A mystery to me..... [RE-wrenches]

[penobscotsolar at midmaine.com]

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Definitely, Matt. Collective experience is priceless. In my 15 years of 
installing I never saw this before, or the symptoms. I guess I can attribute 
that to paying attention to detail (stainless hardware, soldered,shrink 
tubed cables, torque wrench and quality batteries)but there's a first time 
for everything and I'm glad I had this list to turn to.
Thanks all,
Daryl
Penobscot Solar 

 


Matt Tritt writes: 

> Aren't you glad you had the urge to put your problem to the group? The best
> and least expensive of all possible outcomes. 
> 
> Matt T
> ----- Original Message ----- 
> From: <penobscotsolar at midmaine.com>
> To: <RE-wrenches at topica.com>
> Sent: Tuesday, October 21, 2003 12:39 PM
> Subject: Re: A mystery to me..... [RE-wrenches] 
> 
> 
>> Hi all,
>>   Well, the verdict is in. Sorry, it took me a day to get a KS cell so
> this
>> six hour round trip didn't have to be repeated again.
>>   I took with me a 24 v, 100 watt bulb to act as a load since I didn't
> want
>> the inverter to go into involuntary shutdown any more. After taking SG
>> readings on each cell (1.27 + for each one) and voltage readings(again) on
>> each one (2.13 - 2.15) I divided the bank into 2 24 volt banks and put my
>> load (the bulb) on the first one.It ran fine and I checked each 2 volt
> cell
>> and got almost the same exact reading as I did without the load. OK, that
>> half of the bank is good.....
>>   I next did the same with the second bank. The bulb lit up and
> immediately
>> dimmed. The fourth battery in the string, which read 2.13 v no load read
>>  -.78 v. The polarity was reversed internally.
>>   I replaced the cell, retested the bank (the bulb didn't dim) and took
>> readings on the rest of the cells. They were all fine.
>>   After tightening all connections I fired up the system and ran some
> larger
>> loads (refrig. well pump) and all was/is well.
>>   After this experience this NABCEP test this weekend is looming extremely
>> large in front of me...............
>>   Thanks for all who contributed.
>> Daryl
>> Penobscot Solar Design 
>>
>> 
>>
>> Carl Emerson, Free Power Ltd. writes: 
>>
>> > Hi gang,
>> >
>> > I have struck one bad cell going into reverse polarity and pulling the
>> > bank voltage down big time..
>> >
>> > We will soon all know I guess.
>> >
>> > Cheers
>> >
>> > Carl Emerson
>> > Free Power Ltd.
>> > Auckland NZ
>> >
>> > Jay Peltz, Peltz Power wrote:
>> >
>> >> HI all,
>> >>
>> >>
>> >> I think that its time to get the clamp on amp meter here.  You should
> be
>> >> able to pinpoint the  bad connection via that.  I do agree that the
>> >> problem
>> >> is a bad connection ( battery cable) or a bad cell..  Also you should
> be
>> >> able to increase the load and measure the voltage drop and find the
>> >> problem.
>> >>
>> >> Please keep us informed as to what it turns out to be!!
>> >>
>> >>
>> >> jay
>> >>
>> >> Peltz PowerJay Peltz, Peltz Power wrote:
>> >>
>> >
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