Sunny Boy Max input Voltage [RE-wrenches]

matthew tritt solarone at charter.net
Wed Oct 9 16:58:24 PDT 2002


Travis,

I've had great success with SMA's online system sizer, but it doesn't seem
to be totally functional today.
the address is www.sma_america.com

Give it a try!

Matt
----- Original Message -----
From: "Travis Creswell, Ozark Solar" <ozsolar at ipa.net>
To: "RE-wrenches" <RE-wrenches at topica.com>
Sent: Wednesday, October 09, 2002 4:24 PM
Subject: Sunny Boy Max input Voltage [RE-wrenches]


> Hello All,
>
> I am looking at putting 12 Sharp 175's modules in series for a Sunny Boy
> installation I am preparing to do.  12 is the magic number as that is the
> most you can put on a AZ300 tracker.  6 modules in series is under the
> minimum input voltage so I can't break the array up into two strings.   So
> if I want to use Sharp 175's and max out the capacity of the AZ300 and I
am
> stuck with 12 modules.  Before I do any temp correction that comes up to
533
> volts OCV (12x44.4).
>
> It rarely gets under 0 degrees F here in the Ozarks but we have had some
> days where we woke up to -10F.  Maybe once every 5 years. That puts me at
> over 600 V open circuit (Sharp supplies a .144v/C correction factor for
> these modules).  Actually, any time the module temp gets under 8F the OCV
is
> over 600V.   Sharp's voltage correction factor seem very high to me.
>
> So what happens if a Sunny Boy sees just a little over 600 OCV?  Does the
> magic, German made, smoke come out?
>
> Thanks
> Travis Creswell
> Ozark Energy Services
>
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