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"Production Current" is non-zero amps at night...huh? #196

Open jimmyz80 opened 1 month ago

jimmyz80 commented 1 month ago

I'm trying to make sense of what the "Production Current" sensor is trying to tell me, but it's not adding up. I'm hoping someone can confirm if this is an issue, or if I'm misunderstanding things. My understanding is that Production Current will be the number of amps flowing through my Enphase combiner's production CT on its way to my main panel. Ie. how many total amps I'm currently outputting from my solar inverters.

During the day this seems to hold true. If I have a day that peaks at 11.6kW output, then diving that by 240V gets me within 1A or so of the value reported by Production Current L1 or L2. But once the sun goes down my output predictably goes to 0W, but Production Current hangs out at about 4A on both L1 and L2. I would have expected this to also go to 0A or slightly negative to indicate some standby consumption by the inverters.

Please see the attached image, and thanks in advance for any wisdom you can share. :)

Screenshot 2024-05-09 at 9 45 08 AM
catsmanac commented 1 month ago

No real wisdom to share, aside from expecting it be be zero. Have no CT so can't verify it for you. As the minimum value seems consistend one would think it's some zero-offset.

To check if there's no issue reported on the CT you can download the Envoy diagnostic report in HA. Open it and look for a line starting with:

"Endpoint-meters":

In that line look for:

\"meteringStatus\": \"normal\",\n        \"statusFlags\": []

There's up to 8 occurrences in the line depending on how many phases are configured. First set of up to 4 for the production CT sand it's phases, second set for the consumption CT.

If all is ok you should see normal metering status and no status flags. Other meter status can be not-metering or check-wiring, Status flags shown can be production-imbalance, negative-production, power-on-unused-phase, negative-total-consumption. I'd expect some error on the Envoy if these show though.