Xantrex versus Sunny Boy [RE-wrenches]

[Jeff Clearwater]

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Hi John and all,

As to Sunny Boy vs. the PVxx208 series.  Until you get up past the 50 
KW range (and maybe even quite a bit higher), I think it's SB all the 
way.  The isolation transformer losses and reliability issues and DC 
wiring and modularity win it all the way for me despite the labor. 
Exactly what point one switches from SB to PV as you go up I'm not 
sure yet.  I recently speced a 55 KW job and a 180 KW job and it was 
clear to me on the 55 KW job that I would still go with SBs.  But 
past that I'd have to seriously consider the Xantrex again but even 
then I could see using SBs even in the 100 KW or higher range.  An 
SMA employee (I won't hold him to it or mention names) did 
acknowledge that perhaps the 569 SBs totalling 1.5MW was a bit much 
but it does show you what you can do!

What are other designers thinking about how big a SB inverter bank 
gets before it's time to go with a bigger inverter?

Cheers,

Jeff

And one slight correction:  That's Insulated (not integrated) Gate 
Bipolar Transistor - IGBT.  Actually IGBTs have some advantages over 
MOSFET's like switching speeds and  less on-state resistance. And 
John's right - no dumb questions - that's what the list is for - to 
educate all of us.  I've learned alot on this list.

>It stands for "integrated gate bipolar transistor' - basically the
>fore-runner before MOSFET technology.  Once MOSFET's hit the scene, it
>pretty well took over most, if not all, applications.     And no question is
>a dumb question.
>
>                                         cheers,                John V
>
>------------------------------------------------------------------------------
>
>"Todd Cory, Mt. Shasta Energy Services" wrote:
>
>>  Maybe this is a dumb question but what is "IGBT technology"?
>>
>>  Todd
>>
>>  > The IGBT technology and electronics used  has very high losses at less
>>  > than full load.
>>
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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

877-SOLARVillage
413-256-6777,  Fax 413-825-0372
61 Baker Rd
Shutesbury, MA 01072

PO Box 115
Boonville, CA 95415
707-895-9015, Fax 707-897-0024
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