SB's in high temperature (was lemmings) [RE-wrenches]

[jberdner at sma-america.com]

Joel:

UL established the power rating our inverter at 2500 Watts.
You can certainly design the system around 2200 Watts and it will run
just fine.

I am a member of the Standards committee at UL and we are proposing
changing to UL 1741 the way power ratings are established to make power
rating better reflect real world conditions.  This will give us a level
playing field for inverter power ratings (for both grid tied and off
grid) that better reflects the needs of customers.

If you have any questions, or if I can be of any further assistance,
please do not hesitate to contact me.

Best Regards,

John Berdner

SMA America, Inc.
12438 Loma Rica Drive, Unit C
Grass Valley, CA  95945
530.273.4595 (voice)
530.274.7271 (fax) 


-----Original Message-----
From: Joel Davidson [mailto:joeldavidson at earthlink.net] 
Sent: Thursday, February 06, 2003 3:05 PM
To: RE-wrenches at topica.com
Subject: Re: SB's in high temperature (was lemmings) [RE-wrenches]

John,
I think you will sell just as many Sunny Boy inverters if you rate them
2.2
kW instead of 2.5 kW.
Best regards,
Joel Davidson

jberdner at sma-america.com wrote:

> Graham:
>
> While you can use the Sunny Boy + Breeze scenario there is another
more
> conservative approach is reliability and longevity are of paramount
> concern.
> If you undersize the array by 10 to 15% there should be no issue at
103
> F.  This approach adds no additional hardware and not pushing the
> inverter to its limits will certainly extend it's life. There is a
rule
> of thumb in power electronics (I forget who's rule it is) - for every
> 10C decrease in temperature the life is doubled. This is true for all
> power electronics not just our inverters.
>
> Fan Life - In building the Sunny Breeze we selected a fan with 30 k
> hours MTBF.  The 2 to 3 year estimate for life is out estimate for
> outdoor, unprotected mounting.  If mounted indoors it will run more
> frequently but the life of the fan should certainly be well beyond the
> warranty period.
>
> If you have any questions, or if I can be of any further assistance,
> please do not hesitate to contact me.
>
> Best Regards,
>
> John Berdner
>
> SMA America, Inc.
> 12438 Loma Rica Drive, Unit C
> Grass Valley, CA  95945
> 530.273.4595 (voice)
> 530.274.7271 (fax)
>

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