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<font size=3>Mick:<br><br>
Even with the upgrade there are still not enough slots. To do a
complete job you need the following 2 pole breakers:<br><br>
Inverter out X 3<br>
Inverter Grid in X 3<br>
Inverter Gen in X 3<br>
Grid Bypass X 1<br>
Gen Bypass X 1<br>
System output X 1 (minimum)<br><br>
The above requires 12 spaces. The new plate will fit only 9 2 pole
QOU breakers.<br><br>
There are other considerations:<br><br>
The largest QOU breaker made is 125 A. Three XW inverters will
through-transfer 180 amps, so a 125A breaker will create a bottle
neck.<br><br>
Xantrex does not (nor does anyone else) offer any means to select
from two AC sources for bypass. Think about it: if you
purchase a three XW system because the inverters offer two AC inputs, you
are screwed because there are no internal bypass options. You can
offer to provide bypass with the generator OR the grid, not both, and it
requires an external transfer switch. See page 2-37 in the
manual. Figure 2-30 offers a grid source bypass but requires the
external transfer switch. What if the grid gets hit by lightening
and takes out your inverters? You can start the generator but you
can't get power to your customer's house.<br><br>
Fortunately there are work-arounds. We spent considerable time
thinking about this and we hope to market design packages to anyone who
wants a truly complete 3 stack XW system. Contact me off
line.<br><br>
William Miller<br><br>
<br>
At 07:25 AM 10/23/2009, you wrote:<br>
<blockquote type=cite class=cite cite>Addendum: the Xantrex XW power
distribution box now ships with more breaker slots on the AC
rail...enough to accommodate that third inverter mentioned by
William.<br><br>
There is a field upgrade kit available from Xantrex at no charge, for
those who have the old style box. This is a replacement DIN rail, new
dead front with more slots, fasteners, and even a drill bit to drill out
the original rivets.<br><br>
I have the contact name for the kit, in case anyone wishes to contact me
off list...or List participant Mark Edmunds would also have that
information.<br><br>
The upgrade process is a little sketchy, because the mounting holes on my
replacement DIN rain were slightly imperfect compared to the holes in the
box. That provides another use for the courtesy drill bit...<br><br>
Mick Abraham, Proprietor<br>
<a href="http://www.abrahamsolar.com">www.abrahamsolar.com</a><br><br>
Voice: 970-731-4675</font></blockquote></body>
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