Solar Friends......as you have referenced Dave.... the code does allow for using the softer records relating to low temps......However.....as in the example presented in the SMA 2500U discussion going on right now one string brings you pretty close to 600V at 14 degrees......Should you get a lower temperature and exceed the 600V you could damage the inverter.....Its not that it will just not turn on...it will actually damage it and most inverter manufacturers will not honor a warranty if you exceed the voltage rating of their inverter......they also have very precise sensors to determine if the maximum voltage was exceeded....even by just a small amount.....<br>
Typically when referencing temperature data I think it prudent to use the record low but have a more flexible position on the record highs.....it is actually common for string sizing calculators to use the average high in string size calculation....the difference is that in the high temperature you dont risk damaging equipment.....simply it may not operate during the high temperature...<br>
My conservative me typically uses both record low and record high as my temperature parameters as this will both protect the system and allow the design to operate under any expected temps. That said....records were made to be broken!<br>
Cheers,<br><br>
-- <br>
Sunny Regards,<br>
Kirpal Khalsa<br>
NABCEP Certified Solar PV Installer<br>
Renewable Energy Systems<br>
<a href="http://www.oregonsolarworks.com/" target="_blank">www.oregonsolarworks.com</a><br>
541-218-0201 m<br>
541-592-3958 o <br> <br><br><div class="gmail_quote">On Wed, Nov 18, 2009 at 8:14 AM, Dave Click <span dir="ltr"><<a href="mailto:daveclick@fsec.ucf.edu">daveclick@fsec.ucf.edu</a>></span> wrote:<br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
Good catch Bob, there seems to be a page missing from that table... this report from Bill's site has the complete table (at the end of the file, again).<br>
<br>
<a href="http://www.brooksolar.com/files/Expedited_Explanation-5-6-09.pdf" target="_blank">http://www.brooksolar.com/files/Expedited_Explanation-5-6-09.pdf</a><div class="im"><br>
<br>
DKC<br>
<br>
-------- Original Message --------<br>
Subject: Re: [RE-wrenches] SWR2500U Inverter<br></div><div class="im">
From: robert ellison <<a href="mailto:reellison@gmail.com" target="_blank">reellison@gmail.com</a>><br>
To: RE-wrenches <<a href="mailto:re-wrenches@lists.re-wrenches.org" target="_blank">re-wrenches@lists.re-wrenches.org</a>><br></div><div class="im">
Date: 2009/11/18 11:01<br>
<br>
</div><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"><div class="im">
My eyes must be bad, i just looked at the entire list 3 times and New York state is not on it anywhere.<br>
I have see 48 below and just wanted to see what the averages ctually were.<br>
Bob<br>
<br></div><div class="im">
On Wed, Nov 18, 2009 at 7:30 AM, Dave Click <<a href="mailto:daveclick@fsec.ucf.edu" target="_blank">daveclick@fsec.ucf.edu</a> <mailto:<a href="mailto:daveclick@fsec.ucf.edu" target="_blank">daveclick@fsec.ucf.edu</a>>> wrote:<br>
<br>
Just a note here- rather than using the record lows, you can go back<br>
to the future and use the ASHRAE minimum expected temperatures as<br>
the 2011 NEC will allow explicitly. In the '08, it says to use the<br>
"lowest expected ambient temperature," for which the ASHRAE<br>
temperatures are more appropriate than record lows. These ASHRAE<br>
temps will be higher than the record lows and will add a little more<br>
cushion there at 600 VDC.<br>
<br>
So where to get these temperatures? Starting on page 47:<br>
<a href="http://www.solarabcs.org/permitting/Expermitprocess.pdf" target="_blank">http://www.solarabcs.org/permitting/Expermitprocess.pdf</a><br>
<br>
Also, in case you didn't know, <a href="http://www.pvselect.com" target="_blank">www.pvselect.com</a><br></div>
<<a href="http://www.pvselect.com/" target="_blank">http://www.pvselect.com/</a>> is another option for string sizing that<div class="im"><br>
features multiple inverters and a 1 degree temperature step rather<br>
than the 9 degree (F) temperature step on the SMA sizer. They have<br>
the Kyocera KD130 in their database, but not the KC130.<br>
<br>
DKC<br>
<br>
<br>
-------- Original Message --------<br>
Subject: Re: [RE-wrenches] SWR2500U Inverter<br>
From: Brian Teitelbaum <<a href="mailto:bteitelbaum@aeesolar.com" target="_blank">bteitelbaum@aeesolar.com</a><br></div><div class="im">
<mailto:<a href="mailto:bteitelbaum@aeesolar.com" target="_blank">bteitelbaum@aeesolar.com</a>>><br>
To: RE-wrenches <<a href="mailto:re-wrenches@lists.re-wrenches.org" target="_blank">re-wrenches@lists.re-wrenches.org</a><br></div><div><div></div><div class="h5">
<mailto:<a href="mailto:re-wrenches@lists.re-wrenches.org" target="_blank">re-wrenches@lists.re-wrenches.org</a>>><br>
Date: 2009/11/18 01:34<br>
<br>
Joel,<br>
The SMA SWR2500U inverter has been a long discontinued model.<br>
If you want to use an SMA inverter, go to the SMA website to use<br>
their excellent sizing program. Plug in the module, and your<br>
record minimum and average maximum temps for the site, and look<br>
for a current model inverter that will work. All of the "U"<br>
series inverters (except for the 700U) are discontinued models,<br>
and the "US" series are the current models.<br>
If your min temp is not below 14⁰F, it looks like you can use<br>
all 24 in one series string with the 4000US inverter, but that<br>
gets you awfully close to 600VDC (595VDC) at 14⁰F. You might<br>
want to play it safe and drop one of the modules. Unfortunately,<br>
none of the SMA inverters will operate with only 12 modules in a<br>
string (with two strings). However, a Fronius IG-3000 will, so<br>
you might want to go with that, although it has a lower efficiency.<br>
Brian Teitelbaum<br>
AEE Solar<br>
-----Original Message-----<br>
From: <a href="mailto:re-wrenches-bounces@lists.re-wrenches.org" target="_blank">re-wrenches-bounces@lists.re-wrenches.org</a><br>
<mailto:<a href="mailto:re-wrenches-bounces@lists.re-wrenches.org" target="_blank">re-wrenches-bounces@lists.re-wrenches.org</a>><br>
[mailto:<a href="mailto:re-wrenches-bounces@lists.re-wrenches.org" target="_blank">re-wrenches-bounces@lists.re-wrenches.org</a><br>
<mailto:<a href="mailto:re-wrenches-bounces@lists.re-wrenches.org" target="_blank">re-wrenches-bounces@lists.re-wrenches.org</a>>] On Behalf Of<br>
Joel Davidson<br>
Sent: Tuesday, November 17, 2009 4:56 PM<br>
To: RE-wrenches<br>
Subject: [RE-wrenches] SWR2500U Inverter<br>
Wrenches,<br>
Our customer has 24 each Kyocera KC130 modules and wants to go<br>
grid-tied.<br>
Can he use an SMA SWR2500U inverter with the fan kit? Is there a<br>
better<br>
inverter that will use all of his modules? If you have an<br>
SWR2500U or a<br>
better inverter option for sale, please contact me off-list.<br>
Thank you very<br>
much.<br>
Joel Davidson<br>
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</div></div></blockquote></div><br><br clear="all"><br>-- <br>Sunny Regards,<br>Kirpal Khalsa<br>NABCEP Certified Solar PV Installer<br>Renewable Energy Systems<br><a href="http://www.oregonsolarworks.com">www.oregonsolarworks.com</a><br>
541-218-0201 m<br>541-592-3958 o<br>