[RE-wrenches] how to prevent selling to grid with grid tie inverter

[frenergy]

On the other hand, utilities /have/ accepted inverters to shut-off power 
production into the grid if the grid fails via, I assume, software 
and/or electro-mechanical means.

Bill

Feather River Solar Electric
Bill Battagin, Owner
4291 Nelson St.
Taylorsville, CA 95983
530.284.7849
CA Lic 874049
www.frenergy.net

On 3/31/2021 4:35 AM, Jason Szumlanski wrote:
> I wonder how quick these software based approaches are to respond to 
> loads that drop off and momentary selling that may occur before 
> production is curtailed. I think what Greg may be asking is whether 
> there is a failsafe method to prevent backfeed. Without a battery, I'm 
> not sure how that would be accomplished. It's an interesting question.
>
> I can see a small utility not accepting a non-failsafe software based 
> solution unless it can be shown to be 100% effective via third party 
> listing/certification.
>
> Jason Szumlanski
> Florida Solar Design Group
>
> On Wed, Mar 31, 2021, 7:29 AM Will White <will at solarenergy.org 
> <mailto:will at solarenergy.org>> wrote:
>
>     Many inverters have the option to zero-sell (no export to the
>     grid) but you need an additional CT on the main service conductors
>     so the inverter can monitor the loads and ramp down production if
>     it starts to get close to producing more than the loads require.
>
>     I'd suggest getting into the manuals and white papers of the
>     inverter manufacturers to determine if they can do this. I believe
>     both SolarEdge and Enphase can do it. I'd assume others can as well.
>
>     Thanks,
>     Will
>
>
>     -- 
>     *Will White*
>     Curriculum Developer
>
>
>     e: will at solarenergy.org <mailto:will at solarenergy.org>
>     w: www.solarenergy.org <http://www.solarenergy.org/>
>     p: 802-272-3092
>
>     NABCEP Certified PV Installation Professional
>     # 093006-34
>     Do you envision a world powered by renewable energy? Be the change
>     <http://solarenergy.org/donate>.
>
>
>     On Tue, Mar 30, 2021 at 9:24 PM greg egan <greg at remotepowerinc.com
>     <mailto:greg at remotepowerinc.com>> wrote:
>
>         Wrenches, I've got a small system using SolarEdge inverter (4
>         kW) that
>         is supposed to go in to a small town that does not allow
>         selling power
>         to the grid.  That may change but that is how it stands now.  The
>         customer wants to use the power that is generated but can not
>         sell or
>         even give excess power away.  Do any of you have any
>         experience setting
>         up a grid tie no battery system so that it can not sell to the
>         grid
>         under any circumstances?  Just wondering before I dig any
>         deeper if
>         there's an obvious solution I'm missing. Thanks,
>
>         Greg Egan
>         Remote Power Inc.
>
>
>


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