where to to tie in? [RE-wrenches]

[David Blittersdorf]

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We just installed 72 kw of PV on our new building. We have 32 kw on 15 
Zomeworks trackers and 40kw on the roof and window awning. Total of 32 
Sunnyboy 2500 inverters on single phase, 208 vac. Our building is 208, 3 
phase at 200 amps. All the inverters feed 2 separate breakers at a four 
meter MeterPack at the utility meter location. Wiring on the AC side was 
easy as it is 3 phase, 208 vac. We have a 45kw propane automatic backup 
generator that can run our whole building during a normal work day. It is 
connected so it takes over the building and the PV is on the grid side.

I am sold on a distributed inverter design and since start up last June we 
have had not a single failure. I love the high voltage string inverter design. A 
single inverter is scary to me.

David Blittersdorf

On 4 Mar 2005 at 18:04, Marco Mangelsdorf wrote:
> 
> I'm working on a proposal for a 80 kW array and am trying to determine the
> appropriate spot for the utility tie-in.  The best spot appears to be the
> 800A main service disco.  The rating of the panel where the 800A breaker is
> 1200A.  So, the max input amperage from the PV system can be 400 so as not to
> overload the busbar.  My question: where to tie in with my, say, 75 kW Ballard
> output at this 800A disco/1200A panel?  Two choices, right? A hot tap on the
> line side of the breaker/busbar or on the load side of said breaker.  Any
> suggestions or directions to appropriate sections of the NEC? Finally, any of
> youse guys and gals have any experience with the 75 kW Ballard inverter good,
> bad or ugly?
> 
> aloha,
> marco
> 
> Marco Mangelsdorf
> President
> ProVision Technologies, Inc.
> 69 Railroad Avenue, A-7
> Hilo, Hawai'i 96720
> (808) 969-3281, 934-7462 facsimile
> www.provisiontechnologies.com
> 
David Blittersdorf
NRG Systems, Inc.
110 Riggs Road
Hinesburg, VT 05461 USA
Tel: 802-482-2255
email: davidb at nrgsystems.com
Web:http://www.nrgsystems.com

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