[RE-wrenches] Interconnection with Generator

[Daniel Young]

We also go to the utility side as a rule. 

We have only one exception. A 60kW Solectria inverter is tied into a
building system that is supported by a 1 MW generator. It's a university
heating plant where it was clearly shown the base load was far larger than
the 60kw solar PV system, even when the plant was at "idle". The facility
had a building management system with historical 15min usage data to support
this.

Unless you have hard data that your solar inverter will never ever meet the
buildings real-time demand, tie into the grid side. This is best practice to
the best of my knowledge.

With Regards,

Daniel Young, 
NABCEP Certified PV Installation ProfessionalTM: Cert #031508-90
NABCEP Certified Solar Heating InstallerTM: Cert #SH031409-13
 

-----Original Message-----
From: RE-wrenches [mailto:re-wrenches-bounces at lists.re-wrenches.org] On
Behalf Of Aaron Mandelkorn
Sent: Tuesday, October 28, 2014 11:20 AM
To: RE-wrenches
Subject: Re: [RE-wrenches] Interconnection with Generator

I always connect to the utility side of the transfer switch. Since the
transfer switch is a listed electrical enclosure it is the best option I
have used. 

Aaron

Aaron Mandelkorn
Owner/Solar Specialist
Renewable Energy Outfitters
719-221-5249
970-596-3744
www.reosolar.com
reosolar at gmail.com


> On Oct 28, 2014, at 8:48 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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