Re: [RE-wrenches] Microfractures in PV Modules

[William Dorsett]

Does this suggest that it is better to buy monocrystalline cell modules
instead of poly; and that those modules that flash test with the highest
output for a given production run have the best printed connections and
therefore the higher probability of long term life and performance?

Bill Dorsett
Manhattan, KS

-Original Message-
From: RE-wrenches [mailto:re-wrenches-boun...@lists.re-wrenches.org] On
Behalf Of Christopher Warfel
Sent: Saturday, October 04, 2014 10:21 AM
To: re-wrenches@lists.re-wrenches.org
Subject: [RE-wrenches] Microfractures in PV Modules

Recently a inspector raised the issue of microfractures in pv modules, and
that the existence of such fractures would require replacement of the
modules and a failing of the system inspection. I found information from
NREL confirming the existence of microfractures in poly crystalline.
However, I have not seen any information on how to detect them (ie, what
they look like).  Does anyone have a reference that shows this, and is this
a valid concern for the industry?  Thank you, Chris






--
Christopher Warfel, President
ENTECH Engineering, Inc.
PO Box 871, Block Island, RI 02807
401-466-8978

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Re: [RE-wrenches] offsetting generator loads with PV

[Conrad Geyser]

Hi Jerry,

Most of these sites have intermittent grid and onsite full sized
generators.  When the grid is up, it supports net metering.  So I'm hoping
to be able to program inverters for grid tied and generator tied.

When the grid is up, it is a large scale grid.

thanks,

Conrad


On Sun, Oct 5, 2014 at 12:32 AM, Jerry Shafer jerrysgarag...@gmail.com
wrote:

 I have done some work in central America where there was only a genny down
 the road that supplied power and it would only run if someone put fuel in
 it, is this your issue also.
 Jerry












 On Sat, Oct 4, 2014 at 7:37 AM, Conrad Geyser conr...@cape.com wrote:

 Esteemed wrenchies,

 I'm working on Integrating PV with a group in the Caribbean on commercial
 sites with intermittent gird power.  Need to be able to work grid tied and
 generator tied.  No UL 1741.  Anybody worked with this? Need some
 consulting and/or therapy.

 always a pleasure,

 Conrad
 NABCEP PV and thermal
 Cotuit Solar LLC, etc.


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