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Looking at the pictures again, I wonder if there might be a pinhole in the back lamination that is allowing water into the module. </div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> RE-wrenches <re-wrenches-bounces@lists.re-wrenches.org> on behalf of Jon Dixon via RE-wrenches <re-wrenches@lists.re-wrenches.org><br>
<b>Sent:</b> Wednesday, October 23, 2024 9:07 AM<br>
<b>To:</b> re-wrenches@lists.re-wrenches.org <re-wrenches@lists.re-wrenches.org><br>
<b>Cc:</b> Jon Dixon <jon@dixonpowersystems.com><br>
<b>Subject:</b> [RE-wrenches] Module snail trails</font>
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<div>Hello All, <br>
<br>
I have a local utility with a 50Kw array installed in 2015 consisting of 200 ReneSola 250w modules and 3 SMA Tripower 15000TL-US -10. They are having Arc fault code on two of the inverters. This has been going on for a few years now. It happens a couple times
a year generally after a large rain. They just reset the code and it comes back to life.
<br>
<br>
They gave me a walk through and we noticed that a number of modules have snail trails. I have attached a closeup picture I took and IR views of affected module and non affected. It was a 90 deg day when the utility took the IR pictures.
<br>
<br>
Causes for snail trails that I found:<br>
<ul class="x_wp-block-list">
<li>The difference in chemical properties of EVA foils and the silver contacts</li><li>The degradation extent of the EVA material</li><li>Water vapor permeability of the solar panel’s backsheet material</li></ul>
I did find that if you have snail trails you will have micro fractures. I did see some info that micro fractures could cause arc faults.
<br>
<br>
Finally my question is can snail trails cause arc faults also? <br>
<br>
<br>
Thanks Jon
<pre class="x_moz-signature" cols="72">--
Jonathan Dixon
Dixon Power Systems
3250 N 20th St Ste 1
Lincoln, NE 68521
402-467-3240
<a class="x_moz-txt-link-abbreviated" href="mailto:jon@dixonpowersystems.com">jon@dixonpowersystems.com</a></pre>
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