Jason, etal
Another Schneider/Xantrex option to consider.
Xantrex will be adding the MPPT 80 to their product line (orderable this
month). This new charge controller will allow high voltage strings
(600V, as opposed to 150V for current CC). It will also integrate into
the existing 4024 inverters via the XAN-Bus for charge control.
Regards,
Gary Willett, PE
Icarus Engineering / Solar Services LLC
NABCEP Certified Solar PV Installer # 031310-246
On 5/3/2011 9:15 AM, Jason Szumlanski wrote:
Interesting. It's only "off-grid" when the grid goes down, which is
presumably not often in this case. I think the actual Enphase position
is that this "may void warranty." In practice, I doubt they would a)
ask, b) know, and c) actually disallow a warranty claim unless there
is system-wide damage that can be directly attributed to the off-grid
setup.
But to be safe I would advise the customer of this issue and make a
case for using the Xantrex GT or another brand that does not make the
same exception.
Thanks for the info!
Jason
*From:*re-wrenches-boun...@lists.re-wrenches.org
[mailto:re-wrenches-boun...@lists.re-wrenches.org] *On Behalf Of *Mark
Frye
*Sent:* Tuesday, May 03, 2011 9:32 AM
*To:* 'RE-wrenches'
*Subject:* Re: [RE-wrenches] AC Coupling Xantrex XW Inverters
toEnphaseMicroinverters
Jason,
My guess is that this will work just fine.
My comment is that according to my conversations with Enphase, they
would consider this an "off-grid" application for which they do not
warranty their product.
If this is the case, it is something your customer should understand
upfront.
Mark Frye
Berkeley Solar Electric Systems
303 Redbud Way
Nevada City, CA 95959
(530) 401-8024
www.berkeleysolar.com <http://www.berkeleysolar.com/>
------------------------------------------------------------------------
*From:*re-wrenches-boun...@lists.re-wrenches.org
[mailto:re-wrenches-boun...@lists.re-wrenches.org] *On Behalf Of
*Jason Szumlanski
*Sent:* Tuesday, May 03, 2011 6:18 AM
*To:* RE-wrenches
*Subject:* [RE-wrenches] AC Coupling Xantrex XW Inverters to
EnphaseMicroinverters
I read the application note here:
http://www.global-download.schneider-electric.com/852577A4005D7372/all/8FA29D94B918A0FB8525781F0072FCA7/$File/ac-coupling-app-note(976-0240-01-01_rev-a).pdf
<http://www.global-download.schneider-electric.com/852577A4005D7372/all/8FA29D94B918A0FB8525781F0072FCA7/$File/ac-coupling-app-note%28976-0240-01-01_rev-a%29.pdf>
...and I contacted Xantrex to make sure the application note applies
to other brands of grid-tie inverters. It does according to the rep I
spoke with.
I just wanted to find out if there is any real world experience out
there with Enphase and the XW series AC coupled. I have a customer
with three XW4024's in single phase configuration set up as a battery
backup only now. He wants to add up to 10kW. I suggested Enphase as an
AC coupled system (mainly due to the distance to the proposed array).
I'm aware of the pitfalls noted in the application note regarding high
limit shutoffs. Any thoughts?
Jason Szumlanski
Fafco Solar
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