[SPAM] - Sunnyboy ground fault mystery [RE-wrenches] - Email found in subjec

Jason Fisher jfisher at nahbrc.org
Wed Feb 25 12:11:28 PST 2004


Kirk,

You may want to rent or otherwise get a hold of a small Megger tester
and test the suspect module when physically isolated (i.e. removed). I'd
recommend no higher than a 500V setting for the test and would suggest
starting with a lower setting first. 

Jason Fisher
Aurora Energy
Annapolis, MD


-----Original Message-----
From: Kirk Herander, VSE [mailto:kirk at vtsolar.com] 
Sent: Wednesday, February 25, 2004 2:11 PM
To: RE-wrenches at topica.com
Subject: [SPAM] - Sunnyboy ground fault mystery [RE-wrenches] - Email
found in subject

Hey folks,

I have a system comprising of -6- old 60volt Mobil RA-180 ribbon silicon
modules wired to a SunnyBoy 2500U inverter. The modules are mounted on a
metal top-of-pole rack. The inverter detected a ground fault upon
start-up.
The open ciruit array voltage is 323 vdc. I measured the voltage from
the pole to array pos. at +133 vdc. The measurement from pole to array
neg.
is -190 vdc. So it would appear that perhaps there is a short from the
3rd module internally to the rack and pole. Its looks like the array
voltage is "center-tapped" to ground somehow. However I isolated every
module and did not find a short. I also isolated and bugged out inverter
and  DC disconnect wiring and couldn't find a short either. Any ideas on
how to solve this mystery would be greatly appreciated.

thanks, Kirk

Vermont Solar Engineering
Kirk Herander
North American Board of Certified Energy Practitioners Certified Solar
PV Installer(TM) Xantrex Certified Dealer Charter Member
NYSERDA-eligible installer Vermont Solar and Wind Partner

PO Box 697
Burlington, VT. 05402
www.vermontsolar.com
www.backeastsolar.com
800.286.1252 - 802.863.1202
fax 802.863.7908

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