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</head><body text="#000000" bgcolor="#FFFFFF">Thanks Dave - yes I've
done whole pack load testing. The deal with this pack though is that it
is so remote and the expense of "just replace the pack" in terms of
shipping and labor is extreme - (tiny Bahaman island with only regular
small boat access}<br>
<br>
And if it was toward the end of the pack's life anyway I'd not mess
around - but with only 600 well documented cylces on a $25K pack - and
with probably half that again in shipping and labor to replace - I'm
needing to carefully document the lagging cells for either a warranty
claim or at least to make good decisions going forward.<br>
<br>
It's easy to access the cells as this is an EnergyCell AGM stack with
easily accessible terminals and removable terminal bars.<br>
<br>
If we replace we'd go LFP - on the order of 100 KWHrs. So no small
decision for the customer - so worth the testing.<br>
<br>
Thanks!<br>
<br>
Jeff Clearwater<br>
Village Power Design<br>
<a href="http://www.villagepowerdesign.com">www.villagepowerdesign.co<span
style="color: rgb(0, 0, 0);">m</span></a><br>
<br>
<br>
<span>
</span><br>
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style="display:inline-block;white-space:nowrap;vertical-align:middle;width:49%;">
<a style="color:#485664
!important;padding-right:6px;font-weight:500;text-decoration:none
!important;" href="mailto:offgridsolar@sti.net" moz-do-not-send="true">Dave
Angelini Offgrid Solar</a></div> <div
style="display:inline-block;white-space:nowrap;vertical-align:middle;width:48%;text-align:
right;"> <font color="#909AA4"><span style="padding-left:6px">July
14, 2021 at 10:32 AM</span></font></div> </div></div>
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<meta http-equiv="content-type" content="text/html; charset=utf-8"><p>I
can ask my battery guy! He is the best with AGM and a dealer for full
river and concord. He does this alot! Saves a bunch. He always says that
most of the warranty is just a full/corrective charge and 80% are good.
Undercharging is the problem. Very very few are overcharged. His words!
I just replace the bank, no time to play with this stuff.</p>
<p>However, I just do the same thing I do with any bank of individual
batteries. I put a large load on the bank with the inverter and look at
each cells voltage. You may have done this... </p>
<p>The hard part is, depending on the make, is pulling the cell and
doing a full charge and EQ if it is the make that allows it.</p>
<p>The other hard part is just getting batteries these days. I just
heard Trojan is 8+ months out. You know what Steve from RollsSurrette
has said. 8 weeks I think.</p>
<p>The easy part, what make is your cell? </p>
<div>
<div> </div>
<div><strong><span style="font-size: small;">Dave Angelini Offgrid Solar<br>"we
go where powerlines don't"<br><a
href="http://members.sti.net/offgridsolar/" target="_blank"
moz-do-not-send="true">http://members.sti.net/offgridsolar/</a><br>e-mail
<a href="mailto:offgridsolar@sti.net" moz-do-not-send="true">offgridsolar@sti.net</a><br>text
209 813 0060</span></strong></div>
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<p>On Wed, 14 Jul 2021 10:16:31 -0700, Jeff Clearwater
<a class="moz-txt-link-rfc2396E" href="mailto:jeffc@villagepowerdesign.com"><jeffc@villagepowerdesign.com></a> wrote:</p>
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<a style="color:#485664
!important;padding-right:6px;font-weight:500;text-decoration:none
!important;" href="mailto:jeffc@villagepowerdesign.com"
moz-do-not-send="true">Jeff Clearwater</a></div> <div
style="display:inline-block;white-space:nowrap;vertical-align:middle;width:48%;text-align:
right;"> <font color="#909AA4"><span style="padding-left:6px">July
14, 2021 at 10:16 AM</span></font></div> </div></div>
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Hey Good Folks,<br>
<br>
I've got a 2300 AH AGM pack of 2 Volt cells that is showing signs of
premature aging (only 600 cycles) and I need to test the AH capacity of
each cell to help the customer make decisions going forward of whether
to replace individual lagging cells or the whole pack.<br>
<br>
What equipment have folks used to do AHour tests on 2 Volt 2300 AH
cells? I've done plenty of load testing on 6, 12, 24 and 48 volt packs
as a whole but am not sure what's my best approach is for 2 volt
individual tests.<br>
<br>
I know I could put a resistance load and then use an AHour integrator
unit - but does anyone know of what unit and what resistive load I'd use
at 2 volts? That would be a large device at that voltage to get any
appreciative wattage! - I'd like to do a 10 hour test at most.<br>
<br>
I see 2 V test units on the web but they only appear to be hooked up for
a small amount of time - so they can't be testing full to empty
discharge AHours. <br>
<br>
Thanks!<br>
<br>
Jeff Clearwater<br>
Village Power Design<br>
<a href="http://www.villagepowerdesign.com" moz-do-not-send="true">www.villagepowerdesign.co<span
style="color: rgb(0, 0, 0);">m</span></a><br>
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