array expansion strategery [RE-wrenches]

[Matt Tritt]

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Andy,

By all means, go with a direct grid-tied system! You will get 
approximately 10% better efficiency over the SW, have no maintenance 
besides cleaning the modules, no batteries to sit there and go bad doing 
nothing and you can install the inverter right at the array. Much more 
sensible in my view.

Matt T

Andy Cochrane wrote:

>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
>
> 
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>
>
>  
>


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