<div dir="auto"><div>The slaves will naturally back off first. My first thought would be to check when the batteries are low enough to accept a full bulk charge.</div><div dir="auto"><br></div><div dir="auto">Reading further through the thread it seem like the port assignment is the culprit...</div><div dir="auto"><br></div><div dir="auto">Port 1 should be L1 master, port 2- L1 slave, port 7 L2 sub phase master, port 8 L2 slave. </div><div><br></div><div data-smartmail="gmail_signature">Sunny Regards,</div><div data-smartmail="gmail_signature" dir="auto"><br></div><div data-smartmail="gmail_signature" dir="auto">Tyrone Houck</div><div data-smartmail="gmail_signature" dir="auto">Oregon Solarworks LLC</div><div data-smartmail="gmail_signature" dir="auto">CCB #204937 LRT #076</div><div data-smartmail="gmail_signature" dir="auto">541-787-1366<br> </div></div><br><div class="gmail_quote gmail_quote_container"><div dir="ltr" class="gmail_attr">On Mon, Mar 16, 2026, 7:58 AM 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:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div dir="ltr"><div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif">The FXR manual supports the way it was installed and configured. There is an L1 master and an L2 "subphase master." Each of the slaves is assigned to L1 or L2.</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">And BTW I do have the input mode set to Generator for all four inverters (although the slaves take the setting from their masters anyway).</div><br clear="all"></div><div><div dir="ltr" class="gmail_signature"><div dir="ltr"><br>Jason <br></div></div></div><br></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, Mar 16, 2026 at 10:49 AM Steve Higgins <<a href="mailto:steve@surrette.com" target="_blank" rel="noreferrer">steve@surrette.com</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="auto"><div><div>Hey Jason... I'll admit it's been awhile since I was with OB. But from what I remember you can only have one Master inverter. </div><div dir="auto"><br></div><div dir="auto">You can't have a master and slave on each leg.</div><div dir="auto"><br></div><div dir="auto">The port one inverter needs to be a 1 -2 phase master. </div><div dir="auto"><br></div><div dir="auto">The other three should be slave L1 or L2 depending on the phase that they are connected to. </div><div dir="auto"><br></div><div dir="auto">My bet is the charging isn't syncing due to the master/slave setup. </div><div dir="auto"><br></div><div dir="auto">Right now they aren't backfeeding due to the generator is syncing the phases. I like to call magic stacking. Eventually when the generator isn't running you could see enough drift from that 2nd 1-2 phase master that might cause a backfeed or overcurrent error. </div><div dir="auto"><br></div><div><br></div><div><table style="width:490px;border-width:1px;margin:0px auto 0px 0px;height:155.5px" border="1"><colgroup><col style="width:123px"><col style="width:366px"></colgroup>
<tbody>
<tr style="height:62px">
<td style="text-align:center;vertical-align:middle;border-style:hidden">
<div style="text-align:left"><img style="display:block;margin-left:auto;margin-right:auto" src="https://storage.googleapis.com/bucket-images-sig/RollsbySurrette.jpg" alt="" width="100"></div>
</td>
<td style="border-style:hidden" rowspan="2">
<div style="text-align:left"><span style="color:rgb(216,0,29);font-family:arial,helvetica,sans-serif;font-size:8pt"><strong>Steve Higgins</strong> <span style="color:rgb(0,0,0)"><strong>⋅</strong></span> <span style="color:rgb(0,0,0)"><strong>Technical Services Manager</strong></span></span></div>
<div style="text-align:left"><span style="font-family:arial,helvetica,sans-serif;font-size:7pt;color:rgb(216,0,29)"><strong>t</strong> <span style="color:rgb(0,0,0)">+1.902.597.4020</span> <strong>m</strong> <span style="color:rgb(0,0,0)">+1.206.790.5840</span></span></div>
<div style="text-align:left"><span style="font-family:arial,helvetica,sans-serif;font-size:7pt;color:rgb(216,0,29)"><strong>f</strong> <span style="color:rgb(0,0,0)">+1.902.597.8447</span> <strong>e</strong> <span style="color:rgb(0,0,0)"><a href="mailto:steve@surrette.com" target="_blank" rel="noreferrer">steve@surrette.com</a></span></span></div>
</td>
</tr>
<tr style="height:30.5px">
<td style="text-align:center;vertical-align:middle;border-style:hidden">
<div style="text-align:center"><span style="color:rgb(216,0,29);font-family:arial,helvetica,sans-serif;font-size:8pt"><strong><span style="font-family:arial,helvetica,sans-serif;font-size:7pt;color:rgb(216,0,29)"><span style="color:rgb(0,0,0)"><img src="http://cdn3.iconfinder.com/data/icons/free-social-icons/67/facebook_square_gray-24.png" alt="" width="24" height="24"><img src="https://cdn3.iconfinder.com/data/icons/free-social-icons/67/instagram_square-24.png" width="24" height="24"><img src="http://cdn3.iconfinder.com/data/icons/free-social-icons/67/youtube_square_gray-24.png" alt="" width="24" height="24"><img src="http://cdn3.iconfinder.com/data/icons/free-social-icons/67/linkedin_square_gray-24.png" alt="" width="24" height="24"></span></span></strong></span></div>
</td>
</tr>
<tr style="height:63px">
<td style="border-style:hidden" colspan="2">
<div><hr></div>
<div style="text-align:justify;line-height:0.75"><span style="font-family:arial;font-size:6pt">CONFIDENTIALITY: The information transmitted herein is intended only for the addressee and may contain confidential, proprietary and/or privileged material. Any unauthorized review, distribution or other use of or the taking of any action in reliance upon this information is prohibited. If you receive this email in error, please contact the sender and delete or destroy this message and all copies.</span></div>
<div><hr></div>
</td>
</tr>
</tbody>
</table>
<p> </p></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, Mar 16, 2026, 7:40 AM Jason Szumlanski via RE-wrenches <<a href="mailto:re-wrenches@lists.re-wrenches.org" target="_blank" rel="noreferrer">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="auto"><div>I inherited am off-grid service client with four FXR3048A configured in 120/240 split phase with one master and one slave per leg. I believe I configured all of the AC input charging parameters correctly, requesting max charge rate from each inverter. However, when AC input is present (from a generator) the masters will bulk charge, but the slaves do not charge at all. The slaves do share the load, but show 0.0kW for charging.</div><div dir="auto"><br></div><div dir="auto">Any ideas?</div><div dir="auto"><br></div><div dir="auto">Jason Szumlanski </div><div dir="auto">Florida Solar Design Group </div><div><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><b></b></div></div></div></div></div></div></div></div>
_______________________________________________<br>
List sponsored by Redwood Alliance<br>
<br>
Pay optional member dues here: <a href="http://re-wrenches.org" rel="noreferrer noreferrer noreferrer" target="_blank">http://re-wrenches.org</a><br>
<br>
List Address: <a href="mailto:RE-wrenches@lists.re-wrenches.org" rel="noreferrer noreferrer" 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 noreferrer 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 noreferrer 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 noreferrer 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 noreferrer 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 noreferrer noreferrer" target="_blank">http://www.members.re-wrenches.org</a><br>
<br>
</blockquote></div></div></div>
</blockquote></div></div>
_______________________________________________<br>
List sponsored by Redwood Alliance<br>
<br>
Pay optional member dues here: <a href="http://re-wrenches.org" rel="noreferrer noreferrer" target="_blank">http://re-wrenches.org</a><br>
<br>
List Address: <a href="mailto:RE-wrenches@lists.re-wrenches.org" target="_blank" rel="noreferrer">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 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 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 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 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 noreferrer" target="_blank">http://www.members.re-wrenches.org</a><br>
<br>
</blockquote></div>