Just a note here- rather than using the record lows, you can go back to
the future and use the ASHRAE minimum expected temperatures as the 2011
NEC will allow explicitly. In the '08, it says to use the "lowest
expected ambient temperature," for which the ASHRAE temperatures are
more appropriate than record lows. These ASHRAE temps will be higher
than the record lows and will add a little more cushion there at 600 VDC.
So where to get these temperatures? Starting on page 47:
http://www.solarabcs.org/permitting/Expermitprocess.pdf
Also, in case you didn't know, www.pvselect.com is another option for
string sizing that features multiple inverters and a 1 degree
temperature step rather than the 9 degree (F) temperature step on the
SMA sizer. They have the Kyocera KD130 in their database, but not the KC130.
DKC
-------- Original Message --------
Subject: Re: [RE-wrenches] SWR2500U Inverter
From: Brian Teitelbaum <bteitelb...@aeesolar.com>
To: RE-wrenches <re-wrenches@lists.re-wrenches.org>
Date: 2009/11/18 01:34
Joel,
The SMA SWR2500U inverter has been a long discontinued model. If you
want to use an SMA inverter, go to the SMA website to use their
excellent sizing program. Plug in the module, and your record minimum
and average maximum temps for the site, and look for a current model
inverter that will work. All of the "U" series inverters (except for the
700U) are discontinued models, and the "US" series are the current models.
If your min temp is not below 14⁰F, it looks like you can use all 24 in
one series string with the 4000US inverter, but that gets you awfully
close to 600VDC (595VDC) at 14⁰F. You might want to play it safe and
drop one of the modules. Unfortunately, none of the SMA inverters will
operate with only 12 modules in a string (with two strings). However, a
Fronius IG-3000 will, so you might want to go with that, although it has
a lower efficiency.
Brian Teitelbaum
AEE Solar
-----Original Message-----
From: re-wrenches-boun...@lists.re-wrenches.org
[mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of Joel
Davidson
Sent: Tuesday, November 17, 2009 4:56 PM
To: RE-wrenches
Subject: [RE-wrenches] SWR2500U Inverter
Wrenches,
Our customer has 24 each Kyocera KC130 modules and wants to go grid-tied.
Can he use an SMA SWR2500U inverter with the fan kit? Is there a better
inverter that will use all of his modules? If you have an SWR2500U or a
better inverter option for sale, please contact me off-list. Thank you very
much.
Joel Davidson
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