<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /></head><body style='font-size: 12pt; font-family: Verdana,Geneva,sans-serif'>
<p><span style="font-family: 'Lucida Grande', Verdana, Arial, Helvetica, sans-serif; font-size: 12px;"> <span style="font-size: 12pt;">Hey Michael, </span></span></p>
<p><span style="font-size: 12pt;"><span style="font-family: Lucida Grande, Verdana, Arial, Helvetica, sans-serif;"><span style="font-size: 12pt;">The screenshot from the June Webinar is max for split phase. I have not done one yet but Eric Bentsen says the Back-up control switch that Schneider sells works well and no imbalance. I would say call him but he is in Vegas at the RE+ tradeshow.</span></span></span></p>
<p><span style="font-size: 12pt;"><span style="font-family: Lucida Grande, Verdana, Arial, Helvetica, sans-serif;"><span style="font-size: 12pt;"> </span>Definitely<span style="font-size: 12pt;"> not outdoor rated! Surprised that someone would do that with a big system. I would stay DC coupled always for Offgrid but Eric says it is now supported with the sensors in the BCS. Nice to have Insight Cloud showing the whole system.</span></span></span></p>
<p><span style="font-size: 12pt;"><span style="font-family: Lucida Grande, Verdana, Arial, Helvetica, sans-serif;"><span style="font-size: 12pt;">Does anyone ever specify the right loads for Offgrid anymore? Not directed at you BTW.</span></span></span></p>
<p><span style="font-size: 12pt;"><span style="font-family: Lucida Grande, Verdana, Arial, Helvetica, sans-serif;"><span style="font-size: 12pt;">Good Luck!</span></span></span></p>
<div id="signature">
<pre><strong><span style="font-size: small;">Dave Angelini Offgrid Solar
"we go where powerlines don't"
<a href="http://members.sti.net/offgridsolar/" rel="noopener"> </a><a style="color: blue; font-size: 11px; font-family: 'Lucida Grande', Verdana, Arial, Helvetica, sans-serif; font-weight: 400; background-color: #ffffff;" href="https://offgridsolar1.com/" rel="noopener noreferrer"><span style="font-size: 12pt;">https://offgridsolar1.com/</span></a><a href="http://members.sti.net/offgridsolar/" rel="noopener"> </a>
e-mail <a href="mailto:offgridsolar@sti.net">offgridsolar@sti.net</a>
text 209 813 0060</span></strong></pre>
</div>
<p><br /></p>
<p id="reply-intro">On 2023-09-18 10:12 am, Michael Morningstar via RE-wrenches wrote:</p>
<blockquote type="cite" style="padding: 0 0.4em; border-left: #1010ff 2px solid; margin: 0">
<div id="replybody1">
<div dir="ltr">I've been asked to build a back up system for a grid connected estate. We haven't done many of these and I thought it best to ask those who have some questions before I go about reinventing the wheel.
<div> </div>
<div>Here's the existing infrastructure.</div>
<div>1) 400amp Metered Main Distribution Panel with six 200amp feeders to various sub-panels on the property</div>
<div>2) 400amp ATS and 100kw Kohler rapid response generator </div>
<div>3) 20kw ground mount array with (2) SE Inverters located at the array. Feeder from array is 1,000 ft to Service. Six years old and wiring is janky.</div>
<div>4) Data logging for the last year shows peak demands of almost 40kw. This could increase as several of formerly vacant guest residences could be occupied.</div>
<div> </div>
<div>My go to is almost always Schneider, however in this instance when I looked into a quad stack, or more It seems like some type of controller is needed to prevent imbalanced current passing through the relays during transfer. That left me a bit concerned. Has anyone successfully stacked 4 or more XWPROs?</div>
<div> </div>
<div>Then there is the matter of AC or DC coupling? I really want no part in having anything to do with SE. The inverters are already looking pretty weathered taking the brunt of the prevailing winds and storms (they are mounted to one of the ground mount poles). Seems like a great waste to pull out the 4/0 feeders and replace strings. My other hesitancy with AC coupling is that we would lose PV monitoring and control.</div>
<div> </div>
<div>I've also considered Sol Ark 15's, like three of them. We've got some SA systems under are belt now and the only thing I can say that I like is the speed of installation and the 200amp pass through. Other than that, they leave me uninspired. One very large system continues to have glitches that SA just shrugs their shoulders about. If we were to do three 15's, <u>what's the preferred combining method?</u> All that I can come up with is a custom 400a panelboard w/ three 200a breakers. </div>
<div> </div>
<div>Price is not a consideration for this project. The new owners of this property (which is plagued with outages) have tasked me with building something that is ultra reliable and good take over in a situation where the grid is no longer available.</div>
<div> </div>
<div>Any suggestions or tips are appreciated.</div>
<div> </div>
<div>Michael</div>
<div>
<div> </div>
<span class="v1gmail_signature_prefix">-- </span><br />
<div class="v1gmail_signature" dir="ltr">
<div dir="ltr">
<p style="margin: 0px; font: 18px Helvetica; min-height: 22px;"> </p>
<p style="margin: 0px; font: 18px Helvetica;">Michael Morningstar</p>
<p style="margin: 0px; font: 18px Helvetica;"> </p>
<p style="margin: 0px; font: 18px Helvetica;">Morningstar Electric</p>
<p style="margin: 0px; font: 18px Helvetica;">PO Box 1494</p>
<p style="margin: 0px; font: 18px Helvetica;">Mount Shasta, CA 96067</p>
<p style="margin: 0px; font: 18px Helvetica;">530-921-0560</p>
<p style="margin: 0px; font: 18px Helvetica;"><a href="mailto:mjmorningstar@gmail.com" rel="noreferrer">mjmorningstar@gmail.com</a></p>
<p style="margin: 0px; font: 18px Helvetica;"><img src="/tuxedo/?_task=mail&_id=180315285165088ed713409&_action=display-attachment&_file=rcmfile1695059671049310300" width="200" height="118" /></p>
</div>
</div>
</div>
</div>
</div>
<br />
<div class="pre" style="margin: 0; padding: 0; font-family: monospace">_______________________________________________<br />List sponsored by Redwood Alliance<br /><br />Pay optional member dues here: <a href="http://re-wrenches.org" target="_blank" rel="noopener noreferrer">http://re-wrenches.org</a><br /><br />List Address: <a href="mailto:RE-wrenches@lists.re-wrenches.org">RE-wrenches@lists.re-wrenches.org</a><br /><br />Change listserver email address & settings:<br /><a href="http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org" target="_blank" rel="noopener noreferrer">http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org</a><br /><br />There are two list archives for searching. When one doesn't work, try the other:<br /><a href="https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/" target="_blank" rel="noopener noreferrer">https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/</a><br /><a href="http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org" target="_blank" rel="noopener noreferrer">http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org</a><br /><br />List rules & etiquette:<br /><a href="http://www.re-wrenches.org/etiquette.htm" target="_blank" rel="noopener noreferrer">http://www.re-wrenches.org/etiquette.htm</a><br /><br />Check out or update participant bios:<br /><a href="http://www.members.re-wrenches.org" target="_blank" rel="noopener noreferrer">http://www.members.re-wrenches.org</a><br /><br /></div>
</blockquote>
</body></html>