<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div dir="ltr"></div><div dir="ltr">Assuming it’s wired correctly which it sounds like it is . A few thoughts. </div><div dir="ltr">Inverter dc calibration, inverter charge voltage setpoints, and as someone said how full are the batteries? </div><div dir="ltr">I can’t think of anything else.</div><div dir="ltr"><br></div><div dir="ltr">But if all else fails, and regardless of battery % it won’t act correctly then I’d do a factory reset annd see if that fixes it. If not then update rhw firmware on mate and all inverters. Of course you can try just the mate update first which usually has been the most common fix. </div><div dir="ltr"><br></div><div dir="ltr">I have seen odd behaviors that could not be explained that firmware reinstalled or updated fixed. I used to travel with all the firmware updates on SD cards in my truck. </div><div dir="ltr"><br></div><div dir="ltr">Out of curiosity are these the new Outback or the old Outback equipment?</div><div dir="ltr"><br></div><div dir="ltr">Good luck </div><div dir="ltr"><br></div><div dir="ltr"><br></div><div dir="ltr"><br><blockquote type="cite">On Mar 16, 2026, at 9:23 AM, Jason Szumlanski via RE-wrenches <re-wrenches@lists.re-wrenches.org> wrote:<br><br></blockquote></div><blockquote type="cite"><div dir="ltr"><div dir="ltr" gmail_original="1"><div><div class="gmail_default" style="font-family: arial, helvetica, sans-serif;">The manual says to set a subphase master when doing split phase with serial/parallel stacking, but I guess it's worth a try!</div><br clear="all"></div><div><div dir="ltr" class="gmail_signature"><div dir="ltr"><br>Jason Szumlanski<div><span style="color: rgb(51, 51, 51); font-family: Roboto, RobotoDraft, Helvetica, Arial, sans-serif; font-size: 13px;">Principal Solar Designer | Florida Solar Design Group</span><br style="color: rgb(51, 51, 51); font-family: Roboto, RobotoDraft, Helvetica, Arial, sans-serif; font-size: 13px;"><span style="color: rgb(51, 51, 51); font-family: Roboto, RobotoDraft, Helvetica, Arial, sans-serif; font-size: 13px;">NABCEP Certified Solar Professional (PVIP)</span><br style="color: rgb(51, 51, 51); font-family: Roboto, RobotoDraft, Helvetica, Arial, sans-serif; font-size: 13px;"><span style="color: rgb(51, 51, 51); font-family: Roboto, RobotoDraft, Helvetica, Arial, sans-serif; font-size: 13px;">Florida State Certified Solar Contractor CVC56956</span></div><div><font color="#333333" face="Roboto, RobotoDraft, Helvetica, Arial, sans-serif">Florida Certified Electrical Contractor EC13013208</font></div></div></div></div><br></div><br><div class="gmail_quote gmail_quote_container"><div dir="ltr" class="gmail_attr">On Mon, Mar 16, 2026 at 11:10 AM Kirk Herander <kirkh@vermont.solar> 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 dir="ltr"><div style="font-family: verdana, sans-serif;">Will the inverter support just 1 master and 3 slave configuration? This might enable all the slaves to charge.</div></div><br><img width="0" height="0" class="mailtrack-img" alt="" style="display:flex" src="https://mailtrack.io/trace/mail/w/cmUtd3JlbmNoZXNAbGlzdHMucmUtd3JlbmNoZXMub3Jn/4cb69beb54055f179a70ec989ace13f1c83cb8f5.png?u=1613865" data-unique-identifier=""><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, Mar 16, 2026 at 11:01 AM Jason Szumlanski via RE-wrenches <<a href="mailto:re-wrenches@lists.re-wrenches.org" target="_blank">re-wrenches@lists.re-<wbr>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 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 style="font-family: arial, helvetica, sans-serif;"><br></div><div 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">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>
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<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">re-wrenches@lists.re-<wbr>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>
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</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"><p></p><p class="MsoNormal" style="color: rgb(0, 0, 0); font-family: Arial; font-size: 16px; margin: 0in 0in 0.0001pt;"><a name="m_2737089801099791222_m_2828983547981170789_m_6137456120595690870_SignatureSanitizer__MailAutoSig" style="font-size: 10pt;"><b><img width="96" height="72" src="https://ci3.googleusercontent.com/mail-sig/AIorK4zIGox3hmaGW8StlnANQvRdXBrTEgpee6ZmV_8h-pfWcEl7lwlqfhSqd2PgPh89cgzwpzfUzuuIGxKE" data-unique-identifier=""><br></b></a></p><p class="MsoNormal" style="color: rgb(0, 0, 0); font-family: Arial; font-size: 16px; margin: 0in 0in 0.0001pt;"><a name="m_2737089801099791222_m_2828983547981170789_m_6137456120595690870_SignatureSanitizer__MailAutoSig" style="font-size: 10pt;"><b>Kirk Herander / </b></a><b style="font-size: 10pt;"><a href="mailto:kirkh@vermont.solar" title="Send an email to kirkh@vermont.solar; Send an email to kirkh@vermont.solar" style="color: blue;" target="_blank">kirkh@vermont.solar</a></b></p><p class="MsoNormal" style="color: rgb(0, 0, 0); font-family: Arial; font-size: 16px; margin: 0in 0in 0.0001pt;"><span style="font-size: 10pt;"><b>Owner|Principal, VT Solar, LLC</b></span></p><p class="MsoNormal" style="color: rgb(0, 0, 0); font-family: Arial; font-size: 16px; margin: 0in 0in 0.0001pt;"><span style="font-size: 10pt;"><b><i>Celebrating our 35<sup>th</sup> Anniversary 1991-2026!!</i></b></span></p><p class="MsoNormal" style="color: rgb(0, 0, 0); font-family: Arial; font-size: 16px; margin: 0in 0in 0.0001pt;"><span style="font-size: 10pt;">dba Vermont Solar Engineering</span><br></p><p class="MsoNormal" style="color: rgb(0, 0, 0); font-family: Arial; font-size: 16px; margin: 0in 0in 0.0001pt;"><span style="font-size: 10pt;">802.559.1225</span></p></div></div>
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