calculation [RE-wrenches]
Kurt Albershardt
info at es-ee.com
Wed Jan 18 14:09:10 PST 2006
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--On Wednesday, January 18, 2006 1:51 PM -0800 Tom McCalmont <tom at regrid.com> wrote:
>
> You can downgrade the main breaker of the panel to keep within the
> NEC-mandated restriction. The limitation is on the busbars of the panel.
> Therefore, you can source up to 240A of current into a 200A panel (20% over
> capacity).
>
> If you downgraded the main breaker to 150A, then you'd have 90A of
> "headroom" for solar sourcing breakers. This is more than enough for a 10kW
> solar system. Since on most days both the solar system and the grid are
> available to feed power to the panel, the 150A limit of the main breaker
> should never be reached during the day.
There are also a number of 225A panels which would give you a tad more headroom.
.
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