Design Challenge (Was Sunny Island Experience?) [RE-wrenches]

[Jay Peltz, Peltz Power]

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HI Jeff,

No I'm talking full off grid.
The system works pretty much the same way as the sunny island.

You hook up the ( for example ) sonny boy into the output leads of  
the VFX off grid version.  The power from the SB will go either to  
the loads and/or battery charge by running the VFX backwards.

The reason for changing the setpoints on the SB's is big motor starts  
might drop the "grid voltage" below its connect point and so it will  
drop off line.  But you can get them modified with, wider voltage and  
hz windows, reduced time off line to make the system work much better.

The SB's will go off line if the VFX's shut down, no ac to sink to.   
So the only concern is that the batteries are all full.  So you want  
to turn off the SBs.  Best way is with  a solid state relay, between  
the output of the SB and the connection to the VFX/power center.  It  
shuts off when the batteries are too full, thats it.

jay


On Feb 4, 2006, at 9:07 PM, Jeff Clearwater wrote:

> Hey Jay,
>
> Thanks for that,  However you said grid-tied version - did you mean  
> the SB or in a grid-tied system?.  This is off-grid.  No utility on  
> the other side of that isolation relay!.  Still work?
>
> Thanks again!
>
> Jeff
>
>
>
>>
>> Hi Jeff,
>>
>> I have talked to J. Berdner at SMA, and Chris F. at Outback  and  
>> there is no problem with using the Sunny Boy into the Outbacks.   
>> Should work with any grid tie version, but the folks at SMA can  
>> work with you to tweek some of the settings so the line tie  
>> inverters don't trip off line unnecessarily.
>> ( I've looked into this for a similar project)
>>
>> The only problem would occur if the batteries were full and there  
>> was nowhere for the power to go.
>> To get around this use some solid state relays, controlled via the  
>> VFX's to shut off the SB's if the battereis get too full.
>>
>> Given that you are now at 500v from the array, better to move the  
>> inverters to where you want them.
>>
>> Good luck,
>>
>> jay
>>
>> peltz power
>>
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>
>
> -- 
> ~~~~~~~~~~~~~
> Jeff Clearwater
> Village Power Design Associates
> Sustainable Energy & Water Solutions for Home & Village
> http://www.villagepower.com
> gosolar at villagepower.com
>
> 530-470-9166
> 877-SOLARVillage
> 877-765-2784
> 425 Nimrod St.
> Nevada City, CA 95959
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~`~
>

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