It's of course your call as to what factors to use, and you can go as
conservative as you want. When the sun hits the array and kicks the VOC
up, it's also going to be warming the modules, which will of course
knock the VOC back down. At 200 W/m2 you'll have about 90% of your VOC,
which will turn the inverter on and move the array to its VMP. I could
see the array topping 600VDC if it's a record cold temperature in the
middle of the day, and the power goes out at noon, and the array is
angled steeply enough to see >600 W/m2 and get its VOC up, and you have
30 mph wind gusts keeping the array relatively close to ambient
temperature. And it would need to be a newer array; a new array with a
600V VOC would be expected to lose at least 2-3V from that every year,
right?
That's why I feel confident using the ASHRAE numbers.
DKC
-------- Original Message --------
Subject: Re: [RE-wrenches] SWR2500U Inverter
From: Kirpal Khalsa <solarwo...@gmail.com>
To: RE-wrenches <re-wrenches@lists.re-wrenches.org>
Date: 2009/11/18 11:33
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.....
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...
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!
Cheers,
--
Sunny Regards,
Kirpal Khalsa
NABCEP Certified Solar PV Installer
Renewable Energy Systems
www.oregonsolarworks.com <http://www.oregonsolarworks.com/>
541-218-0201 m
541-592-3958 o
On Wed, Nov 18, 2009 at 8:14 AM, Dave Click <davecl...@fsec.ucf.edu
<mailto:davecl...@fsec.ucf.edu>> wrote:
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).
http://www.brooksolar.com/files/Expedited_Explanation-5-6-09.pdf
DKC
-------- Original Message --------
Subject: Re: [RE-wrenches] SWR2500U Inverter
From: robert ellison <reelli...@gmail.com <mailto:reelli...@gmail.com>>
To: RE-wrenches <re-wrenches@lists.re-wrenches.org
<mailto:re-wrenches@lists.re-wrenches.org>>
Date: 2009/11/18 11:01
My eyes must be bad, i just looked at the entire list 3 times
and New York state is not on it anywhere.
I have see 48 below and just wanted to see what the averages
ctually were.
Bob
On Wed, Nov 18, 2009 at 7:30 AM, Dave Click
<davecl...@fsec.ucf.edu <mailto:davecl...@fsec.ucf.edu>
<mailto:davecl...@fsec.ucf.edu <mailto:davecl...@fsec.ucf.edu>>>
wrote:
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
<http://www.pvselect.com>
<http://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
<mailto:bteitelb...@aeesolar.com>
<mailto:bteitelb...@aeesolar.com
<mailto:bteitelb...@aeesolar.com>>>
To: RE-wrenches <re-wrenches@lists.re-wrenches.org
<mailto:re-wrenches@lists.re-wrenches.org>
<mailto:re-wrenches@lists.re-wrenches.org
<mailto: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>
<mailto:re-wrenches-boun...@lists.re-wrenches.org
<mailto:re-wrenches-boun...@lists.re-wrenches.org>>
[mailto:re-wrenches-boun...@lists.re-wrenches.org
<mailto:re-wrenches-boun...@lists.re-wrenches.org>
<mailto: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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--
Sunny Regards,
Kirpal Khalsa
NABCEP Certified Solar PV Installer
Renewable Energy Systems
www.oregonsolarworks.com <http://www.oregonsolarworks.com>
541-218-0201 m
541-592-3958 o
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