[RE-wrenches] "Keep that there PV off my grid!"

[Karl Jaeger]

Dana,

This is an instant excess situation, not one electron.

I am not sure if this violates federal regulations, but you make a valid point. I will have to look into it.

Honestly, there is a very small probability that any PV will ever make it to the grid. The service is 1000 Amps and the building has multiple servers running continuously, all day every day. I am hoping to forego the dumpload option and the added costs. Word is, they will begin discussions in the coming months addressing this issue. In the case that they decide to allow it, it would be an easy fix to remove the contactor and splice the conductors.

I have heard rumors that a contactor like I described does in fact exist. But that was some years ago and I cannot remember the details.

Thanks,

Karl Jaeger
Operations Manager
LightWave Solar Electric
www.lightwavesolar.com<http://www.lightwavesolar.com>



From: re-wrenches-bounces at lists.re-wrenches.org [mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of Dana
Sent: Tuesday, February 15, 2011 4:31 PM
To: 'RE-wrenches'
Subject: Re: [RE-wrenches] "Keep that there PV off my grid!"

Karl –

Is this instant excess or excess during a specific billing period?
Does this violate Federal regulations?
Could you divert or bank the excess in process heat, water pumping, or some other function?

Dana Orzel
Great Solar Works, Inc
E - dana at solarwork.com<mailto:dana at solarwork.com>
V - 970.626.5253
F - 970.626.4140
C - 970.209.4076
web - www.solarwork.com<http://www.solarwork.com>

"Responsible Technologies for Responsible People since 1988"
Do not ever believe anything, but seriously trust through action.

From: re-wrenches-bounces at lists.re-wrenches.org [mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of Karl Jaeger
Sent: Tuesday, February 15, 2011 3:21 PM
To: re-wrenches at lists.re-wrenches.org
Subject: [RE-wrenches] "Keep that there PV off my grid!"

Greetings Esteemed Wrenches,

My company was recently tasked to engineer a PV project in Alabama. We sat down for a meeting with all of the local big-shots. They proceeded to let us know that we are not allowed to feed any excess PV power onto their grid, production cannot exceed demand. I am hoping that y’all might be able to steer me towards a contactor assembly or device that would detect reverse current flow, trigger the contactor, then open up the inverter AC output circuit. The service is 3-phase, 208 volt. The maximum current we intend to introduce is 70 amps, continuous.

Appreciate your advice,

Karl Jaeger
Operations Manager
LightWave Solar Electric
www.lightwavesolar.com<http://www.lightwavesolar.com>

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