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

[jay peltz]

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> 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 Engineer303 505-8760
>
>
Jay Peltz
Peltz Power
jay.peltz at gmail.com
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