FW: Sunny Island [RE-wrenches]

[Damian de Caires]

Here is a little mistake I made on my schematic from wiring the SI into
the outback psx240 transformer.  The psx240 can be pushed to 35amps/2p
from 25a/2p when the fan kit is added.  SMA originally recommended this
to me but in the outback manual it is only mentioned if two units are
wired in parallel and the fan kit is added.  I got a verbal confirmation
on the phone that it can be done even in a single transformer set up.
However outback does not carry 35amp breakers, and the psx has din rail
slots for 2 breakers : (  I figured out that the breakers are infact not
manufactured by outback but rather qz type from cbi inc.  (pn# qz
1-13-d-2-35).  I was reviewing my initial plans where I removed the two
25 amps installed a 35 single on the 120 side of the island backup and a
2p/35 on the 240 side of the backup.  However on L1 two 35a/1p are
entering the ac bus and therefore 70a is available on that phase and
there goes the xformer.  So behind the ac bus L1 I got a 35a/1p qz
breaker to protect the xformer.  L2 is only fed by a 35/1p on the 240
side of the island backup so that is adequately protected.  The fan is
not protected and is fed from a 35 amp breaker, now all the outback wire
diagrams show it this way but since I had an extra slot on the din rail
I added in a fuse holder which is the standard size we use with outback
combiners and equal in size to the empty qz slot put in a fuse rated to
.5amps @120vac and now it is all correct.  Also on the 120 side of the
ac backup load it requires a 70a/1p since 35 amps enters directly from
L1 via a short on the busbar, and L2 switches phase across the
transformer to bridge onto L1.  Be careful with this one I had a lot of
people look at this schematic and did not catch it since they did not
look closely enough. 




-----Original Message-----
From: John Berdner [mailto:jberdner at sma-america.com] 
Sent: Thursday, November 09, 2006 12:57 PM
To: RE-wrenches at topica.com
Subject: Re: Sunny Island [RE-wrenches]


Damian / Wrenches:
 
The existing SI4248U is UL 1741 compliant but it WILL NOT back feed the
grid.
This means it is not classified as a utility interactive inverter
(since there is no back feed current to be interactive).
 
The new SI5048U will be UL 1741 compliant and also WILL back feed the
grid.
The new 5048 is also 3 phase capable and can be stacked in parallel up
to 4 clusters (of three per cluster).
The 5048 should be available late in 1Q2007 depending on UL testing
schedule.
 
Hope this helps.
 
Best Regards,
 
John Berdner


>>> damian at thesolarcenter.com 11/1/2006 04:26:17 AM >>>

So you can cluster 4 in three phase (12 units) ? Also I thought the si

is not required to be complant with 1741 because it never backfeeds the

grid
-Damian de Caires (Damian at thesolarcenter.com 






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