[RE-wrenches] Trina Module Annual Degradation

[Bill Hoffer]

Jerry

Unfortunately snail trails are a clear indication of micro cracks that will
in time open up and degrade the output of the module substantially.  They
may not have a performance problem yet , but give it time to show up!  It
usually takes awhile for the snail trail to appear, the micro cracks allow
ions to pass through the cell attracted by the polarity and cause the
discoloration around the micro cracks.  I have heard of initial installs
with them , which is a very bad sign, and the same response from the
manufacturer that it does not effect performance ( yes they were flash
tested with the micro cracks present).  IMHO it is a manufacturing defect
and has nothing to do with performance....yet, and should be covered under
manufacturing defects!  Good luck with that though!  I am sure that we have
had this problem all along, but because we are seeing 1000 vdc
transformer-less systems it is occurring more quickly.

Bill Hoffer

On Thu, Jul 16, 2015 at 10:33 PM, jerrysgarage01 <jerrysgarage01 at gmail.com>
wrote:

> Wrenches
> We used to use Sharp but now its Trina,  containers of 250 watt modules,
>  data logging has not shown any abnormal power loss. Now that I say this
> Trina as the story  goes debates there data so that is true it softens the
> blow a little. I have seen  some another brand that are cracking poly cells
> looks like snail tracks, manufacture says it does not effect performance
> Jerry
>
>
> Sent via the Samsung Galaxy S™ III, an AT&T 4G LTE smartphone
>
>
> -------- Original message --------
> From: boB at midnitesolar.com
> Date:07/16/2015 4:01 PM (GMT-10:00)
> To: RE-wrenches
> Subject: Re: [RE-wrenches] Trina Module Annual Degradation
>
>
>
> It's too bad that when a module goes to a REAL high degradation, like,
> 100% down to nothing
> before that 25 year "warranty" is up, that it is NOT considered
> degradation and is not covered
> under "warranty".
>
> P.S. This has nothing to do with Trina or any PV company in particular.
>
> boB
>
> On 7/16/2015 6:24 PM, jay wrote:
> > HI Peter,
> >
> > I’ll bite.
> >
> >  From the folks I know who deal with multi mega watt systems, are seeing
> less than  that level of degradation.
> >
> > That said, the standard module  25 yr warranty to 80% is just on .7%
> year if I have my math correct.
> >
> > jay
> >
> > peltz power
> >
> >
> >
> >
> >> On Jul 16, 2015, at 9:08 AM, Peter Parrish <
> peter.parrish at calsolareng.com> wrote:
> >>
> >> I have recently been in discussion with a company that builds a large
> number
> >> of medium-sized PV ground mount system (30 kW to over 100 kW). They
> claim
> >> that they have been seeing something on the order of 0.7% annual
> degradation
> >> in the output of their systems due to intrinsic degradation in the PV
> >> modules. They also claim that this number is supported by the PV module
> >> manufacturer. Many years ago (2007?) I remember reading a report
> containing
> >> data gathered by NREL that showed the number was about 0.4%, and I
> thought
> >> the number was actually decreasing over time.
> >>
> >> The module in question is the Trina TSM-310 (PA14.8, I believe, if it
> makes
> >> any difference).
> >>
> >> Has anyone read anything recent about annual degradation in general or
> Trina
> >> modules in particular?
> >>
> >> - Peter
> >>
> >> Peter T. Parrish, Ph.D.
> >> President, SolarGnosis
> >> 1107 Fair Oaks Ave. Suite 351
> >> South Pasadena, CA 91030
> >> NABCEP Certified PV Installer #031806-26
> >> (323) 839-6108
> >> petertor at pobox.com
> >>
> >>
>
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-- 
William Hoffer
161 SE Fourth Ave
P.O. Box 1823
White Salmon, WA 98672-1823
sunengser at gmail.com <bhoffer at sunergyengineeringservices.com>
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