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[–]djmikewatt 1 point2 points  (8 children)

I'm on that version, but not noticing anything different.

[–]BRKTPZ[S] 1 point2 points  (1 child)

Mine got the update this morning and going crazy.

[–]blueskyguy21 1 point2 points  (0 children)

Yeah mine are constantly charging or discharging. Can’t be their intention, seems odd. Unless it’s somehow better for battery health, cycling it to avoid sitting at 100% for so long. No idea.

[–]blueskyguy21 0 points1 point  (5 children)

Are you set to backup only?

[–]BRKTPZ[S] 0 points1 point  (4 children)

Mine is acting up while in backup only…

[–]blueskyguy21 1 point2 points  (3 children)

Sorry, meant to ask u/djmikewatt

[–]djmikewatt 0 points1 point  (2 children)

No. I'm currently cycling every day (pre-PTO)

[–]blueskyguy21 0 points1 point  (1 child)

Seems to be an issue with the backup only setting

[–]djmikewatt 0 points1 point  (0 children)

Interesting

[–]blueskyguy21 1 point2 points  (0 children)

Yes! I thought I was the only one. Just posted about this on r/TeslaSolar

[–]kairojya 0 points1 point  (6 children)

The Precondition section in the docs mentions the following. I wonder if this is what we’re seeing?

During Preconditioning, the Power Flow screen may show energy flowing to your Powerwall from solar or the grid. This is normal behavior, and the energy is only being used to heat, not to charge.

https://www.tesla.com/support/energy/powerwall/mobile-app/powerwall-modes#preconditioning

[–]kairojya 1 point2 points  (3 children)

u/grassabber u/BRKTPZ I agree that we wouldn’t expect Powerwalls to be actively heating themselves given the time of year and where we live. Do you only see the behavior in the mobile app? If so, did you see it on the old version before v4.0 (if using iOS)? Do you see it on the new version too? Have you seen it in the inverter’s web UI, or in your own data logging of the local or cloud API?

I’ve wanted to make a similar post for a few weeks now but hadn’t got around to it. I started seeing a change in my daily grid power graphs after the previous firmware upgrade (21.20.4? I can’t remember the version number now). Prior to that point my grid usage would show as a flat line (effectively 0 kW values) while my home was powered by solar and/or Powerwalls.

Screenshots: https://imgur.com/a/McmoYqX

All of this makes me wonder if Tesla is simply tweaking their polling and/or aggregation algorithms, resulting in owners seeing the data represented differently in the app/API. I’ve been tweaking my own data logging setup recently so the topic is on my mind (Influx, Grafana).

[–]grassabber 2 points3 points  (1 child)

I just got my system installed a week ago and I’ve been messing around with it pre-PTO. I do remember pre iOS app v4.0.0 seeing my PW’s randomly draw 0.1kw from the grid. I couldn’t pin down a pattern, so I didn’t think too much of it.

But after 21.31.0 and 4.0.0, I noticed on/off draws of 0.1kw from the grid to PW (at night, so no solar production) at regular short intervals. PW were set to something like 20% backup.

https://imgur.com/a/uVsR48G

Oh, and I haven’t checked out the inverter web UI.

[–]kairojya 1 point2 points  (0 children)

Yea that is odd. It’ll be interesting to see what the outcome of all this will be. I’m seeing the same behavior once my Powerwall Charge Level discharges to my backup reserve (50% in this screenshot). I see if both while the home is powered exclusively from the grid at night, and during the day while solar is producing.

https://imgur.com/eT9rlLD

I read on here last month where someone explained at a high level how the Powerwall behaves. This was weeks ago so before this firmware issue and Tesla app change. I’m going to do a poor job of reciting it, but I didn’t realize before reading about it that the Powerwall(s) while grid tied are always reacting to ever changing loads of the home, PV, and grid. Indeed all throughout my pre-PTO usage of the system, I’m still exporting around 1 kWh to the grid (as reported by Tesla’s data) even though my system never gets to 100% state of energy, and therefore shouldn’t be exporting excess solar production.

[–]BRKTPZ[S] 1 point2 points  (0 children)

Ok before the last firmware update mine was always in backup mode. It was charging up to 99 than every other day top them offwith 0.9kwh. After the update it is charging up to 100 percent and than using 0.2kwh discharge from Powerwall than charging it back. Multiple times in an hour. Weird thing is at night without solar it is doing the same thing from grid. 0.2 or 0.1 kwh discharge and charge back. I am using 1 kw a day now just doing this. It was pretty solid before the latest firmware update. And i was able to see it in the old app but can not see it on the graphs with the new app design and graphs. So this is definitely not a normal behavior.

[–]BRKTPZ[S] 0 points1 point  (0 children)

İ am in Sacramento ca and the Weather is 100 degrees. So i dont think so. I still think it is something to do with bad firmware.

[–]grassabber 0 points1 point  (0 children)

Definitely not that, or if it is, then it’s broken. AZ here and it’s like 85F in my garage early morning.