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I think the AC coupled approach would be the best. For the 10KW
system, a pair of Sunny Islands fed by Sunny Boys would make an efficient
system. Since there is no generator, the system should be fairly
straight forward. <br><br>
At 02:06 AM 3/2/2012, you wrote:<br><br>
<blockquote type=cite class=cite cite=""><font face="arial" size=4>i
think mark was asking more about ac coupling to get away from the
horrible inefficiencies of battery based, grid-tied inverters.<br><br>
<br><br>
as an experiment, i have been thinking about ac coupling one (or more) of
my arrays on my outback system to gain 10% over having the gvfx do the
selling.<br><br>
<br><br>
stc to ptc usually costs about 20%, then losing another 10% in the
inverter is a real performance hit. i advise customers about phantom
loads and conservation, when actually the battery based inverter is
itself the big lump under the carpet!<br><br>
<br><br>
todd<br><br>
<br><br>
<br><br>
<br><br>
<br><br>
<br><br>
On Thursday, March 1, 2012 7:07pm, "Maverick Brown [Maverick
Solar]" <maverick@mavericksolar.com> said:<br><br>
My two cents:<br>
"battery-based inverter w/ PV on the DC side via charge
controllers"<br>
Simply replace the GT inverter with a Xantrex 600V Charge Controller plus
the 48V Grid Interactive Inverter of your choice and added battery bank,
etc.<br>
Until the market is saturated with unneeded GT Inverters, you will be ok.
;-)<br>
Try your best to provide enough battery for at least 24 hours of outage
at 50% DOD. You may have add a Sub-Panel or Manual Transfer Switch.<br>
Thanks<br>
Maverick<br>
Maverick Brown<br>
BSEET, NABCEP Certified Solar PV Installer ® # 091209-26<br>
President & CEO<br>
<b>Maverick Solar Enterprises, Inc.<br>
</b>Billing: PO BOX 1229, Dripping Springs, TX 78620<br>
Office: 512-919-4493<br>
Fax:
512-607-6398<br>
Cell:
512-460-9825<br>
Corporate:
<a href="http://www.mavericksolarenterprises.com/">
http://www.mavericksolarenterprises.com</a><br><br>
<hr>
<b>From:</b> re-wrenches-bounces@lists.re-wrenches.org
[<a href="mailto:re-wrenches-bounces@lists.re-wrenches.org" eudora="autourl">
mailto:re-wrenches-bounces@lists.re-wrenches.org</a>] <b>On Behalf Of
</b>toddcory@finestplanet.com<br>
<b>Sent:</b> Thursday, March 01, 2012 5:46 PM<br>
<b>To:</b> RE-wrenches<br>
<b>Cc:</b> 'RE-wrenches'<br>
<b>Subject:</b> Re: [RE-wrenches] Grid-Tied, PV by AC or DC<br><br>
excellent question mark... and one which has been on my mind as well,
being most of my work is bbgt.<br><br>
<br><br>
todd<br><br>
<br><br>
<br><br>
<br><br>
On Thursday, March 1, 2012 11:37am, "Mark Frye"
<markf@berkeleysolar.com> said:<br><br>
Folks,<br><br>
I have a residential grid-tied customer in a net metered utility with a
favorable TOU rate.<br><br>
They could use about 10 kW of PV to offset 100% of their usage.<br><br>
But, they also complain about regular power outages in their neigborhood.
They don't want a generator.<br><br>
With reliable AC coupling now available, do we yet know which is the more
advantagous architecture; grid-tied, battery-based inverter w/ PV on the
DC side via charge controllers, or grid-tied, battery-based inverter w/
PV AC coupled via grid-tied, utility-based inverter?<br><br>
Your thoughts? <br><br>
Mark Frye <br>
Berkeley Solar Electric Systems <br>
303 Redbud Way <br>
Nevada City, CA 95959 <br>
(530) 401-8024 <br>
<a href="http://www.berkeleysolar.com">www.berkeleysolar.com</a>
<br><br>
<br><br>
Sent from Finest Planet WebMail.<br>
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