<div dir="ltr">I assume it works only because the inverters are sync'd in a leader/follower(s) coordinated relationship.<div><br></div><div>But I've certainly had problems getting the full (additive) power out of multiple Sol-Arks (for example).  </div><div><br></div><div>Blake</div></div><br><div class="gmail_quote gmail_quote_container"><div dir="ltr" class="gmail_attr">On Wed, Feb 4, 2026 at 3:31 PM Jason Szumlanski via RE-wrenches <<a href="mailto:re-wrenches@lists.re-wrenches.org">re-wrenches@lists.re-wrenches.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div dir="ltr"><div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif">Hi all,</div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><br></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif">When backing up a 400A service with multiple paralleled all-in-one inverters by combining the AC inputs and outputs, the individual inverter transfer switches must operate in a synchronized manner. Come to think of it, the same thing applies to backing up 200A service with paralleled inverters. Are these tested for this function? – I assume so.</div></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><br></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif">I'm really asking because Sol-Ark seems to be the only brand that specifically addresses 400A service in documentation, although not very clearly in the manual itself. Their training and literature support passing through additive grid pass-through with multiple inverters, which implies that they are additive in their ability to transfer power. See attached examples.</div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><br></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif">I have not found anything from EG4 (for the 18kPV) or the Midnite AIO that specifically addresses this. </div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><br></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif">In other words, how can we assume that paralleled inverters will be additive in terms of their ability to transfer high levels of current that exceed the rating of a single unit? Is that even addressed in listings? The documentation is quite poor from all manufacturers (no surprise there!)</div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif"><br></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif">I do have a couple of grid-interactive Midnite AIO systems with four paralleled AIOs backing up 400A services, and so far, so good. My engineer signed off on that.</div><div><br></div><div><br></div><div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif">Jason Szumlanski</div><br></div><div><br></div><div><div dir="ltr" class="gmail_signature"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><b><div style="text-align:center"><table border="0" cellpadding="0" cellspacing="0" style="color:rgb(34,34,34);font-weight:400;text-align:start;font-family:"helvetica neue",helvetica,arial,sans-serif"><tbody><tr><td rowspan="2"><a href="http://www.floridasolardesigngroup.com/" style="color:rgb(17,85,204)" target="_blank"></a></td></tr></tbody></table></div></b></div></div></div></div></div></div></div></div><img width="0" height="0" alt="" style="display: flex;"></div>
</div>
_______________________________________________<br>
List sponsored by Redwood Alliance<br>
<br>
Pay optional member dues here: <a href="http://re-wrenches.org" rel="noreferrer" target="_blank">http://re-wrenches.org</a><br>
<br>
List Address: <a href="mailto:RE-wrenches@lists.re-wrenches.org" target="_blank">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" rel="noreferrer" target="_blank">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/" rel="noreferrer" target="_blank">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" rel="noreferrer" target="_blank">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" rel="noreferrer" target="_blank">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" rel="noreferrer" target="_blank">http://www.members.re-wrenches.org</a><br>
<br>
</blockquote></div><div><br clear="all"></div><div><br></div><span class="gmail_signature_prefix">-- </span><br><div dir="ltr" class="gmail_signature"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div><span style="color:rgb(136,136,136)"><br></span></div><div><div dir="ltr" style="color:rgb(136,136,136)"><div dir="ltr"></div></div><span><p dir="ltr" style="line-height:1.38;margin-top:12pt;margin-bottom:12pt"><span style="font-size:12pt;font-family:Arial;color:rgb(0,0,0);background-color:transparent;font-weight:700;vertical-align:baseline;white-space:pre-wrap">Blake Gleason, PE | Employee Owner</span><span style="font-size:12pt;font-family:Arial;color:rgb(0,0,0);background-color:transparent;font-weight:700;vertical-align:baseline;white-space:pre-wrap"><br></span><span style="font-size:11pt;font-family:Arial;color:rgb(0,0,0);background-color:transparent;vertical-align:baseline;white-space:pre-wrap">Director of Innovation and Technical Excellence<br></span><span style="font-size:11pt;font-family:Arial;color:rgb(0,0,0);background-color:transparent;vertical-align:baseline;white-space:pre-wrap">O: 510-845-2997 x128</span><span style="font-size:11pt;font-family:Arial;color:rgb(0,0,0);background-color:transparent;vertical-align:baseline;white-space:pre-wrap"><br></span><span style="font-size:11pt;font-family:Arial;color:rgb(0,0,0);background-color:transparent;vertical-align:baseline;white-space:pre-wrap">C: 510-867-5878</span></p><div style="color:rgb(34,34,34)"><font color="#000000" face="arial, sans-serif"><a href="http://sunlightandpower.com/" style="color:rgb(17,85,204)" target="_blank"><img width="211" height="109" src="https://ci3.googleusercontent.com/mail-sig/AIorK4yjk0tWxLYJdmm8ixByIvVlZ8qHwp7MBdjlqQNVO7hj39UcwfDd-aKPNU5cBLNHLCKqOqC-w-9FROD8" alt="sunlightandpower.com" style="margin-right: 0px;"></a><br></font></div><div style="color:rgb(34,34,34)"><font face="arial, sans-serif"><br></font></div><div style="color:rgb(34,34,34)"><font face="arial, sans-serif"><a href="https://linktr.ee/SLP_Socials" style="color:rgb(17,85,204)" target="_blank"><img width="152" height="28" src="https://ci3.googleusercontent.com/mail-sig/AIorK4wmYY0xXFzX-5yuRXvlOjP9uoFrUg4y1unXDQvTBQr5HVpFDvICelbuEoFiS7A5OgrP9l9BZg76XfMB" style="margin-right: 0px;"></a><br></font></div><div style="color:rgb(34,34,34)"><font face="arial, sans-serif"><br></font></div><div style="color:rgb(34,34,34)"><font color="#000000" face="arial, sans-serif">1035 Folger Ave.</font></div><div style="color:rgb(34,34,34)"><font color="#000000" face="arial, sans-serif">Berkeley, CA 94710</font></div><div style="color:rgb(34,34,34)"><a href="http://www.sunlightandpower.com/" style="color:rgb(17,85,204)" target="_blank"><font face="arial, sans-serif">www.sunlightandpower.com</font></a></div><div style="color:rgb(34,34,34)"><font color="#000000" face="arial, sans-serif">License #326203</font></div><div style="color:rgb(34,34,34)"><font face="arial, sans-serif"><br></font></div><p dir="ltr" style="line-height:1.38;margin-top:12pt;margin-bottom:12pt"><span style="font-size:11pt;font-family:Arial;color:rgb(0,0,0);background-color:transparent;vertical-align:baseline"></span></p><div style="color:rgb(34,34,34)"><font face="arial, sans-serif"><a href="https://benefitcorporationsforgood.com/" style="color:rgb(17,85,204)" target="_blank"><img width="75" height="75" src="https://ci3.googleusercontent.com/mail-sig/AIorK4zNQnLwwA2Gfw-r6Z26JjX-0mPWU3DAfpN9q1TYxOilMCJROy3kEKcfAW6arJoJ3mxp0vPD6WZUXCcN" style="margin-right: 0px;"></a> <a href="https://www.amicussolar.com/" style="color:rgb(17,85,204)" target="_blank"><img width="107" height="64" src="https://ci3.googleusercontent.com/mail-sig/AIorK4zKriewlV0wT2ND5dRYfEXBEecnnLnjY2QJld2uXi95WOSRJxqD2atMe60r9ESy-AUZZYDJf3YzW989" alt="https://www.amicussolar.com/" style="margin-right: 0px;"></a> <a href="https://calssa.org/" style="color:rgb(17,85,204)" target="_blank"><img width="136" height="45" src="https://ci3.googleusercontent.com/mail-sig/AIorK4x_pi6qJbETKHrniRlikSghWRw1ZhF64UNkTmIpyZYVyu2Ls_JzgxRzHy5a9IO1D0EbbBDqpWeKLVRe" alt="https://calssa.org/" style="margin-right: 0px;"></a></font></div></span></div></div></div></div></div></div></div>