<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div dir="ltr"></div><div dir="ltr">Hi Ray,</div><div dir="ltr"><br></div><div dir="ltr">I am going to disagree with you. </div><div dir="ltr">The transformer in OB stacking mode balances the inverter outputs and allows out of balance phase power. Depending on how you set the power save mode it\u2019ll use master then trigger slave to turn on about 1000 watts. But you could have 2000 watts on leg 1 with each inverter doing 1000 watts. </div><div dir="ltr"><br></div><div dir="ltr">As to the mode, you need OB stacking, not classic stacking for the use of the balancing transformer. </div><div dir="ltr"><br></div><div dir="ltr">Jay</div><div dir="ltr"><br></div><div dir="ltr"><br>On Jul 24, 2019, at 9:43 PM, Ray <<a href="mailto:ray@solarray.com">ray@solarray.com</a>> wrote:<br><br></div><blockquote type="cite"><div dir="ltr">
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<p>The transformer is just to balance the legs, and isn't necessary
to run the heat pump with 2 inverters. On the programming, port 1
should be <i>stack </i><i>1-2 ph Master</i>, and then set port 2
to <i>Classic slave.</i> <br>
</p>
<p>BTW, we as an industry should move far away from this archaic
and offensive labeling. Master? Slave? My daughter heard me
mention that the other day and was mortified, as all of us should
be too. Gentlefolks, it's time for some 21st Century solar
Vocabulary.<br>
</p>
<pre class="moz-signature" cols="72">Ray Walters
Remote Solar
303 505-8760</pre>
<div class="moz-cite-prefix">On 7/24/19 6:08 PM, David Palumbo
wrote:<br>
</div>
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<p class="MsoNormal">I apologize for my ignorance on this issue,
but in all my years I have never had to power a 230V load with
an OutBack system before. </p>
<p class="MsoNormal">A couple of quick questions. It is a 8 year
old OutBack system with two FX2524T\u2019s presently powering two
120Vac legs with no 240Vac output.<o:p></o:p></p>
<ul style="margin-top:0in" type="disc">
<li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo1">Homeowner is
adding a Fujitsu mini split heat pump for air conditioning
the home (summers are getting hot enough for AC even in
northern Vermont). <o:p></o:p></li>
<li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo1">It uses 7.9
Amps @ 230Vac <o:p></o:p></li>
<li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo1">I have a OB
PSX-240 Autoformer manufactured in 2008 in my inventory
here. Should I use it for this application?<o:p></o:p></li>
<li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo1">Do I wire it
up just like in this schematic?<o:p></o:p></li>
<li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo1">If so, what
do I change in the programing on the Mate? Presently it is
ADV/FX/STACK stack 1-2ph Master. Do I simply change it to
ADV/FX/STACK stack Classic Slave?<o:p></o:p></li>
</ul>
<p class="MsoNormal">Thanks,<o:p></o:p></p>
<p class="MsoNormal">Dave Palumbo, Independent Power, Hyde Park,
VT<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><img style="width:7.3916in;height:5.5416in" id="Picture_x0020_1" src="cid:image003.jpg@01D5425B.8E870C50" alt="cid:image003.jpg@01D54135.D30AA520" moz-do-not-send="true" width="710" height="532"></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Sent from <a href="https://go.microsoft.com/fwlink/?LinkId=550986" moz-do-not-send="true">Mail</a> for Windows 10</p>
<p class="MsoNormal"><o:p> </o:p></p>
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