Manufactures on the list [RE-wrenches]

[Mark Edmunds]

Blair, Todd, Mark, Wrenches -

I missed some of this dialog as I haven't had time to check the list for
a couple days, my apologies. As a manufacturer we are here to help
answer your questions about our products, but do get pushed to get a
little carried away by our friendly competitors once in a while. As a
general rule we will always avoid commenting on the products made by
others, and leave that to you all.

Back to Mark's original question on the XW charge controller.
Theoretically I suppose the answer could be yes. Anything is possible.
If there was a VERY LOW impedance bond from the PV negative line to the
controller chassis ground the GF fuse could blow, thereby breaking the
fault path, and the controller may not give an indication of this.  But,
you would be hard pressed to make this occur in the real world.  The
level of impedance found in array ground systems to earth or the fact a
fault is more likely to occur somewhere within the array itself would
ensure that the controller would detect a fault like this.  And as I
have already pointed out, this hasn't been an issue in the high volume
pure grid tie world.  And again...this approach is UL compliant.    

Now, if you don't accept this and want to plan for any eventuality no
matter how remote, feel free to add an external PVGFP to our charge
controller.  This would be the same as Outback's higher cost approach to
GF detection.  We allow for this for 2 reasons;

1) customers in Europe want this for floating arrays
2) customers in the US requested this to tie into existing PV systems
with external ground fault breakers already installed  

You can download the instructions to disable the internal ground fault
detection here...
http://www.xantrex.com/web/id/252/p/docs/pt/23/product.asp 

Hope this helps.

Cheers,

Mark


Mark Edmunds
Director Engineering
Residential Renewable Energy Group
Xantrex Technology Inc.

-----Original Message-----
From: Blair May [mailto:tump at hughes.net] 
Sent: Tuesday, March 04, 2008 6:40 AM
To: RE-wrenches-topica. com
Subject: Re: Manufactures on the list [RE-wrenches]


This is very true! I too expect answers.  we as wrenches all to often
have to deal w/ vapor ware & lack of explanations from the manufactures.
Maybe after many complaints, the manus will address these complaints but
that's after we loose valuable time money & future clients. Xntrx what
about the answer to the question?

Sent via BlackBerry by AT&T



-----Original Message-----

From: "Todd Cory, Mt. Shasta Energy Services"
<toddcory at finestplanet.com>



Date: Tue, 04 Mar 2008 05:29:22 

To:RE-wrenches at topica.com

Subject: Re: Manufactures on the list [RE-wrenches]







Blair May wrote:



>Mark , Their value to us (the manufactures) here on the wrench list is

>quite high. Yes there are some manufactures that DO seem to pontificate

>w/out the chastising from Michael, while others offer their comments in

>a rather concise manner. Sounds like life in general. With that being

>said, I would like to say THANKS to ALL the reps that do take the time

>to watch the list & comment when they can. THANKS

>  


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