point of connection [RE-wrenches]

[Larry Brown, Sunmountain]

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David,

The DC STC input  is 4800 watts on each inverter

Larry


On May 3, 2008, at 9:31 AM, David Buckner wrote:

>
> 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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