Backfeeding a 200 amp panel with an Outback 3048 [RE-wrenches]

Allan Sindelar allan at positiveenergysolar.com
Wed Oct 11 14:41:01 PDT 2006


Andrew,
No, 175A. If it's a 200A panel, you can't put a main breaker larger than
that in it. 200A is the busbar rating of the panel - but check the label:
you might have a panel with a 200A main breaker and a higher busbar rating -
then you're OK.

Check out NEC 690.64b(2). It's the sum of all sources that can't exceed 120%
of the busbar rating of the panel. In your case, 120% of 200A is 240A. With
a 200A main breaker, you can also have a 40A inverter feed. If you put in a
60A, that would be 130%. Put in a 175A main breaker, and 175 + 60 = 235A,
which is within 120%.

Allan

----- Original Message ----- 
From: "Andrew Truitt" <atruitt at gmail.com>
>
> Do you mean 275A?
>
> On 10/11/06, Allan Sindelar <allan at positiveenergysolar.com> wrote:
> >
> > Andrew,
> > Nope, if it has a 200A main breaker; 40A is all you get. If you put in a
> > 175A main breaker, OK.
> > Allan
> >
> > ----- Original Message -----
> > From: "Andrew Truitt" <atruitt at gmail.com>
> > >
> > > Is it legit to backfeed a 200 amp main panel with the 1 pole, 60 amp
> > > breaker that is recommended for the Outback FXGT 3048 considering the
> > > 20% rule?  I know that most of that amperage is pass through, as the
> > > most a 3kW inverter should be able to produce at 120V is 25 amps, but
> > > the manual says that the largest instantaneous output current is 70
> > > amps.


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