[RE-wrenches] SWR2500U Inverter
Dave Click
daveclick at fsec.ucf.edu
Wed Nov 18 12:15:28 PST 2009
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 <solarworks at gmail.com>
To: RE-wrenches <re-wrenches at 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 <daveclick at fsec.ucf.edu
> <mailto:daveclick at 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 <reellison at gmail.com <mailto:reellison at gmail.com>>
> To: RE-wrenches <re-wrenches at lists.re-wrenches.org
> <mailto:re-wrenches at 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
> <daveclick at fsec.ucf.edu <mailto:daveclick at fsec.ucf.edu>
> <mailto:daveclick at fsec.ucf.edu <mailto:daveclick at 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 <bteitelbaum at aeesolar.com
> <mailto:bteitelbaum at aeesolar.com>
> <mailto:bteitelbaum at aeesolar.com
> <mailto:bteitelbaum at aeesolar.com>>>
> To: RE-wrenches <re-wrenches at lists.re-wrenches.org
> <mailto:re-wrenches at lists.re-wrenches.org>
> <mailto:re-wrenches at lists.re-wrenches.org
> <mailto:re-wrenches at 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-bounces at lists.re-wrenches.org
> <mailto:re-wrenches-bounces at lists.re-wrenches.org>
> <mailto:re-wrenches-bounces at lists.re-wrenches.org
> <mailto:re-wrenches-bounces at lists.re-wrenches.org>>
> [mailto:re-wrenches-bounces at lists.re-wrenches.org
> <mailto:re-wrenches-bounces at lists.re-wrenches.org>
> <mailto:re-wrenches-bounces at lists.re-wrenches.org
> <mailto:re-wrenches-bounces at 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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