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--></style></head><body lang="EN-US" link="blue" vlink="purple"><div class="WordSection1"><p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:#1f497d">Chris:</span></p><p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:#1f497d"> </span></p><p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:#1f497d">If you do provide transformers I think they are called step-up/step down. Buck/boost transformers I believe are to make adjustments to voltages.</span></p><p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:#1f497d"> </span></p><p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:#1f497d">I have learned that you need to account for the current flow and direction. For one-way flow, the upstream transformer has a slightly different turns ratio than the downstream transformer to account for voltage drop. With two-way current flow, you might want to consult an engineer (application or electrical) to determine the best, most efficient transformer pair. You can incur a lot of losses with transformers so design is critical.</span></p><p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:#1f497d"> </span></p><p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:#1f497d">One other complication can occur: In-rush currents can cause nuisance beaker tripping. You may need to buy a breaker with higher AIC rating to compensate for this.</span></p><p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:#1f497d"> </span></p><p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:#1f497d">Also, I bought a transformer from a reputable manufacturer that had mis-labeled terminals. The smell was hard to forget. I suggest you ohm-out any transformer to identify terminals on the same and different windings.</span></p><p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:#1f497d"> </span></p><p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:#1f497d">In general, this kind of project can have some unforeseen complications. I am not that experienced, but the experience I do have has come at some cost. I hope to help you and fellow wrenches avoid some of that pain.</span></p><p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:#1f497d"> </span></p><p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:#1f497d">Sincerely,</span></p><p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:#1f497d"> </span></p><p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:#1f497d">William Miller</span></p><p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:#1f497d"> </span></p><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black"><img width="64" height="28" style="width:.6666in;height:.2916in" id="Picture_x0020_1" src="cid:image002.jpg@01D1F7AD.43721D50" alt="Gradient Cap_mini"><br>Lic 773985<br><a href="http://www.millersolar.com/"><span style="color:blue">millersolar.com</span></a><br>805-438-5600</span></p><p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:#1f497d"> </span></p><p class="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 [mailto:<a href="mailto:re-wrenches-bounces@lists.re-wrenches.org">re-wrenches-bounces@lists.re-wrenches.org</a>] <b>On Behalf Of </b>Chris Mason<br><b>Sent:</b> Tuesday, August 16, 2016 10:39 AM<br><b>To:</b> RE-wrenches <<a href="mailto:re-wrenches@lists.re-wrenches.org">re-wrenches@lists.re-wrenches.org</a>><br><b>Subject:</b> Re: [RE-wrenches] Buck-Boost transformer to mitigate high voltage drop?</span></p><p class="MsoNormal"> </p><div><p class="MsoNormal">How much of the power produced will be self-consumed, how much will be exported?</p></div><div><p class="MsoNormal"> </p><div><p class="MsoNormal">On Tue, Aug 16, 2016 at 12:16 PM, Howard Arey <<a href="mailto:scot.arey@solarcentex.com" target="_blank">scot.arey@solarcentex.com</a>> wrote:</p><blockquote style="border:none;border-left:solid #cccccc 1.0pt;padding:0in 0in 0in 6.0pt;margin-left:4.8pt;margin-right:0in"><div><div><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Good day,</p><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> </p><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">I have a potential client that has an existing 1,000 foot run from the meter and transformer at the street to the home. This is 4/0 Al and quick calcs show the voltage drop at over 12%. He acknowledges that the wire is undersized to keep voltage at/about 240 volts (I have not measured directly at the street / transformer yet).</p><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> </p><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">I know the wire has the necessary ampacity to carry his current service needs and to carry amps from the to-be-suggested solar system.</p><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> </p><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">My concern is that the voltage drop will change the 240 volts at the street/transformer/meter to 211ish (or will I see a higher 268’sh voltage at the far house end?) at the house. The inverter will try to synch to this voltage but of course this is outside of typical inverter parameters.</p><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> </p><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">So, instead of re-running much large wire, does anybody have experience and comments about potentially using a buck-boots transformer at the home to get us back to 240 volts? This would need to be service entrance sized.</p><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> </p><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><b>Howard “Scot” Arey</b></p><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Owner, Solar CenTex</p><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><a href="tel:254-300-1228" target="_blank">254-300-1228</a></p><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><a href="mailto:scot.arey@solarcentex.com" target="_blank">scot.arey@solarcentex.com</a></p><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> </p></div></div><p class="MsoNormal" style="margin-bottom:12.0pt"><br>_______________________________________________<br>List sponsored by Redwood Alliance<br><br>List Address: <a href="mailto:RE-wrenches@lists.re-wrenches.org">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" target="_blank">http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org</a><br><br>List-Archive: <a href="http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html" target="_blank">http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html</a><br><br>List rules & etiquette:<br><a href="http://www.re-wrenches.org/etiquette.htm" target="_blank">www.re-wrenches.org/etiquette.htm</a><br><br>Check out or update participant bios:<br><a href="http://www.members.re-wrenches.org" target="_blank">www.members.re-wrenches.org</a><br><br></p></blockquote></div><p class="MsoNormal"><br><br clear="all"></p><div><p class="MsoNormal"> </p></div><p class="MsoNormal">-- </p><div><div><p class="MsoNormal">Chris Mason</p><div><div><p class="MsoNormal"><span style="font-size:10.0pt;color:#888888">NABCEP Certified Solar PV Installer™</span><span style="color:#888888"></span></p></div><div><p class="MsoNormal"><span style="color:#222222">Solar Design Engineer</span><span style="color:#888888"></span></p></div><div><p class="MsoNormal"><span style="font-size:10.0pt;color:#888888">Generac Generators Industrial technician</span><span style="color:#888888"></span></p></div></div><div><p class="MsoNormal"><span style="color:#888888"> </span></p></div><div><p class="MsoNormal"><a href="http://www.cometenergysystems.com" target="_blank">www.cometsolar.com</a></p></div><div><p class="MsoNormal">264.235.5670</p></div><div><p class="MsoNormal">869.662.5670</p></div><div><p class="MsoNormal">Skype: netconcepts</p></div></div></div></div></div></body></html>