array expansion strategery [RE-wrenches]

[Andy Cochrane]

Hi Wrenches,
 
My partner and I are having a discussion about the best way to fulfil an
existing customer's request for expansion.
 
The system we put in in Apr 2004 is currently:
2.2 KW on a tracker
Xantrex SW 4024 (grid-tied w/GTI), (2) C-40's, and Xantrex DC panel,
~900AH 24 V battery bank
 
The customer wants another 1.1 KW now and maybe yet another 1.1 KW next
year.  These arrays will be fixed mount to the deck railing, from which
access to the existing power equipment is not difficult.
 
The question is whether to use another charge controller (an MPPT model
this time) and add this array to the existing system, or whether to use
a small SunnyBoy grid-tied inverter separately intertied into the same
subpanel.
 
The main question is whether the efficiency losses by going thru the
SW/battery system (batteries never used) make it worth avoiding those
efficieny losses by using an efficient synchronous inverter, which would
be slightly more expensive.
 
Penny for your thoughts.
 

Andy Cochrane

Power Trip Energy Corp

2343 Thomas St

Port Townsend, WA 98368

(360) 643-3080

www.powertripenergy.com

 

 

[Non-text portions of this message have been removed]


- - - -
To send a message: RE-wrenches at topica.com

Archive of previous messages: http://lists.topica.com/lists/RE-wrenches/read

List rules & how to change your email address: www.mrsharkey.com/wrenches/etiquette.php

Check out participant bios: www.mrsharkey.com/wrenches/

Hosted by Home Power magazine

Moderator: michael.welch at homepower.com
--^----------------------------------------------------------------
This email was sent to: michael.welch at homepower.com

EASY UNSUBSCRIBE click here: http://topica.com/u/?bz8Qcs.bz9JC9.bWljaGFl
Or send an email to: RE-wrenches-unsubscribe at topica.com

For Topica's complete suite of email marketing solutions visit:
http://www.topica.com/?p=TEXFOOTER
--^----------------------------------------------------------------