[RE-wrenches] Grid-Tied, PV by AC or DC

[Drake]

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.

At 02:06 AM 3/2/2012, you wrote:

>i think mark was asking more about ac coupling 
>to get away from the horrible inefficiencies of 
>battery based, grid-tied inverters.
>
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>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.
>
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>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!
>
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>todd
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>On Thursday, March 1, 2012 7:07pm, "Maverick 
>Brown [Maverick Solar]" <maverick at mavericksolar.com> said:
>
>My two cents:
>"battery-based inverter w/ PV on the DC side via charge controllers"
>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.
>Until the market is saturated with unneeded GT Inverters, you will be ok. ;-)
>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.
>Thanks
>Maverick
>Maverick Brown
>BSEET, NABCEP Certified Solar PV Installer ® # 091209-26
>President & CEO
>Maverick Solar Enterprises, Inc.
>Billing:  PO BOX 1229, Dripping Springs, TX 78620
>Office:       512-919-4493
>Fax:           512-607-6398
>Cell:          512-460-9825
>Corporate: 
><http://www.mavericksolarenterprises.com/>http://www.mavericksolarenterprises.com
>
>
>----------
>From: re-wrenches-bounces at lists.re-wrenches.org 
>[mailto:re-wrenches-bounces at lists.re-wrenches.org] 
>On Behalf Of toddcory at finestplanet.com
>Sent: Thursday, March 01, 2012 5:46 PM
>To: RE-wrenches
>Cc: 'RE-wrenches'
>Subject: Re: [RE-wrenches] Grid-Tied, PV by AC or DC
>
>excellent question mark... and one which has 
>been on my mind as well, being most of my work is bbgt.
>
>
>
>todd
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>On Thursday, March 1, 2012 11:37am, "Mark Frye" 
><markf at berkeleysolar.com> said:
>
>Folks,
>
>I have a residential grid-tied customer in a net 
>metered utility with a favorable TOU rate.
>
>They could use about 10 kW of PV to offset 100% of their usage.
>
>But, they also complain about regular power 
>outages in their neigborhood. They don't want a generator.
>
>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?
>
>Your thoughts?
>
>Mark Frye
>Berkeley Solar Electric Systems
>303 Redbud Way
>Nevada City,  CA 95959
>(530) 401-8024
><http://www.berkeleysolar.com>www.berkeleysolar.com
>
>
>
>Sent from Finest Planet WebMail.
>
>
>
>Sent from Finest Planet WebMail.
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Drake Chamberlin
ATHENS ELECTRIC LLC
OH License 44810
CO license 3773
NABCEP Certified PV
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