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

[toddcory at finestplanet.com]

i think mark was asking more about ac coupling to get away from the horrible inefficiencies of battery based, grid-tied inverters.
 
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.
 
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!
 
todd
 
 
 
 
 
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
 
 
 
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.


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