net metered system w/generator [RE-wrenches]

[David Blittersdorf]

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Kirk,

NRG's new building has 29 Sunnyboys (65kw)connected in a net 
metered configuration along with a 50kw Kohler backup generator.

All the PV feeds to a meterpak on the grid side of the ATS (Automatic 
Transfer Switch). The ATS has 3 connections; Grid, LOAD and 
Generator. It is a double throw switch with the load as common. You 
are either on Grid or on Generator. When the Grid fails, all the Load 
switches to the Generator automatically as the generator fires up. 
The PV is still tied to the Grid and since the grid is dead, all the 
Sunnyboys shut down.

This arrangement also allows us a way to sell all the PV power to our 
utility when it hits a summer peak on a hot summer day. We just take 
our company off grid (run on the generator) and sell power at the 
market rate.

Simply connect all the PV to the grid side of the ATS.

David Blittersdorf

On 18 Apr 2004 at 14:42, Kirk Herander wrote:
> Group,
> 
> I'm desighing a system with 10 kw peak of pv and multiple Sunnyboys. The
> owner has an existing 30 kw Kohler generator w/ ATS that transfers the main
> panel to generator during a power failure. What's the best way to disconnect the
> backfed Sunnyboy circuits from the panel during a power failure? I don't want
> the Sunnyboys to think generator power is the grid and refuse to disconnect as a
> result, attempting to put solar AC into the panel & generator. There are easy
> contactor / relay senarios of course, but do any of you have a preferred method?
> or is the Sunnyboy smart enough to limit output if the power cannot be
> "absorbed" anywhere?
> 
> thanks for your help, Kirk
> 
> Vermont Solar Engineering
> Kirk Herander
> North American Board of Certified Energy Practitioners
> Certified Solar PV Installer(TM)
> Xantrex Certified Dealer Charter Member
> NYSERDA-eligible installer
> Vermont Solar and Wind Partner
> 
> PO Box 697
> Burlington, VT. 05402
> www.vermontsolar.com
> www.backeastsolar.com
> 800.286.1252 - 802.863.1202
> fax 802.863.7908
David Blittersdorf
NRG Systems, Inc.
110 Commerce Street
Hinesburg, VT 05461 USA
Tel: 802-482-2255
Fax: 802-482-2272
email: davidb at nrgsystems.com
Web:http://www.nrgsystems.com

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