

Could the battery SOC be the reason you see the module current at 60% STC
rating?

Dick Ratico

--- You wrote:
I've seen 1300 sustained at 6000 feet and 1800 edge of cloud too. 

Brian

Typos courtesy of my iPhone. 

On Aug 29, 2012, at 1:56 PM, Nathan Jones <solardude97@yahoo.com> wrote:

> 
> 
> Ray,
> I lived at altitude for many years but before being in this business. Never
had a meter up there of course but I was always aware of the heightened power
from the sun. Two miles less atmosphere to diffuse the power of the light. My
gut and your realistic readings in low light say the meter is spot on. I would
have expected higher numbers than STC but did not know it would be that much.
> Others may have a multiplier to use with STC for altitude that could confirm
your numbers.
> Nathan Jones
> Power Source Solar
> 
> ------------------------------
> On Wed, Aug 29, 2012 12:26 PM CDT R Ray Walters wrote:
> 
>> Hi All;
>> 
>> I was recently at a mountain top solar site (11,000 ft), doing some testing,
and I measured insolation values that were averaging 1400w/m2, with a temporary
peak (edge of cloud effect) that hit 1800w/m2.
>> Do I need to my meter recalibrated?  Its the Daystar, and seems to be
accurate,  when we got some cloud cover, insolation dropped to 200-300 w/m2 as
expected.
>> 
>> Interstingly the aging Photowatt 1000 modules were running at only about 60%
of rated output current into a Blue Sky 3048 MPPT controller.  So I'm also
wondering if I have faulty modules.  Back of module temps were about 95 deg F.
>> Any help on both the high insolation reading or Photowatt troubles would be
great.
>> 
>> Thanks in Advance,
>> 
>> Ray Walters
>> 
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