Kinda sounds temp related.. Maybe a panel defect. You might still be able to pick it up with a good Super Soaker (change the panel temp/flex it). Just be careful not to shock them too much if they're hot (and be sure to wear your good Terminator Shades and keep a straight face). Sounds like you hit a nerve. Good luck.. let us know. db
Dan Brown
Foxfire Energy Corp.
Renewable Energy Systems
(802)-483-2564
www.Foxfire-Energy.com
NABCEP #092907-44
-------- Original Message --------
Subject: [RE-wrenches] ground fault
From: mac Lewis <maclew...@gmail.com>
Date: Tue, October 02, 2012 8:54 am
To: RE-wrenches <re-wrenches@lists.re-wrenches.org>
Hello wrenches,One of our installers has been in the process of looking for an intermittent ground fault for a couple weeks, and seems to be getting some very odd behavior. Maybe someone can help to figure out what is going on.1 A GFI fuse seems to blow after 1-2 weeks, certainly not instantaneousDoesn't appear to be related to moisture, has happened in very dry conditionsAfter jiggling the wires around a bit yesterday, and unlanding the DC strings to the inverter, he was able to see a ground to DC negative voltage of 60V. Aha! He thought, the ground fault must be 2 modules into the string from the negative homerun. They examined all of the wiring, everything looked fine, replugged it back in, and were surprised to see 120V from ground to negative at the inverter. After more jiggling, the voltage disappeared completely of course.No apparent wire damage. The change in voltage from ground to DC negative is what has me very confused.I will be heading out there today to take a look. I could use some ideas.Thanks--Mac Lewis"Yo solo sé que no sé nada." -Sócrates
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