[RE-wrenches] fronius IG Plus practical engineering WAA??? (Mark Frye)

greg at remotepowerinc.com greg at remotepowerinc.com
Sun Jun 21 12:59:41 PDT 2009


Mark,

Would you mind posting a link - if you have it - to the Data Bulletin on
the HU361 you spoke of?  I'm sure I can find it on the Sq D site if you
don't

Thanks!

Greg Egan



> Date: Sun, 21 Jun 2009 09:22:43 -0700
> From: "Mark Frye" <markf at berkeleysolar.com>
> Subject: Re: [RE-wrenches] fronius IG Plus practical engineering
> 	WAA???
> To: "'RE-wrenches'" <re-wrenches at lists.re-wrenches.org>
> Message-ID: <A0844770FC7D484881555EF8E5537E0B at marksdell>
> Content-Type: text/plain; charset="us-ascii"
>
> Bob-O,
>
> I noticed your comment about the HU361 and went back and reviewed the Data
> Bulletin, Direct Current and Photovoltaic Systems, 08/2005.
>
> This confirmed my understanding that the limiting factor on the 30A switch
> in a photovoltaic applications is not 30A * 0.8.  The limiting factor is
> 18A
> per pole or 11.5A Isc per pole.
>
> Depending on the modules used, this may or may not preclude doubling up
> strings on individual poles.
>
> Mark Frye
> Berkeley Solar Electric Systems
> 303 Redbud Way
> Nevada City,  CA 95959
> (530) 401-8024
>  <http://www.berkeleysolar.com/> www.berkeleysolar.com
>
>
>   _____
>
> From: re-wrenches-bounces at lists.re-wrenches.org
> [mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of Bob-O
> Schultze
> Sent: Saturday, June 20, 2009 2:36 PM
> To: RE-wrenches
> Subject: Re: [RE-wrenches] fronius IG Plus practical engineering WAA???
>
>
> Nick,
> Fronius sells a heavy copper buss bar which will link all the six inputs
> together. They look sort of like the Outback PSPV bus bars except copper
> and
> MUCH heavier. If you need four or more inputs you'll need to get two of
> them. Three or less, cut one in half.  For some reason known only to
> Fronius
> in Austria, if Fronius US orders two of those buss bars in one packet, it
> costs more than two ordered separately. Drives Gord nuts, but that's the
> way
> it is. I just installed a 11.4Plus recently with the buss bars and it
> worked
> out pretty well. I never looked to see if there were individual fuses but
> it
> worked right out of the box, so....?
> Combining on the roof with HV touchsafe fuses and holders is still the way
> to go, IMO, however if you are going to use a HU361 DC Disconnect at the
> inverter with four strings, you will likely need to run down two sets of
> home runs so as not to overload the poles which need to be derated from
> 30A
> by the usual 20%. Or, go to a 60A Disco which is probably more expensive
> than a second set of wires.
> Hope this helps.
> Bob-O
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