Inverter protection [RE-wrenches]

[allan]

Travis,
    Yes, I was confusing.  I was responding to the original post about
Trace's approach that will feed the inverters from any input sources.  It
went out as a response to your response.
    My points are 1) use two input breakers to isolate the Co from both the
batteries and the charging source, and 2) tie to the battery side of the big
breaker, not the inverter side.  You appear to be achieving the same thing.
Sorry for the confusion.

Allan at Positive E
-----Original Message-----
From: Travis Creswell, Ozark Solar <ozsolar at ipa.net>
To: RE-wrenches at topica.com <RE-wrenches at topica.com>
Date: Monday, December 04, 2000 1:11 PM
Subject: Re: Inverter protection [RE-wrenches]


>Allan,
>
>I'm confused by your email, it seems to conflict itself.  Please read my
>email again and make sure I wrote it clearly and make sure you understand
it
>clearly. For clarity (after the fact) I am only talking about a Power Panel
>with the PPO-C40 option which includes the 60 amp breaker.  The DC charging
>source is still wired to the 60 amp breaker supplied with the Power Panel
>but is moved from feeding the top to the bottom of the DC250.  How is what
>Bob-O describing different from what I am describing except that Bob-O
>describes pushing a wire in the same lug that is only designed for one wire
>which doesn't meet code in this application.
>
>In your email you mention running the array input to the "battery side of
>the big breaker".  How are you are fusing/disconnecting the array input
wire
>from the "big breaker"?  I think we are describing the same thing expect
>mine never leaves the DC250 which does meet code and is UL listed to do.
>
>we'll use a separate QO2-4/70 box for the
>>array input.  In either case, we run to the battery side of the big
breaker.
>
>vs.
>
> Your only options I think, would be to shove a wire up with the
>>4/0 on the hot side of the big CB, feed it to a smaller downstream CB
>>or safety switch and
>
>vs.
>
>>Also you still need to provide over current protection on the source
>>circuit.  The only draw back I have seen in doing it this way is the the
250
>>AMP breaker sees the total current coming from the batteries and the DC
>>charging sources.
>
>
>
>I'll read through my code book to get some more clarity but the utility
side
>of all "service equipment" that I work on and install daily is rarely
>disconnectable.  Even if you go to the disconnect on the outside of the
>building or to the meter at the base of the pole the utility side is always
>hot.
>
>Thanks
>Travis
>----------
>>From: allan <allan at positivenergy.com>
>>To: RE-wrenches at topica.com
>>Subject: Re: Inverter protection [RE-wrenches]
>>Date: Mon, Dec 4, 2000, 12:28 PM
>>
>
>>Travis,
>>    Bob-O is right on this.  Code requires that all "service equipment" be
>>isolatable from all power sources.  Trace is using the 250 as one
disconnect
>>for the C40.
>
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