[RE-wrenches] Adding on to existing PV System

[Max Balchowsky]

Check the specs on the buss rating for that 200 amp panel. A lot of the 200 amp panels actually have a 225 amp rated buss....
 
Max Balchowsky
Design Engineer
SEE Systems
1048 Irvine Ave Suite 217
Newport Beach, Ca. 92660
760-403-6810


________________________________
From: Jason Szumlanski <Jason at fafcosolar.com>
To: RE-wrenches <re-wrenches at lists.re-wrenches.org>
Sent: Thursday, September 29, 2011 8:48 AM
Subject: [RE-wrenches] Adding on to existing PV System


We’ve been contracted to add on to an existing PV system in a residence. The existing system has a 30A 2P Breaker on a 200A rated panel with a 200A main breaker. The new system would require a 15A breaker, which would exceed the limit in NEC 690.64(B)(2).
 
The existing system has a fusible AC disconnect mounted next to the meter. This was originally intended as the utility external disconnect. The utility no longer requires a disconnect, but if we do a supply side connection, we would need a fusible AC disconnect anyway for the new system. I would collocate the new disconnect with the old.
 
Does anyone see any problem with doing a supply size connection for the new system? Any labeling snags that I might need to consider?
 
Jason Szumlanski
Fafco Solar
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