[RE-wrenches] How large is too large?

[Darryl Thayer]

Of course, but perhaps it is a generator system with solar assist. Do you have a kWh/day estimate?  When you size and price kWh cost of the generator running with they will come to their senses.  Use Homer (NREL) to give a basis for energy costing, they have suggested numbers for generator-battery-solar operating costs.
Darryl  


--- On Mon, 3/2/09, Wind-sun.com <windsun at wind-sun.com> wrote:

> From: Wind-sun.com <windsun at wind-sun.com>
> Subject: Re: [RE-wrenches] How large is too large?
> To: "RE-wrenches" <re-wrenches at lists.re-wrenches.org>
> Date: Monday, March 2, 2009, 12:48 PM
> Most likely they will get sticker shock when they see the
> price, happens to us a lot. Once that happens you can
> suggest a more reasonable system, perhaps grid interactive
> with battery backup that is a lot smaller.
> 
> We have done a couple of similar size systems in Mexico,
> but they had to grid power within 20 miles or so.
> 
> ..................................................................................................
> Northern Arizona Wind & Sun - Electricity From The Sun
> Since 1979
> Solar Discussion Forum: http://www.wind-sun.com/ForumVB/
> ..................................................................................................
>   ----- Original Message ----- 
>   From: William Miller 
>   To: RE-wrenches 
>   Sent: Monday, March 02, 2009 11:12 AM
>   Subject: Re: [RE-wrenches] How large is too large?
> 
> 
>   Mark:
> 
>   I suggest you do not exceed three battery strings, if
> possible.
> 
>   William Miller
> 
> 
>   At 09:58 AM 3/2/2009, you wrote:
> 
>     Hello Wrenches, 
>     I have a customer that has really likes the thought of
> being off-grid and they have asked me to design a system for
> their "lodge".  I have kicked and screamed to get
> them to consider a grid-tied system using their existing
> grid service­to no avail.  
>     After doing a preliminary load analysis, I have
> determined that it would take ~35kW of solar and a couple
> Bergey Excels for it to work along with a 19,000Ah battery
> bank.  
>     So, how big is too big?  If we were to move forward on
> this, what would be the major obstacles/show stoppers
> besides the price (as price is not an issue)?
>     What are some of the largest battery based systems that
> you have installed or heard of?
>     Any input is welcome. . .besides being told just to run
> away from this one. . .
>      
>     REgards, 
>      
>     Mark Dickson
>     Oasis Montana Inc.
>     www.oasismontana.com
> 
> 
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