Re: [RE-wrenches] Grid tie w/o battery no sell back

[Chris Mason]

I misunderstood the question the two options I listed are battery systems.
What I should have suggested as a solution was the Enphase microinverter
system with the Zero Export profile and Production CTs on the service to
the panel. That will do Zero Export so that all the power produced is self
consumed, there is virtually no exported power to the grid.

On Thu, Aug 29, 2019 at 9:16 AM Chris Mason 
wrote:

> Outback Radian or Pika.
>
> On Wed, Aug 28, 2019 at 9:41 PM Jay  wrote:
>
>> are there any products out there that can do a grid tie w/o batteries but
>> no sell back to the
>> grid?
>>
>> Thx
>> Jay
>>
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>
> --
> Chris Mason
> Solar systems designer
> Generac Generators Industrial technician
>
> Comet Systems Ltd DBA Comet Solar
> Anguilla Cell  264.235.5670
> WhatsApp 264.235.5670
> Skype: netconcepts
> www.cometsolar.com 
>


-- 
Chris Mason
Solar systems designer
Generac Generators Industrial technician

Comet Systems Ltd DBA Comet Solar
Anguilla Cell  264.235.5670
WhatsApp 264.235.5670
Skype: netconcepts
www.cometsolar.com 
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Re: [RE-wrenches] Grid tie w/o battery no sell back

[Jerry Shafer]

SMA Has the optional Power during a grid failure
Jerr

On Thu, Aug 29, 2019, 8:11 AM Jay  wrote:

> are there any products out there that can do a grid tie w/o batteries but
> no sell back to the
> grid?
>
> Thx
> Jay
>
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[RE-wrenches] Grid tie w/o battery no sell back

[jay]

Hi Wes and everyone else.

I’ve heard from Enphase and Fronius offsite and indeed its quite possible to do 
“self consumption”.  Both Enphase and Fronius need some additional hardware but 
thats to be expected and pretty minor really.
SMA and SE both are supposed to do it but I didn’t pursue exactly what they 
need to do it, but I’m presuming they also need additional hardware to read the 
main.  At this point nobody is reading the smart meter, but  that would be the 
easiest and most accurate.  Maybe when sunspec comes out it will be able to 
interface?

This whole question started from an old client up in SE alaska, who’s utility 
no longer accepts NEM.  He’s got a lot of sun during the summer and not much in 
the winter as well as lots of clouds, which to me means that a battery system 
isn’t going to do much.  
And given how inexpensive GTWOB is, vs adding batteries its an interesting 
option.  In his case I think the self consumption option is a good one.  

In other areas with different price structures it might be totally different. 
And I’m sure will  have an impact as to what size system might be the most 
economic.  The Fronius has a relay option that will turn loads on/off based on 
curtailment.  

As to load peaks, those of us off grid folks understand to do it when the sun 
shines and to me I think we will see more and more smart day time load use as 
we see more and more renewables come on line during the daytime.

Thanks again everyone,

jay





> On Aug 29, 2019, at 11:07 AM, wes kennedy  wrote:
> 
> HI Jay,
> 
> The Fronius line, primo or symo have that capability. You need the smart 
> meter to measure current flow at point of interconnection. 
> The tricky bit is what happens when a big load suddenly turns off. There will 
> always be a small flow of energy across the meter for a second or two while 
> the system reacts and curtails the pv array. 
> HECO was fine with this limited, momentary export of energy.
> These residential systems typically have very low performance factors, as the 
> PV peaks around noon, when a typical load profile peaks morning and evening. 
> So you end up curtailing most of your pv production. 
> In a commercial application though, zero export can work really well, if you 
> size PV to midday loads. 
> 
> -Wes Kennedy
> 
> 

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