[RE-wrenches] Voltage Degradation with Uni-Solar laminate

[Bill Loesch]

Some interesting results: ie. High altitude BIPV suffers reduced 
degradation because of minimal snow loading. (I assume because of less 
flexing of the substrate?)

Array degradation was often listed as twice the module degradation. 
Offering a challenge to make the installation better?

I left those Ivory Towers d.b.a. failure analysis to avoid sitting at a 
desk but still find a fascination in their results.

Thanks, Ray,

Bill Loesch
Solar 1 - Saint Louis Solar
314 631 1094

On 03-Jun-15 11:45 PM, Ray Walters wrote:
> http://www.sciencedaily.com/releases/2014/02/140213122404.htm
> http://www.nrel.gov/docs/fy12osti/51664.pdf
> go to the conclusion on page 18.
>
> Thanks,
> R.Ray Walters
> CTO, Solarray, Inc
> Nabcep Certified PV Installer,
> Licensed Master Electrician
> Solar Design Engineer
> 303 505-8760
> On 6/1/2015 5:46 PM, jay peltz wrote:
>> HI Ray,
>>
>> Can you tell me/us where you have your data on the a-Si having higher 
>> voltage degradation over time?
>>
>> thanks
>> jay
>>
>>
>>
>> On Sun, May 31, 2015 at 11:31 AM, Ray Walters <ray at solarray.com 
>> <mailto:ray at solarray.com>> wrote:
>>
>>     Yes, amorphous modules degrade faster then crystalline cells. 15
>>     years will really start catching up with you, that's why we
>>     always tried to stick to monocrystalline when we could.
>>     I think your best option for now is to rewire the array for much
>>     higher voltage.  Even your current voltage problem aside, the
>>     system will run more efficiently at higher voltage:  Less current
>>     = less voltage drop.  I would probably just jump the 4 module
>>     sets in series in the combiner box to 8 in series. Should be a
>>     quick fix, and really show an improvement.  I've seen this same
>>     issue with low voltage polys and undersized wiring.  Usually the
>>     MPP controllers like some room to play with; as soon as the MPP
>>     voltage gets close to or less than battery voltage, the current
>>     drops off substantially.
>>
>>
>>
>>
>>     R.Ray Walters
>>     CTO, Solarray, Inc
>>     Nabcep Certified PV Installer,
>>     Licensed Master Electrician
>>     Solar Design Engineer
>>     303 505-8760  <tel:303%20505-8760>
>>
>>
>> Jay Peltz
>> Peltz Power
>> jay.peltz at gmail.com <mailto:jay.peltz at gmail.com>
>>
>>
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