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<DIV dir=ltr align=left><SPAN class=093484017-16112011><FONT color=#0000ff
size=2 face=Arial>Rebekah,</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=093484017-16112011><FONT color=#0000ff
size=2 face=Arial></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=093484017-16112011><FONT color=#0000ff
size=2 face=Arial>If you knew only the power and voltage, then you would use the
root of 3 to determine the amps. But since you know the amps, you don't need to
use the root.</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=093484017-16112011><FONT color=#0000ff
size=2 face=Arial></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=093484017-16112011><FONT color=#0000ff
size=2 face=Arial>The second equation would be the correct
one.</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=093484017-16112011></SPAN> <BR><SPAN
lang=en-us><FONT size=2 face=Arial>Mark Frye</FONT></SPAN> <BR><SPAN
lang=en-us><FONT size=2 face=Arial>Berkeley Solar Electric Systems</FONT></SPAN>
<BR><SPAN lang=en-us><FONT size=2 face=Arial>303 Redbud Way</FONT></SPAN>
<BR><SPAN lang=en-us><FONT size=2 face=Arial>Nevada City, CA
95959</FONT></SPAN> <BR><SPAN lang=en-us><FONT size=2 face=Arial>(530)
401-8024</FONT></SPAN> <BR><SPAN lang=en-us></SPAN><A
href="http://www.berkeleysolar.com/"><SPAN lang=en-us><U><FONT color=#0000ff
size=2 face=Arial>www.berkeleysolar.com</FONT></U></SPAN></A><SPAN
lang=en-us><FONT size=2 face=Arial> </FONT></SPAN> </DIV>
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<HR tabIndex=-1>
<FONT size=2 face=Tahoma><B>From:</B> re-wrenches-bounces@lists.re-wrenches.org
[mailto:re-wrenches-bounces@lists.re-wrenches.org] <B>On Behalf Of </B>Rebekah
Hren<BR><B>Sent:</B> Wednesday, November 16, 2011 9:36 AM<BR><B>To:</B>
RE-wrenches@lists.re-wrenches.org<BR><B>Subject:</B> [RE-wrenches] Sizing 3
phase OCPD - main<BR></FONT><BR></DIV>
<DIV></DIV>
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<DIV class=MsoNormal><SPAN style="FONT-FAMILY: 'Times New Roman'">Hi
wrenches, </SPAN></DIV>
<DIV class=MsoNormal><SPAN
style="FONT-FAMILY: 'Times New Roman'"><BR></SPAN></DIV>
<DIV class=MsoNormal><SPAN style="FONT-FAMILY: 'Times New Roman'">I have a
question about sizing the main OCP breaker for a panel combining the output of
several true three-phase output inverters. To be precise - 10 of the
Refusol 20kW, which connect to 480V/277 Y with a max output of 24.1 amps,
each inverter has a 3 pole breaker, line a, b, c and a neutral, which doesn’t
apparently carry any current. <O:P></O:P></SPAN></DIV>
<DIV class=MsoNormal><SPAN
style="FONT-FAMILY: 'Times New Roman'"><O:P></O:P></SPAN></DIV>
<DIV class=MsoNormal><SPAN style="FONT-FAMILY: 'Times New Roman'">Recommended
interconnection breaker is 35 Amps. Ok fine, but what should the main breaker
and main panel busbar rating be? <O:P></O:P></SPAN></DIV>
<DIV class=MsoNormal><SPAN
style="FONT-FAMILY: 'Times New Roman'"><O:P></O:P></SPAN></DIV>
<DIV class=MsoNormal><SPAN style="FONT-FAMILY: 'Times New Roman'">What I’m not
sure about is if this is the right equation for the main breaker in a panel
combining all ten inverter outputs: <O:P></O:P></SPAN></DIV>
<DIV class=MsoNormal><SPAN style="FONT-FAMILY: 'Times New Roman'">10 x
24.1A x –3 x 1.25 = 521.8 A<O:P></O:P></SPAN></DIV>
<DIV class=MsoNormal><SPAN
style="FONT-FAMILY: 'Times New Roman'"><O:P></O:P></SPAN></DIV>
<DIV class=MsoNormal><SPAN style="FONT-FAMILY: 'Times New Roman'">or is this the
right equation:<O:P></O:P></SPAN></DIV>
<DIV class=MsoNormal><SPAN style="FONT-FAMILY: 'Times New Roman'">10 x 24.1A x
1.25 = 301.25 A<O:P></O:P></SPAN></DIV>
<DIV class=MsoNormal><SPAN
style="FONT-FAMILY: 'Times New Roman'"><O:P></O:P></SPAN></DIV>
<DIV class=MsoNormal><SPAN style="FONT-FAMILY: 'Times New Roman'">The busbar
rating should be easy, once I get the main disco OCPD figured out.
<O:P></O:P></SPAN></DIV>
<DIV class=MsoNormal><SPAN style="FONT-FAMILY: 'Times New Roman'">Main OCPD +
(10 x 35) ˜ 120% busbar
rating<O:P></O:P></SPAN></DIV><!--EndFragment--></SPAN></DIV>
<DIV><BR></DIV>
<DIV><BR></DIV>
<DIV>Thanks for the help!<BR>Rebekah Hren</DIV></DIV></BODY></HTML>