point of connection [RE-wrenches]

[David Buckner]

Wrenches,
If Larry's line side service connection, even with its closer proximity, becomes costlier than the potential load side connection, could he feed a subpanel with the two 30A PV input breakers, then feed into the house MDP with a 40A breaker from this subpanel?  This would require calculations of DC input and resulting max AC output of the inverters.  If the inverters  won't ever be putting out 20A anyway, then the 40A (continuous duty?) breaker shouldn't be tripping and code would be met?  I'm asking, not telling.  Larry, what is the DC STC input anyway?

David
     

-----Original Message-----
From: Larry Brown, Sunmountain <sunmountain at netstep.net>
Sent: Friday, May 02, 2008 1:09 PM
To: RE-wrenches at topica.com <RE-wrenches at topica.com>
Subject: point of connection [RE-wrenches]


Wrenches,

We are doing an installation with 2 Sunny Boy 5000 inverters each  
requiring a 30 amp 2 pole breaker.  The closest point of  
interconnection is outside the house on the supply side of the main  
service disconnect near the customer side of the utility meter.   
According to 690.64B on the load side we are limited to 120% of the  
busbar rating, which means we could not put 2- 30 amp backfeed  
breakers in the main 200 amp service panel.  But 690.64A does not  
state a limitation  of 120% .  So we are considering a 200 amp feed  
through panel, also recommended by our local electrical inspector,  
and then putting our 2-30 amp 2 pole breakers in this feed thru  
panel. Anyone have any comments on this method? What other methods  
are people using to make a supply side interconnection?

Larry Brown
Sun Mountain


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