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<title>Home Brew Frequency Switch</title>
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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Does anybody happen to have a temp sensor
for a Xantrex XW inverter? This is the type that bolts onto the negative
battery terminal. I am not sure but I think the Magnum temp sensor may
work as well. We have been trying for weeks to track one down for a
customer from our distributors and Schneider—everyone says they have it
but they don’t. . .<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>If so, shoot me a message off list and I
will take it. Used is fine. . .<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<div>
<p class=MsoAutoSig><font size=2 color=navy face="Comic Sans MS"><span
style='font-size:10.0pt;font-family:"Comic Sans MS";color:navy'>Best regards,<o:p></o:p></span></font></p>
<p class=MsoAutoSig><font size=2 color=navy face="Comic Sans MS"><span
style='font-size:10.0pt;font-family:"Comic Sans MS";color:navy'><o:p> </o:p></span></font></p>
<p class=MsoAutoSig><font size=2 color=navy face="Comic Sans MS"><span
style='font-size:10.0pt;font-family:"Comic Sans MS";color:navy'>Mark </span></font><font
size=2 color=navy face="Comic Sans MS"><span style='font-size:10.0pt;
font-family:"Comic Sans MS";color:navy'>Dickson,</span></font><font color=navy><span
style='color:navy'><o:p></o:p></span></font></p>
<p class=MsoAutoSig><font size=2 color=navy face=ArialMT><span
style='font-size:10.0pt;font-family:ArialMT;color:navy'>NABCEP Certified Solar
PV Installer ™<o:p></o:p></span></font></p>
<p class=MsoAutoSig><font size=2 color=navy face="Comic Sans MS"><span
style='font-size:10.0pt;font-family:"Comic Sans MS";color:navy'>Oasis Montana
Inc.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 color=navy face="Times New Roman"><span
style='font-size:12.0pt;color:navy'> <o:p></o:p></span></font></p>
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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
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<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>
re-wrenches-bounces@lists.re-wrenches.org [mailto:re-wrenches-bounces@lists.re-wrenches.org]
<b><span style='font-weight:bold'>On Behalf Of </span></b>Maverick Brown
[Maverick Solar]<br>
<b><span style='font-weight:bold'>Sent:</span></b> Tuesday, March 01, 2011 6:58
PM<br>
<b><span style='font-weight:bold'>To:</span></b> '<st1:PersonName w:st="on">RE-wrenches</st1:PersonName>'<br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [<st1:PersonName
w:st="on">RE-wrenches</st1:PersonName>] Home Brew Frequency Switch</span></font><o:p></o:p></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=blue face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:blue'>"I have considered using a drop out
contactor to isolate the inverters from the generator following a loss of line
voltage."</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=blue face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:blue'>I suggest that method above as the best.
Generators can change frequencies under load and other conditions, etc. so
there would not be such a precise control.</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=blue face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:blue'>Line voltage coil relays are also cheaper
and easier to get as compared to frequency controls.</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=blue face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:blue'>The voltage drop out contactor might
be easier to implement using the KISS method.</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=blue face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:blue'>Good Luck!</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=blue face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:blue'>Maverick</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
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<p class=MsoNormal style='margin-bottom:12.0pt'><b><font size=2 face=Tahoma><span
style='font-size:10.0pt;font-family:Tahoma;font-weight:bold'>From:</span></font></b><font
size=2 face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>
re-wrenches-bounces@lists.re-wrenches.org [mailto:re-wrenches-bounces@lists.re-wrenches.org]
<b><span style='font-weight:bold'>On Behalf Of </span></b>Mark Frye<br>
<b><span style='font-weight:bold'>Sent:</span></b> Tuesday, March 01, 2011
11:20 AM<br>
<b><span style='font-weight:bold'>To:</span></b> '<st1:PersonName w:st="on">RE-wrenches</st1:PersonName>'<br>
<b><span style='font-weight:bold'>Subject:</span></b> [<st1:PersonName w:st="on">RE-wrenches</st1:PersonName>]
Home Brew Frequency Switch</span></font><o:p></o:p></p>
<p><font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'><!-- Converted from text/rtf format -->Folks,</span></font>
<o:p></o:p></p>
<p><font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>I
am back on the project where I want to install grid tied inverters (Enphase) on
a feeder located downstream of a generator and ATS.</span></font><o:p></o:p></p>
<p><font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>I
have considered using a drop out contactor to isolate the inverters from the
generator following a loss of line voltage.</span></font><o:p></o:p></p>
<p><font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>As
an alternative, how well might it work to reset the generator frequency so that
it is outside the inverter range? In this way the inverter would always see the
generator as "bad" energy and therefore would never connect to the
generator, only the utility.</span></font><o:p></o:p></p>
<p><font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>The
nominal frequency range for the inverter is 59.3 to 60.5.</span></font> <o:p></o:p></p>
<p><font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>What
is the effect on the loads in the household if the generator frequency is
adjusted to say 58 or 62 hertz? Would the higher or lower number be better?
Would this fry everything in the house? I can't see that making a relatively
small change like this would effect the overall impedance such that a problem
with current capacities would be a problem. It seems like the frequency would
be more of a problem for some devices.</span></font><o:p></o:p></p>
<p><font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>Anyone
have experience with deliberately adjusting generator frequency away from 60
hertz as described above?</span></font> <br>
<font face=Arial><span style='font-family:Arial'> </span></font> <br>
<font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>Mark
Frye</span></font> <br>
<font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>Berkeley
Solar Electric Systems</span></font> <br>
<st1:address w:st="on"><st1:Street w:st="on"><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>303 Redbud Way</span></font></st1:Street>
<br>
<st1:City w:st="on"><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Nevada City</span></font></st1:City><font size=2
face=Arial><span style='font-size:10.0pt;font-family:Arial'>, <st1:State
w:st="on">CA</st1:State> <st1:PostalCode w:st="on">95959</st1:PostalCode></span></font></st1:address>
<br>
<font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>(530)
401-8024</span></font> <br>
<a href="http://www.berkeleysolar.com"><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>www.berkeleysolar.com</span></font></a><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'> </span></font>
<o:p></o:p></p>
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