[RE-wrenches] Voltage discrepancy

[Drake Chamberlin]

boB,

Thanks,  I will check all connections when I get out there.  Is there 
anyway a loose connection could cook the batteries?

Thanks,


Drake


At 03:16 PM 8/14/2010, you wrote:
>Drake Chamberlin wrote:
>>I called her back just now, and the voltage readings on the Mate, 
>>MX and Trimetric all match.  Humm.
>>
>>The batteries are 4, 4 1/2 year old, U.S. Battery L-16s wired in 24 
>>volt configuration.  It seems that I remember postings of Wrenches 
>>having problems with these batteries.  There is about 1 KW STC of 
>>PV on the roof.
>
>Might want to be careful of loose connections.  Maybe the MX was 
>putting out some high(ish) current and there
>was a voltage drop across that connection, and now they are reading 
>the same because the current is
>lower from the MX.  i.e.  high voltage at the terminals of the CC 
>and lower at the actual battery terminals.
>
>boB
>
>
>
>
>
>>
>>At 12:12 PM 8/14/2010, you wrote:
>>>Any way she can get a real voltmeter?  the MX60 has voltage 
>>>calibration, so does the FX  it sounds like something is over 
>>>charging, perhaps the generator run?   additonal details on 
>>>battery bank size, array size and typical load.  Darryl
>>>
>>>--- On *Sat, 8/14/10, Drake Chamberlin 
>>>/<drake.chamberlin at redwoodalliance.org>/* wrote:
>>>
>>>
>>>     From: Drake Chamberlin <drake.chamberlin at redwoodalliance.org>
>>>     Subject: [RE-wrenches] Voltage discrepancy
>>>     To: "RE-wrenches" <re-wrenches at lists.re-wrenches.org>
>>>     Date: Saturday, August 14, 2010, 8:58 AM
>>>
>>>     Hello Wrenches,
>>>
>>>     I just got off the phone with an off grid system owner who has a
>>>     voltage discrepancy showing between the reading on her MX-60 and
>>>     both her Mate and Trimetric meter.  The MX-60 shows 28.8 V and
>>>     the Trimetric and the Mate both show around 25 volts.  The
>>>     batteries are using a tremendous amount of water.
>>>
>>>     Has anyone seen this scenario before?  Do you think the MX-60 is
>>>     bad?
>>>
>>>     Thanks,
>>>
>>>     Drake Chamberlin
>>>     Athens Electric
>>>     OH License 44810
>>>     CO License 3773
>>>     NABCEP TM  Certified PV Installer
>>>     Office - 740-448-7328
>>>     Mobile - 740-856-9648
>>>
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>>
>>Drake Chamberlin
>>Athens Electric
>>OH License 44810
>>CO License 3773
>>NABCEP TM  Certified PV Installer
>>Office - 740-448-7328
>>Mobile - 740-856-9648
>>
>>------------------------------------------------------------------------
>>
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>
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Drake Chamberlin
Athens Electric
OH License 44810
CO License 3773
NABCEP TM  Certified PV Installer
Office - 740-448-7328
Mobile - 740-856-9648  
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