<p>We ran the field test XW pro here AC coupled to test function and programming in AC coupling. Used a Schneider grid inverter and it all worked fine. A good set-up for a large grid or micro grid install.</p>
<p>I still do not get why someone with a medium/small offgrid (less than 14KW or so) system would want to add all of the complexity and get so little in return? Love the picture of the AGM ! Respect it please! If you get a lightning strike nearby and the failsafe fails! Just sounds like you are giving the client a headache to me. Convince me why for offgrid please?</p>
<pre><strong><span>Dave Angelini Offgrid Solar
"we go where powerlines don't"
<a href="http://members.sti.net/offgridsolar/" target="_blank">http://members.sti.net/offgridsolar/</a>
e-mail <a href="mailto:offgridsolar@sti.net">offgridsolar@sti.net</a>
text 209 813 0060</span></strong></pre>
<p>On Sun, 3 Nov 2019 20:44:51 -0700, Ray <ray@solarray.com> wrote:</p>
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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:6a08ead76f907a9c600ad44b89168e2c@sti.net" 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.</p>
<pre class="moz-signature">Ray Walters
Remote Solar
303 505-8760</pre>
<div class="moz-cite-prefix">On 11/3/19 6:40 PM, jay wrote:</div>
<blockquote type="cite" style="padding-left:5px; border-left:#1010ff 2px solid; margin-left:5px; width:100%"><!-- meta ignored --> Hi mark,
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<div>Not quite.</div>
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<div>The BB will keep charging unregulated until the battery voltage reaches high battery voltage cutout set point.</div>
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<div>jay</div>
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<div>peltz power</div>
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<div>On Nov 3, 2019, at 5:05 PM, Mark Frye <<a href="mailto:markf@berkeleysolar.com">markf@berkeleysolar.com</a>> wrote:</div>
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<p>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?</p>
<div class="moz-cite-prefix">On 11/3/2019 4:56 PM, Glenn Burt wrote:</div>
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<div dir="auto">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>
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<div dir="auto">-Glenn</div>
<div dir="auto">Sent from my 'smart'phone, so please excuse typos and spelling errors.</div>
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<div dir="auto">------ Original me</div>
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