Brian:
We reviewed the installation instructions and found them lacking in a few
regards:
1. The Xantrex system allows for bypass of the inverters only with external
devices and they do not allow choosing between inverter, utility *or*
generator.
2. The diagram on page 2-36 shows nine 2 pole breakers. Today I counted
the spaces available for breakers and again this evening via job
photographs, and I see only room for eight 2 pole breakers. I will check
this again tomorrow, but I do not think the Xantrex suggested breaker
arrangement will actually fit.
I have been toying with this dilemma. With 5 breakers on the output, one
could contrive to select between utility, generator *or* inverter for
output bypassing. This, unfortunately, leaves inadequate room for inverter
input breakers.
I think the ideal scenario would use two Power Distribution Panels. One
would be dedicated to AC and the other to DC (this would be even ore ideal
if the PDP did not cost an unbelievable amount of money). A power flow
diagram of how Xantrex suggests this be wired and also of another concept I
have been developing are on our web site
at: http://millersolar.com/practices/Technical_Procedures/xw/3XW.html
Thanks for the input.
William Miller
At 10:00 PM 4/28/2009, you wrote:
Content-Language: en-US
Content-Type: multipart/alternative;
boundary="_000_69FFF3377EEF8747A4FDE2CC20CD1DEDA66442A92DREDEXCHaeesol_"
William,
In the Xantrex "XW Power System Installation Guide", pages 2-34 to 2-37,
there is a parts list and some diagrams on the wiring of a 3-inverter
system. The parts list calls for two 5 ft (62" hole-to-hole) 4/0 battery
cables to connect the third inverter up to the Distribution Panel.
Also shown is the use of an external bypass switch to make up for the lack
of enough AC breaker spaces in a single Distribution Panel. It shows a
breaker/interlock panel, but a 2-pole manual transfer switch will also
work. Either way, it should be rated for at least 200A.
Brian Teitelbaum
AEE Solar
From: [email protected]
[mailto:[email protected]] On Behalf Of William Miller
Sent: Tuesday, April 28, 2009 8:49 PM
To: RE-wrenches
Subject: [RE-wrenches] 3 Xantrex XW system
Friends:
We are in the midst of installing our first 3 XW system. Several
questions arose during our work today. I appreciate input any of you
might have.
1. Did you find the leads from the Xantrex connection ki long enough for
the third inverter?
2. How many AC sources did you connect?
3. Did you provide bypass capabilities?
4. How did you interlock the bypass capabilities?
5. Did you use one or two Power Distribution Panels?
6. Can you offer any advice on how best to connect this equipment?
Thanks in advance.
William Miller
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