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

[Jason Szumlanski]

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> 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
> w: www.solarenergy.org
> p: 802-272-3092
>
> NABCEP Certified PV Installation Professional
> # 093006-34
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>
>
> On Tue, Mar 30, 2021 at 9:24 PM greg egan <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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