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    <div class="moz-cite-prefix">Mac,<br>
      To the best of my knowledge, yes. I believe the most common 4.01
      firmware will stack with any firmware above that number. 4.10 and
      above were designed to work with the GTI for grid-tied use after
      the year 2000, but should not affect stacking otherwise. I have
      never tried mixing 4.01 with the earliest Rev 1 (first couple of
      years) and Rev 2 (very short-lived transitional firmware). Can't
      remember if there was a Rev 3; not sure if such a thing existed in
      the field. <br>
      <br>
      As long as you have the stacking cable, it's routine. Limitations
      include the 32W idle tare; if one inverter overloads, both shut
      off; there's no master and slave, either will fill that role; set
      absorption times 0:10 off to avoid the two fighting each other in
      certain charging situations.<br>
      <br>
      Note that any SW can have later chips installed; it's a set of
      five. We did this several times years ago, to add EQ capability
      and 4.01 menu familiarity to some of the earliest units from the
      mid-90s. Of course, finding a chipset these days could be
      problematic.<br>
      Allan<br>
      <br>
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        <div class="Section1">
          <p class="MsoNormal"><b>Allan <span class="SpellE">Sindelar</span></b><br>
            <span style="font-size:10.0pt"><a
                href="mailto:Allan@positiveenergysolar.com"><span
                  style="color:#000099">Allan@positiveenergysolar.com</span></a></span><br>
            <span style="font-size:10.0pt">NABCEP Certified PV
              Installation Professional <br>
              NABCEP Certified Technical Sales Professional<br>
              New Mexico EE98J Journeyman Electrician<br>
              Founder and Chief Technology Officer<br>
              <b>Positive Energy, Inc.</b>, a Certified B <span
                class="SpellE">Corporation<sup><span
                    style="font-size:7.5pt">TM</span></sup></span><br>
              3209 Richards Lane<br>
              Santa Fe, New Mexico 87507<br>
              <b>505 424-1112 office 780-2738 cell</b><br>
              <a href="http://www.positiveenergysolar.com/"
                target="_blank">www.positiveenergysolar.com</a><br>
            </span></p>
          <p class="MsoNormal"><span style="font-size:10.0pt"><br>
              <br>
            </span></p>
        </div>
      </div>
      On 6/7/2013 9:06 PM, Mac Lewis wrote:<br>
    </div>
    <blockquote
cite="mid:CAOABG4-7D25-swJP3FGSO4PKRucODTG6C7Z3RFmK1TWJ49m7og@mail.gmail.com"
      type="cite">
      <div dir="ltr">Hello wrenches,
        <div><br>
        </div>
        <div>I am contemplating  stacking a Trace SW 4024 to an existing
          Trace SW 4024 system and converting to 120/240.  I have done
          this before and it seemed straightforward.  Are there any
          challenges that wrenches have had when attempting this?  Also,
          is there any compatibility issues within any SW 4024.  In
          other words, can I stack any 4024 made, with any other 4024?</div>
        <div><br>
        </div>
        <div><br>
        </div>
        <div>Thanks in advance<br clear="all">
          <div><br>
          </div>
          -- <br>
          <div><br>
          </div>
          <div><font face="'times new roman', serif" color="#305A78"><br>
            </font></div>
          <div><br>
          </div>
          Mac Lewis<br>
          <br>
          <span style="font-family:'Times New
            Roman';font-size:medium;color:rgb(255,153,0)"><b><font
                face="Arial, Helvetica, sans-serif" size="3">
                <p align="left"><font face="Verdana, Arial, Helvetica,
                    sans-serif" color="#000000"><span
                      style="font-size:small"><span
                        style="font-family:arial;font-weight:normal;color:rgb(48,90,120)"><font
                          face="'times new roman', serif">"Yo solo sé
                          que no sé nada." </font><span
                          style="font-weight:700;color:rgb(104,104,104)"><font
                            face="'times new roman', serif">-Sócrates</font></span></span></span></font></p>
              </font></b></span>
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      <br>
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      <br>
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