<div dir="ltr">William,<div>If your voltage at the pump is 205 voltage at no load, it is not a cable issue, your source of power is at too low a voltage. Voltage drop is proportional to current, no current, no voltage drop. </div>
<div>Most 208V system are run at about 215v, to allow for some drop and to facilitate 240v equipment. If there is a way to tweak your inverter output voltage to 220v, you will save yourself some problems.</div><div>The island of St. Maarten runs at 220v 3 phase (127V single phase) and everyone used US made equipment, so it will not cause problems.</div>
<div>If your pump was designed for single phase 240V, you can install a buck/boost transformer, it is done all the time for exactly this reason. The phase angle is not relevant when you are talking about two phases.</div>
</div><div class="gmail_extra"><br><br><div class="gmail_quote">On Thu, Jul 3, 2014 at 2:33 AM, William Miller <span dir="ltr"><<a href="mailto:william@millersolar.com" target="_blank">william@millersolar.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div lang="EN-US" link="blue" vlink="purple"><div><p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Arial","sans-serif"">Friends:<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Arial","sans-serif""><u></u> <u></u></span></p><p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Arial","sans-serif"">About two months ago I inquired of this forum about complications that might result from running a residence on a 208 volt 3 phase system. One respondent indicated that motors might be affected. Sure enough the owner is having problems with the well pump. It is tripping circuit breakers.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Arial","sans-serif""><u></u> <u></u></span></p><p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Arial","sans-serif"">I conferred with a pump specialist. The information I was given is that the standard single phase pump is rated at 230 VAC and can operate at +/- 10%. This means the voltage must be at least 207 VAC.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Arial","sans-serif""><u></u> <u></u></span></p><p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Arial","sans-serif"">The measured no load voltage at the pump is 205 and loaded is 200. The leads to the pump are 10 AWG and this is too small for the well pump (guessing it is 2 to 3 horsepower). Even after I upgrade the wire the best I can do is 204-ish.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Arial","sans-serif""><u></u> <u></u></span></p><p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Arial","sans-serif"">Can I install a transformer to increase the voltage? Would the phase angle at the secondary become 180°?<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Arial","sans-serif""><u></u> <u></u></span></p><p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Arial","sans-serif"">Thanks in advance.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Arial","sans-serif""><u></u> <u></u></span></p><p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Arial","sans-serif"">William<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Arial","sans-serif""><u></u> <u></u></span></p><p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Arial","sans-serif""><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:black"><img width="64" height="28" src="cid:image003.jpg@01CF964C.945C94D0" alt="Gradient Cap_mini"><br>Lic 773985<br>
<a href="http://www.millersolar.com/" target="_blank">millersolar.com</a><br><a href="tel:805-438-5600" value="+18054385600" target="_blank">805-438-5600</a><u></u><u></u></span></p><p class="MsoNormal"><u></u> <u></u></p>
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<br></blockquote></div><br><br clear="all"><div><br></div>-- <br><div dir="ltr">Chris Mason<div><div style="color:rgb(136,136,136)"><span style="font-size:13px">NABCEP Certified Solar PV Installer™</span></div><div style="color:rgb(136,136,136)">
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