[RE-wrenches] Interconnection with Generator

Jarmo.Venalainen at schneider-electric.com Jarmo.Venalainen at schneider-electric.com
Tue Oct 28 16:35:00 PDT 2014


Hi:

Xantrex did some early work on generator with inverter compatibility back 
in 2007.  AC coupling PV to generators was very new back then and we 
wanted to find the benefit of using a battery based inverter to reduce the 
run time of generators.  One system was a small 5kW off-grid house and the 
second a 90kW generator running a couple of dozen homes.  For the trial is 
set up with power monitoring for back-feed and much more.

The systems are still running.  Here are a few training slides which 
summarize the results and a link to the archived study from 2007 at the 
Natural Resources Canada.



http://www.nrcan.gc.ca/energy/publications/sciences-technology/renewable/solar-photovoltaic/6215

The bullet form summary is:

- The smaller the generator, the large the savings whether you grid tie to 
the generator or use a battery based inverter to reduce generator run 
time. 
- PV is not needed to get the bulk of the savings in systems using battery 
based inverters to reduce run time of small generators.

JARMO


On Oct 28, 2014 4:48 AM, "Corey Shalanski" <cshalanski at joule-energy.com> 
wrote:
Wrenches,

We frequently encounter residences with backup generators. The question 
that arises: how should the PV system be interconnected?

I have searched the archives and found some good information about this 
subject, but nothing definitive. I have fallen into the habit of broadly 
proclaiming that the PV system *must* be interconnected on the "utility" 
side of the transfer switch - in order to prevent backfeeding into the 
generator and thereby eliminate unintentional equipment damage. Is this 
concern justified? If so, should this be an absolute rule or would it 
depend on the generator make/model?

Thanks for any insights.

--
Corey Shalanski
Joule Energy
New Orleans, LA

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_____________________________________________________________________________________ 


Jarmo Venalainen  |   Schneider Electric   |  Solar Business  |   CANADA | 
  Training & Development Specialist - Senior 
Phone: +604-422-2528  |   Fax: +604-420-1591  |   Mobile: +604-505-0291 
Email: jarmo.venalainen at schneider-electric.com  |   Site: www.SEsolar.com 
|   Address: 3700 Gilmore Way, Burnaby, BC V5G4M1 


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