net metered system w/generator [RE-wrenches]

[Kirk Herander]

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>>>Simply connect all the PV to the grid side of the ATS.<<<<
Good idea & a simple solution.

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

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.


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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