date: Aug 2011
Location: The Pee Dee, S.C.
Posts: 752
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Re: Voltage drop question
Thanks GORNOMAN, that is comforting to know.
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09-10-2011, 07:37 AM | #4 |
Gone Wild
Join Date: Oct 2010
Location: Panama City, FL
Posts: 1,408
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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.
-sj |
09-10-2011, 02:14 PM | #5 |
Gone Fishing
Join Date: Aug 2011
Location: The Pee Dee, S.C.
Posts: 752
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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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