Solar setup fails, will not complete, even though solar production is detected

Thank you Justin.

Before installing solar CTs, I had perfect readings from my setup.

I haven’t touched the usage CTs, however, since support enabled my solar readings, I’m seeing numbers that do not make sense at all.

Since that was done, my readings in Sens AND the Tesla app have gone wild.

I have a 2 powerwall system with a powerwall 2 gateway.

I don’t know what to tell you, but it’s insane.

These are the readings currently for each system, while my solar system reads 12,723 watts production:

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I’m at a loss here.

The solar CTs are attached to the solar wires that go into the powerwall gateway.

Should I change that?

Thank you,

I would hold off until you hear back from Support, since they have access to your monitor and will be able to advise you accordingly. If you don’t hear back with a satisfactory response, let me know so I can check in on your ticket.

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Thank you so much.

I’ll give them a couple of days, and reach out if they don’t come back to me.

I also replied with the exact same reply I sent you to the support team.

Thank you again man.

So, doing the math, my solar readings are correct.

If I subtract the solar from the usage, it gives me the real usage.
Solar plus usage

Is that how it’s supposed to be?

In a typically set up Sense solar install, subtracting the Solar Production (3,964) from the Total Usage (house load - 10,836) will give you the Net Usage seen by a net meter at the interface to the grid. Batteries will complicate things since a battery is both a load and an energy source.

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I agree, the batteries are creating the issue here.

All I want from Sense, the reason I got it, is:

  1. To know the house usage (regardless if it’s powered by grid, solar or batteries) and eventually know which device is using how much

  2. Know my solar production at all times in real time

So basically, I would like to remove the powerwall from the equation from Sense.

Based on what you said, then my usage should be reading 6,972 w instead of 10,836 w, or am I misreading the whole thing?

Thanks a lot for the help.

I hesitate to make a call on what your numbers mean for two reasons. I can’s see exactly what’s hooked up where, plus the Sense setup and calibration can adjust to 2 or 3 different scenarios. To be clear about my basic solar setup:

  • One pair of CTs monitor the mains as they enter my house (they meter net usage)
  • One pair of CTs monitor the solar backfeed where the inverter is connected to my main panel
  • In that setup Sense adds my Solar Production coming from the inverter into the main panel to the Net Usage coming from the mains, to show Total Usage for the house.

The challenge for you with this mode of Sense operation, is that you want to monitor your solar, but your Total Usage is Solar Production plus Battery Output plus Net Usage. In my mind, you need to treat the battery as part of the house load, and just focus on Solar Production and Total Usage, though you might have situations where Total Usage goes to zero because the battery is supplying the full house load.

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Thanks man. Here’s what I found so far:

Solar is measuring correctly. No problem there.

Now, the usage CTs are the ones accounting for the actual home useage plus the solar production. This happens because the solar injection is in the same contacts of the load/backup inside my gateway 2.

I don’t know if Sense is capable of determining this eventually, just like it picks up the devices. If it can, it will even out by itself (maybe someone from Sense can confirm/deny this hypothesis?), if not, then I will need to invest in a panelboard for my gateway, and setup the solar injection over it.

Everyone, thank you so much. I really appreciate all the effort to help me and the patience.

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So, as it turns out, I didn’t have to move any of my CTs from where they were.

Support took care of it and now it’s all reading as it should.

Solar is not adding/subtracting anymore, and the usage is spot on.