[RE-wrenches] 3 Xantrex XW system

[William Miller]

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:
>Content-class: urn:content-classes:message
>Content-Type: multipart/alternative;
>         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.
>mark.edmunds at xantrex.com
>
>From: re-wrenches-bounces at lists.re-wrenches.org 
>[mailto:re-wrenches-bounces at lists.re-wrenches.org] 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: re-wrenches-bounces at lists.re-wrenches.org 
>[<mailto:re-wrenches-bounces at lists.re-wrenches.org>mailto:re-wrenches-bounces at lists.re-wrenches.org] 
>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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Please note new e-mail address and domain:

William Miller
Miller Solar
Voice :805-438-5600     Fax: 805-438-4607
email: william at millersolar.com
http://millersolar.com
License No. C-10-773985
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