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I would suggest that you confirm the service configuration first. You could have an open Delta, or less likely a high leg delta. Typically ahigh leg Delta will have four current carrying conductors supplying the MDP.</div>
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<img style="max-width: 462px;" alt="The Wild Leg" src="https://www.ecmag.com/images/default-source/articles/2025/february-2025/0225-code-commetns-high-leg-system-27-.tmb-art-detail.jpg?Culture=en&sfvrsn=f72ef8fa_1"></div>
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An open Delta also has a 180 degree relation ship, but is less efficient and you have to be cognizant about creating voltage imbalances.</div>
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In either case you have multiple options, but I recommend engaging a PE to help you do it correctly. There is more involved than simply getting the voltages correct.</div>
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Pieter Huebner</div>
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Project Manager</div>
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Off Grid Enterprises</div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> RE-wrenches <re-wrenches-bounces@lists.re-wrenches.org> on behalf of Sue Stankevitz via RE-wrenches <re-wrenches@lists.re-wrenches.org><br>
<b>Sent:</b> Wednesday, March 25, 2026 1:14 PM<br>
<b>To:</b> RE-wrenches <re-wrenches@lists.re-wrenches.org><br>
<b>Cc:</b> Sue Stankevitz <Sue@midnitesolar.com><br>
<b>Subject:</b> Re: [RE-wrenches] 120/240 Delta</font>
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<p class="x_MsoNormal"><span style="font-family:"Calibri",sans-serif">The Rosie7048RE will do 120/208 with just a setting adjustment.</span></p>
<p class="x_MsoNormal"><span style="font-family:"Calibri",sans-serif"> </span></p>
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<p class="x_MsoNormal"><span style="color:black">Sue Stankevitz</span><span style="color:black"><br>
<a href="https://www.midnitesolar.com/index.php">MidNite Solar, Inc.</a><br>
</span><span style="color:black">(360) 403-7207 (XT122)</span><span style="color:black"></span></p>
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<p class="x_MsoNormal"><b><span style="font-size:11.0pt; font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11.0pt; font-family:"Calibri",sans-serif"> RE-wrenches <re-wrenches-bounces@lists.re-wrenches.org>
<b>On Behalf Of </b>Michael Morningstar via RE-wrenches<br>
<b>Sent:</b> Wednesday, March 25, 2026 11:54 AM<br>
<b>To:</b> RE-wrenches <re-wrenches@lists.re-wrenches.org><br>
<b>Cc:</b> Michael Morningstar <mjmorningstar@gmail.com><br>
<b>Subject:</b> [RE-wrenches] 120/240 Delta</span></p>
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<p class="x_MsoNormal">Wrenches,</p>
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<p class="x_MsoNormal">I have a customer that has asked me to provide their restaurant with PV and battery back up. Easy-peasy or so I thought. It turns out that the service that supplies the restaurant is being fed by two phases from a 120/240V transformer.
The service entrance conductors are direct burial and run under a large paved parking lot, so there's no changing that arrangement. I'm at a loss as what I can do here. I don't believe that something like a Sol-Ark 18k is going to play nice with two legs 120
degrees out of phase? The 30K definitely needs all three phases so a 240 Delta/208 WYE isn't going to help? I don't even think there are micro-inverters or string inverters available to give them just straight grid-tied and no BB. Are there any solutions that
I'm unaware of?</p>
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<p class="x_MsoNormal">Michael</p>
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<p class="x_MsoNormal">?</p>
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<p style="margin:0in"><span style="font-size:13.5pt; font-family:"Helvetica",sans-serif">Michael Morningstar </span></p>
<p style="margin:0in"><span style="font-size:13.5pt; font-family:"Helvetica",sans-serif"> </span></p>
<p style="margin:0in"><span style="font-size:13.5pt; font-family:"Helvetica",sans-serif">Morningstar Electric Inc</span></p>
<p style="margin:0in"><span style="font-size:13.5pt; font-family:"Helvetica",sans-serif">PO Box 1494</span></p>
<p style="margin:0in"><span style="font-size:13.5pt; font-family:"Helvetica",sans-serif">Mount Shasta, CA 96067</span></p>
<p style="margin:0in"><span style="font-size:13.5pt; font-family:"Helvetica",sans-serif">530-921-0560</span></p>
<p style="margin:0in"><span style="font-size:13.5pt; font-family:"Helvetica",sans-serif">CSLB 1116835</span></p>
<p style="margin:0in"><span style="font-size:13.5pt; font-family:"Helvetica",sans-serif"><a href="mailto:mjmorningstar@gmail.com" target="_blank">mjmorningstar@gmail.com</a></span></p>
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