[RE-wrenches] Enphase consumption data

[Jason Szumlanski]

It is my understanding that you cannot have the consumption CTs enabled
without the production CT enabled. When the solar is connected on the load
side of the consumption CTs as it is in this case, the production CTs are
required to make the math work. It cannot use the microinverter readings
for the purposes of negating the production from the consumption because
the microinverter readings are simply averages of power production over
time, not instantaneous/concurrent readings.

Let me know if you find a workaround because I run into this scenario and
we just decline to install consumption monitoring altogether.


Jason Szumlanski
Principal Solar Designer | Florida Solar Design Group
NABCEP Certified Solar Professional (PVIP)
Florida State Certified Solar Contractor CVC56956


On Tue, Dec 20, 2022 at 4:18 PM Dave Tedeyan via RE-wrenches <
re-wrenches at lists.re-wrenches.org> wrote:

> Hi All,
>
> I have a system where the solar panels (with Enphase IQ8) are on a
> detached garage and the IQ gateway is in the house. The gateway is in the
> house so that it can gather consumption data, and there is an internet
> connection there. There are other loads in the garage, so it is impossible
> to get a production CT to the gateway that will register only the solar
> production. When I go through the commissioning in the installer toolkit, I
> can verify that the consumption CT's are installed and working properly.
> I've been having a tough time getting consumption and production data to
> display correctly in Enlighten because the production meter is not enabled.
>
> After many calls to tech support we finally have it set up that the
> production meter is enabled, but Enlighten is displaying the measurements
> from the microinverters. Then when the solar is backfeeding, the CT's
> register a negative value (as it should) and flags an error message. I have
> finally been able to get Enphase to just make that message go away. The
> last piece of the puzzle, which I do not know yet is: Does anyone know
> whether the consumption data will properly take into account the production
> data from the microinverters, or will it try to use the production data
> from the production CT which is now enabled, even though Enlighten displays
> the microinverter production data.
>
> I hope that all made sense. I am surprised that this is such an issue with
> Enlighten, so was just wondering if others have had better experiences when
> there is consumption CT's but no production CT's.
>
> Cheers,
> Dave
>
> --
> [image: Logo] <https://www.sungineersolar.com/>
> Dave Tedeyan, P.E.
> Owner | Sungineer Solar
> p: he | him | his
> a: 1653 Slaterville Rd. | Ithaca, NY 14850
> w: www.sungineersolar.com <http://www.sungineersolar.com/>
> c: (607) 288-2898
> _______________________________________________
>
>
>
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