Mark:
I think I have this problem licked. See last drawing on
http://millersolar.com/practices/Technical_Procedures/xw/3XW.html We will
be using two outboard load centers for utility and generator feeds to the
inverters. This leaves the on-board AC rail open for my new, full feature
bypass assembly. We will need a custom slide plate which we can machine
out of aluminum, or, do you think Xantrex might want to go into production
with this?
As you recall, you and I discussed the fact that the utility is hesitant to
allow the use of an XW system with a generator component. After several
iterations, they finally accepted our design package for processing. I
hope it passes review.
I'd like to talk with you about this. I will call you. I am posting to
the Wrenches in case others are curious about this solution, or, maybe they
can discover a flaw in the design and save me from myself.
Thanks,
William Miller
PS: Thanks also for being very helpful to me on a number of occasions. I
think you are a real asset to Xantrex.
Wm
At 03:30 PM 4/29/2009, you wrote:
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boundary="----_=_NextPart_001_01C9C91A.134EC7D7"
Hi William, Brian
There was a change made to the XW Distribution Panel to accommodate nine
2-pole breakers for 3 inverter installations, as the original version was
with 8 slots only. Unfortunately the original 8 breaker capacity version
is still working its way through the inventory in the field so we do
have a kit with the new front panel we can provide to use with 3 unit systems.
Please contact me off list if you want to set that up.
Cheers,
Mark
Mark Edmunds, P.Eng
Director New Product Development
Xantrex Technology Inc.
[email protected]
From: [email protected]
[mailto:[email protected]] On Behalf Of William Miller
Sent: Tuesday, April 28, 2009 11:43 PM
To: RE-wrenches
Subject: Re: [RE-wrenches] 3 Xantrex XW system
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>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]>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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