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<p class=MsoNormal><span style='color:#1F497D'>Take it from someone in the
trenches out here in the Aloha State....yes, we have to jump through these
hoops. The utilities here—HECO, MECO, HELCO and KIUC—vary as
far as what they require regarding verification and documentation. It’s
been my experience that HECO and MECO are more lax whereas HELCO (even though
these three are all owned by the same parent company...Hawaiian Electric
Industries) is more stringent.<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>The required frequency set
points and trip delays can be found in the December 2011 HECO Rule 14 paragraph
h. I can provide the document to those who are interested.<o:p></o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='color:#1F497D'>marco</span><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'><o:p></o:p></span></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Folks,<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>I was told that because the HI grid has poor frequency
control, grid-tied inverters have to have their low frequency limit set to 57
Hz so they can ride out the worst low frequency events.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>I find it hard to believe that this has been done for every
single inverter installed in HI.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>But, what do I know.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Can anyone shed some light on this?<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Thanks,<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Mark Frye<o:p></o:p></p>
<p class=MsoNormal>Berkeley Solar Electric Systems<o:p></o:p></p>
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