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<p class="MsoNormal">Hi Folks,<o:p></o:p></p>
<p class="MsoNormal">I’m wondering if anybody has ideas on what could be causing grid over/undervoltage errors on an install we did about a year ago that now has these issues. The site is a 24 kW DC ground mount array with (3) SMA SB7.0-1SP-US-40 inverters.
I’ve checked and done the following:<o:p></o:p></p>
<ol style="margin-top:0in" start="1" type="1">
<li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo1">Measured voltage min/max at inverter terminals and AC combiner. Min – 228VAC (with no inverter output) Max - 269 VAC (when inverter trying to connect)!<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo1">Had utility check service and transformer with load meter (with no PV running). No issues found and utility engineer stated he thinks it’s on our side.
<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo1">Checked all AC connections including neutral (seemed like neutral issue) from inverters back to supply-side tap (fused disco).
<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo1">Changed SMA upper voltage window in grid guard settings to 272V max and 264V reconnection. This helped for a while but now is faulting again.
<o:p></o:p></li></ol>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Have any of you ran into this issue and how did you solve it? Or what’s the next thing to check?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thanks in advance! <o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Be Well,<o:p></o:p></p>
<p class="MsoNormal">James Reismiller<o:p></o:p></p>
<p class="MsoNormal">He/Him/His<o:p></o:p></p>
<p class="MsoNormal"><span style="color:black">NABCEP Certified Solar PV Installer®<o:p></o:p></span></p>
<p class="MsoNormal">Abundant Solar<o:p></o:p></p>
<p class="MsoNormal">541-231-8072 xt. 3<o:p></o:p></p>
<p class="MsoNormal">CCB#175919<o:p></o:p></p>
<p class="MsoNormal"><img width="96" height="65" style="width:1.0in;height:.677in" id="Picture_x0020_1" src="cid:image002.png@01D74D5D.CA065970"><o:p></o:p></p>
<p class="MsoNormal"><a href="http://www.abundantsolar.com/abundantsolar/Home.html"><span style="color:#0563C1">www.abundantsolar.com</span></a><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="color:black">"Don't get me wrong: I love nuclear energy! It's just that I prefer fusion to fission. And it just so happens that there's an enormous fusion reactor safely banked a few million miles from us. It delivers more
than we could ever use in just about 8 minutes. And it's wireless!"<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:black">~William McDonough <o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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