Voltage drop question

8-point · 09-09-2011, 04:26 PM

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

gornoman · 09-09-2011, 04:34 PM

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.

8-point · 09-09-2011, 08:04 PM

Thanks GORNOMAN, that is comforting to know.

sonicj · 09-10-2011, 07:37 AM

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

8-point · 09-10-2011, 02:14 PM

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.

09-09-2011, 04:26 PM	#1
8-point Gone Fishing Join Date: Aug 2011 Location: The Pee Dee, S.C. Posts: 752	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

09-09-2011, 04:34 PM	#2
gornoman Stay thirsty my friends! Join Date: Jan 2007 Location: Suburban Chicago Posts: 24,290	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.

09-09-2011, 08:04 PM	#3
8-point Gone Fishing Join Date: Aug 2011 Location: The Pee Dee, S.C. Posts: 752	Re: Voltage drop question Thanks GORNOMAN, that is comforting to know.

09-10-2011, 02:14 PM	#5
8-point Gone Fishing Join Date: Aug 2011 Location: The Pee Dee, S.C. Posts: 752	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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