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<p>Here's a pic of an AGM battery bank that went into thermal run
away. Core temp was at over 200 F. If you over charge a sealed
battery for long enough, with high enough charge current and don't
have adequate cooling......</p>
<p><img src="cid:part1.C36FB33A.0894F94B@solarray.com" alt=""
width="997" height="482"></p>
<p>You definitely want a relay to disconnect the GT inverters, in
case frequency shifting isn't working. With a large enough array
and small battery bank, you can over shoot battery voltage really
quickly and start damaging the batteries. I've seen just
milli-amps push an AGM battery to 64 v, once it reaches full
charge.<br>
</p>
<pre class="moz-signature" cols="72">Ray Walters
Remote Solar
303 505-8760</pre>
<div class="moz-cite-prefix">On 11/3/19 6:40 PM, jay wrote:<br>
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<blockquote type="cite"
cite="mid:354F3667-5F9C-4CFB-BC83-ED711AF64731@gmail.com">
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Hi mark,
<div class=""><br class="">
</div>
<div class="">Not quite.</div>
<div class=""><br class="">
</div>
<div class="">The BB will keep charging unregulated until the
battery voltage reaches high battery voltage cutout set point.</div>
<div class=""><br class="">
</div>
<div class=""><br class="">
</div>
<div class=""><br class="">
</div>
<div class="">jay</div>
<div class=""><br class="">
</div>
<div class="">peltz power</div>
<div class=""><br class="">
</div>
<div class=""><br class="">
<div><br class="">
<blockquote type="cite" class="">
<div class="">On Nov 3, 2019, at 5:05 PM, Mark Frye <<a
href="mailto:markf@berkeleysolar.com" class=""
moz-do-not-send="true">markf@berkeleysolar.com</a>>
wrote:</div>
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<p class="">OK, great, I am really getting the message,
but I would like to understand, if for some reason the
BB does not raise the frequency or the GT does not
response, or the BB fails to stop on HBCO the ultimate
consequence is unregulated charging of the battery
until failure?<br class="">
</p>
<div class="moz-cite-prefix">On 11/3/2019 4:56 PM, Glenn
Burt wrote:<br class="">
</div>
<blockquote type="cite"
cite="mid:taftg8rde8aokb0beouq2f3n.1572828719717@email.lge.com"
class="">
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<div style="font-size: 10pt;" class="">
<div dir="auto" class="">Indeed, as long as nothing
goes wrong with the BB inverters ability to shift
the freq, and the GT's ability to follow the UL
1741 requirements, nothing bad should happen.
However it is best practice to have a secondary
method in place to ensure the GT drops out of the
picture. That most commonly is ensured with an
interposing relay controlled by the BB inverters
knowledge of the battery charge, or a secondary
device that performs the measurement.</div>
<div dir="auto" class=""><br class="">
</div>
<div class="">
<div dir="auto" font-size:9pt;"="" class="">-Glenn</div>
<div dir="auto" font-size:9pt;"="" class="">Sent
from my 'smart'phone, so please excuse typos and
spelling errors.</div>
</div>
</div>
<div style="font-size: 10pt;" class="">
<div id="LGEmailHeader" dir="auto" class="">
<div dir="auto" class=""><br class="">
</div>
<div dir="auto" class="">------ Original me</div>
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