New IEEE neutral sensing BS [RE-wrenches]

[David Brearley]

William,

The SMA6000 (the ones that we have all been installing for a couple years,
not necessarily the new ones) will accommodate an open delta.  There is a
jumper configuration (near the transformer tap wires) that can configure the
device for a neutral or no neutral configuration.  This is detailed in the
manual.  While the new IEEE standards are particularly inconvenient on the
manufacturers, they are probably not a requirement for the installer.  

Regards,

David Brearley
NABCEP Certified Solar PV System Installer (TM)
 
Meridian Energy Systems
(TECL #24461)
2300 S. Lamar, Suite 107
Austin, TX 78704
512-448-0055 (ph)
512-448-0045 (fax)
www.meridiansolar.com
 

-----Original Message-----
From: William Miller [mailto:wrmiller at charter.net] 
Sent: Thursday, May 03, 2007 4:37 PM
To: RE-wrenches at topica.com
Subject: New IEEE neutral sensing BS [RE-wrenches]


Friends:

I knew it was coming but I did not see the implications:

The new standard requires that inverters sense phase-to-neutral 
voltage.  We just installed a Xantrex GT5 in a commercial setting with an 
"Open Delta" configuration.  We had to do a line side tap in order to 
comply with NEC 690-64.  Space for line taps was tight so I chose the two 
leads with the most room.  One was the stinger-- and the new IEEE compliant 
inverter would not operate on the stinger.

My lead electrician is on site now and I do not envy the contortions he is 
going through to relocate the tap connector.  Furthermore, if we wanted to 
put in more than one inverter (ideally three), we can not balance our 
inverters on phases.

This is a real down side to the new regulation and grounds for insisting 
that a means be included to adjust the window or disable neutral sensing.

Bill Brooks, John Wiles,  comments?

William Miller


__________________________________________________________________
William Miller
Miller Power and Communications
Voice :805-438-5600     Fax: 805-438-4607
email: wrmiller at mpandc.com
http://mpandc.com
License No. C-10-773985


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