[RE-wrenches] Point of Connection 705.12D2 Exception

[Gary Willett]

Jeremy:

The XW-6048 spec for maximum AC Input Current (maximum 75% imbalance 
between L1-N, L2-N) is:
     L-N: 41.2 A    L-L: 27.5 A

So, with a Line to Neutral current of 41.2A x 1.25 = 51.5A or rounds up 
to 60A 2-pole breaker.

This condition could occur in a grid-tied configuration when the 
inverter is in AC BYPASS mode and the batteries are being charged from 
the grid.


Regards,

Gary Willett


On 12/30/2012 4:48 PM, Jeremy Rodriguez- All Solar Inc. wrote:
> Ok, so 35A min., but what about maximum?
> A 200A mains panels allows 120% max back feed correct?
> Confused.....
> Jeremy
> All Solar
> Sent via BlackBerry. Sorry for typos and shorthand!
>
> -----Original Message-----
> From: John Berdner <John.Berdner at solaredge.com>
> Date: Sun, 30 Dec 2012 23:54:17
> To: allsolar at scswifi.net<allsolar at scswifi.net>; RE-wrenches<re-wrenches at lists.re-wrenches.org>
> Subject: RE: [RE-wrenches] Point of Connection 705.12D2 Exception
>
> Jeremy:
>
> 31.25 is the minimum allowable Ampacity (25 Amps continuous) so a 35 Amp breaker would be the minimum size per Code.
> The inverter may have a higher "pass through rating" to support the loads and so is likely the reason a 60 Amp breaker is specified.
> The pass through rating is typically based on the size of the isolation relay and is usually higher than the inverter's continuous power rating.
>
> Best Regards,
>
> John Berdner
> General Manager, North America
>
>
>
> 3347 Gateway Boulevard, Fremont CA 94538 USA  (*Please note of our new address.)
> T: 510.498.3201 ext 747
> M: 530.277.4894
>
> -----Original Message-----
> From: re-wrenches-bounces at lists.re-wrenches.org [mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of Jeremy Rodriguez- All Solar Inc.
> Sent: Sunday, December 30, 2012 10:35 AM
> To: re-wrenches at lists.re-wrenches.org
> Subject: [RE-wrenches] Point of Connection 705.12D2 Exception
>
> Wrenches,
> Since the XW6048 calls for a 60A breaker to feed the inverter input and we are connecting back to the load side of a 200A panel is this correct. 6000÷240=25X1.25=31.25A. We cannot exceed a 30A breaker?  Help me understand this.
> Jeremy
> All Solar
> Sent via BlackBerry. Sorry for typos and shorthand!
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