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

[Jay]

I didn’t say it did. 3 options. The OEM are selling a product that isnt code complaint, doubtful. Or it is  included in the UL listing or there isn’t a UL standard for this to test to. 

I don’t have time but a call to the companies that list this feature would clear it up. 

Jay
Peltz power. 


> On Mar 31, 2021, at 10:56 AM, Jason Szumlanski <jason at floridasolardesigngroup.com> wrote:
> 
> 
> Does UL1741 cover zero sell? I wasn't aware of that. I thought it just covered anti-islanding. If zero sell is covered, I don't see why a utility would not accept that. 
> 
>> On Wed, Mar 31, 2021, 11:51 AM Jay <jay.peltz at gmail.com> wrote:
>> A number of companies have this feature which is under their UL listing. 
>> SE
>> SolArk
>> To name 2. 
>> 
>> Are you saying that the UL listing isn’t enough and that it needs 3rd party testing. 
>> If so what organization/testing would that be?
>> 
>> Jay
>> Peltz power
>> 
>>>> On Mar 31, 2021, at 8:27 AM, Jason Szumlanski <jason at floridasolardesigngroup.com> 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> 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
>>>> Do you envision a world powered by renewable energy? Be the change.
>>>> 
>>>> 
>>>>> 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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