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

[Corey Shalanski]

Hello Greg,

As Will mentioned, this mode of operation is doable with SolarEdge, but it
will require some additional hardware—specifically, you will need an energy
meter as well as CTs for each power phase.

Here is some documentation to get you started:
- Export Limitation brochure
<https://d1c96hlcey6qkb.cloudfront.net/de1543db-d336-4a89-9a35-dfb08ac7a6c6/316c59969efe4bcd8d98ed461864612c?response-content-disposition=inline%3B%20filename%2A%3DUTF-8%27%27Export%2520Limitation_Residential%2520flyer_ROW.20200727133751107.pdf&response-content-type=application%2Fpdf&Expires=1617321600&Signature=LYeT1QuE0gbaDBl11Khs82CHcxAQ6AwH3ShnOUPy4Mn9wZU2yfp58AV2u5CnXw-Msd39gaIVaeVhLY553LgmA-3OjoLBgnr7D6srKYZXRwxXlN8y24OVc~28jmheitiU~IFgcsxJNyfEFmdueDCzcH1kgN-bXCXD-FDwO5Fr6weysBqw3~6cK0~1A00WUTuwBuQoAbtzWYXhXbrtNf1kYPAYHXI-T10Bc8uvXcapCmUagkNJSjuJW7OSCPUEKtZdV0x1gkKaaocJU3TaQViIKY6Bwrw0qIqo4uBoNyT-rF5Mu-So3Pf4d8fDterfQa2OKHbqIX6RJIzOIBVmRT1-JQ__&Key-Pair-Id=APKAI33AGAEAYCXFBDTA>
- Energy Meter webpage
<https://www.solaredge.com/us/products/metering-and-sensors/solaredge-residential-electricity-meter>
- Export Limitation application note
<https://d1c96hlcey6qkb.cloudfront.net/de1543db-d336-4a89-9a35-dfb08ac7a6c6/f0f8ba991b974f37bba1112cce845f09?response-content-disposition=inline%3B%20filename%2A%3DUTF-8%27%27Export%2520Limitation%2520v2.5.20201123105127969.pdf&response-content-type=application%2Fpdf&Expires=1617321600&Signature=Zo3EK-tZ~Zp60hmFWhY-i-6NrpRbAjGXRop5bHutXj8M9EYJgZHIBz2Abtv0H1Rutq9cYv0wkHPwygMMOHgs1kTd-RvDxcrjJ-WVISIStN~HrK6JGKoD3x6pBoNZ7at9PtTn0j4mpiyJ-BtzRRZZNKT1dufsmLxErAa8NUseb89WtmAjaGQIF2ffX6J2QmxcISz4kBzsMS8kZw4Vr-fpDshzgOznzElEInr8CLB5lYmT5Emu2Et~JL47fjLVMCEE3TupX4WTQaJpoU9tr2gQU8YZC6m~dJtbhLouGpkOYb5WiO-BiQbLvjFNk-2uyn3I-ZjLlPjc87xox4krsMs6sQ__&Key-Pair-Id=APKAI33AGAEAYCXFBDTA>

You'll note that SolarEdge calls this feature "export limitation" as
opposed to simply "zero export." That is because the user can limit the
amount of power (e.g., 1 kW, 2 kW, etc.) that is exported - or none* at all.
*Related to Jason's point, please note the following information included
in the application note (page 24):
" “Zero export” term can be misleading at times as one may think that
export to the grid
is always avoided. In fact, “zero export” mode is expected to export some
energy to the
grid in some edge cases. The solar systems strives to produce as much power
as
possible for the site consumption, however, load change events constantly
occur. The
zero export-regulated system tries to match production-power and
load-consumption-power at all times. During the transition periods, some
export power is inevitable."

--
Corey Shalanski
Jah Light Solar
Portland, Jamaica


On Tue, Mar 30, 2021 at 5:24 PM <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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