Looks like my Powerwall 2 may have had an update overnight, but suddenly when demand exceeds solar output, power is being taken from the grid. No settings changed since yesterday (Been working reliably for years now), wondered if anyone else was seeing this behaviour? Bug maybe? Works fine if I switch to self-powered mode. Running v26.34.1

My first savings mode poor decision yesterday,

A nice charge up during the early afternoon window to about 70%, but come drawing power around 5pm it seemed to trigger it to panic and start importing during the expensive window (4-7pm) and then pinned itself at 100% for the rest of the evening

Generally it's been pretty good with charging in the 4-7am cheap window to a reasonable level to carry us through unit solar generation.

I think I will be converting back to fixed automations

I noticed that my home was consuming 5-6kW this afternoon. Finding no obvious cause, and knowing my EV was unplugged, I eventually found the culprit was my Powerwall. It was being charged from the mains. Normally it does this overnight at the off-peak electricity rate. My whole experience has been totally dependable until today. I didn’t change anything. The Powerwall remains in savings mode. Storm watch is off. The utility rate plan is Intelligent Octopus Go 12M Fixed.

The only recent change was a switch from Intelligent Octopus Go to Intelligent Octopus Go 12M Fixed. Interestingly, the Tesla app picked up the tariff change entirely on its own.

Could it be that the Octopus interfaces with the Powerwall to charge it when it suits Octopus, at an off peak rate, in the same way that it controls EV charging? I would not expect this but can think of no other reason for the Powerwall to be charging during peak rate times.

I've used foldables as my daily phone for a couple of years now (an OPPO Find N5 right now, with an iPhone Duo on the way), and the thing that always bugged me was opening a Powerwall app on that big inner screen and getting a stretched phone layout. The release of the iPhone Duo finally had me plucking this one off my backlog to work on. I spent this past week or so doing some learning, trial and error, a lot of testing, and finally publishing the apps for Duo and Android foldables.

Regulars here probably already know I'm the developer of SolDial for Powerwall, a third party app for Powerwall and Tesla solar. I've posted about it here before, and I've gotten such helpful feedback and feature requests from my user base. This one was a no brainer - since foldables are right now more popular than ever.

The idea was simple, I wanted the unfolded device to keep the "dial" on the left while all other tabs' info lived scrollable on the right. That's how I built it, and its working really well! It's a nice improvement to the app whether using it for a minute to checkup or doing some automation work where you might be spending a few minutes in there. Having the dial alive while you work feels nice.

A few details for anyone with a foldable:

• On the iPhone Duo the cover screen gets its own layout too, with the tabs in a bar along the edge where iOS keeps its own controls.
• On Android (Galaxy Z Fold, Pixel Fold, OnePlus Open, OPPO Find N) it splits on the crease Android reports for your phone, and Today's Solar Pace sits under the dial.
• Fold or unfold mid scroll and you stay where you were. This was a no compromise thing. Otherwise things got really confusing.
• Regular phones don't change at all.

Tesla also started rolling out a two column layout for tablets and foldables last week, which is good news for all of us. This one is built around the fold itself, with the live flow always on one side.

It's on the App Store and Google Play, and the live dial is free. More info and screenshots here: soldial.com/blog/powerwall-app-iphone-duo-foldables.html

If you have a foldable, what would you want on that second half?

Hi,

Has anyone had experience of your powerwall 3 dropping to 0% battery percentage then back up again? The other week we had it drop to 0% (and stopped generating solar) for about 24hours, then it went back to normal.

Today I noticed it dropped out for about 30mins. Has anyone else experienced this at all?

Since firmware version 26.26.11, my calibration cycle consists of simply charging to 100%, then calibration ends. No power is dumped to the grid. I have had two calibration cycles on this firmware version, and they both did the same thing.

Previously, the batteries dumped to the grid and discharged completely down to 0%, then charged to 100%.

Does everyone on 26.26.11 see this behavior, or am I "special". This is a big improvement over the previous behavior, so I hope it does not revert on the next firmware upgrade.

I got my PW3 + expansion pack in April this year. I don’t understand these charts. How can the 1yr figures be higher than lifetime?

Ho un impianto monofase 230 V in Italia, con Powerwall 3 e Backup Gateway 2, tutta casa sotto backup.

Il generale nel BG2 toglie alimentazione alla casa; quello nel quadro interno isola il solo quadro. Quest’ultimo è attualmente un Eaton FAZ6-C40/2, magnetotermico puro. I circuiti a valle hanno magnetotermici differenziali, prevalentemente da 30 mA.

Nel rilievo dell’impianto compare anche un differenziale da 300 mA dentro il BG2, ma devo confermarne l’esatta posizione elettrica e quale linea protegga.

Sto valutando il passaggio dei generali da C40 a C63, previa verifica di cavi e componenti.

Chi ha una configurazione simile: nel quadro di casa avete un generale solo magnetotermico oppure magnetotermico differenziale? Dove si trova la protezione differenziale del collegamento BG2 → quadro, e come resta efficace durante il backup?

Sarebbero utili codici degli apparecchi e uno schema dei collegamenti, soprattutto per installazioni italiane.

Just noticed this on the Netzero October update and thought it worth flagging for anyone with a larger solar array. We have 16kWp east / west split which peaks at about 13kW on good days so would be affected.

Hi everyone, I own a single Powerwall 3 with an 11.25 kWp solar array in Italy, installed in May 2025. Current firmware: 26.26.11-pc 0d5e28c6.

My main concern is the changeover to backup during a grid outage. On 8 October 2026, at about 20:50 local time, I experienced roughly 1-3 seconds without power before the house was supplied in backup. That duration is my observation, not a measured transfer time. The five-minute energy data show about 65% battery SOC and roughly 1.1 kW household load around the event; they cannot capture brief load spikes or the interruption itself.

Diagnostic snapshots from 11, 23 and 24 October contain PCH.SeamlessBackup.Enable = 0 under grid_code_overrides, with grid profile 50Hz_230V_1_SMC_CEI021_2024_Italy. I do not know what this internal setting means for my installation or whether it explains the delay. I have not changed it.

I also saw PWS_a083_AfciSvmTriggered in the 23 October snapshots, but it is absent from the latest snapshot on 24 October. BMS_a023_SW_Assertion is still present. NetZero reports diagnostic_alerts = []. I am looking for an interpretation of these entries, not assuming that their names prove a fault.

A separate behaviour I documented in September: PV output sometimes dropped as battery charging finished at a displayed 100% SOC. On 12 September, from 11:50 to 12:00, PV went from 8.208 to 6.624 kW while battery charging went from 4.344 kW to zero. I do not know whether this is related to the backup issue.

I have already contacted Tesla support and sent a technical update with diagnostic exports on 23 October.

Has anyone with a similar Italian/European setup had this backup delay investigated? Is this expected for the Italian grid profile, or is there an approved configuration/firmware fix?

If any Tesla Energy engineers or experienced installers are reading, which logs or measurements would help distinguish a regional setting from an installation or firmware issue?

Thanks for any specific experience or technical guidance.

About two months ago I posted a question here asking about what to expect from my two Powerwall 2s that had degraded capacity by more than 30%. I reached out to Tesla Support to have them look into it. They had me enable service mode and said that a tech would look into the issue in the next couple of weeks. Fast forward to the end of September, I got an email saying that there was an issue with my Powerwalls and that they were scheduling an onsite service visit.

I wasn't sure what to expect since they didn't really elaborate beyond saying there was an "issue", but lo and behold a couple of pallets from Tesla showed up in my driveway a few days ago, and today a couple of techs came and installed two brand new Powerwall 3s. Pretty pleased with the warranty service. Communication could have been a little better, but very happy to get two brand new batteries, not to mention having the full capacity again.

UK based. Anyone know what triggers PW’s to change their max charge grid import from 7.7kw to 10kw or vice versa in my case?

I have a PW3 + 3 expansions installed June this year, and from day one it charged at 10kw from the grid. It was unexpected as I thought it would be no more than 7.7kw, but then I read some update meant others were also seeing 10kw.

Great for the bonus IOG charging slots that would also top the battery.

Then on Sep 22nd it suddenly wouldn’t charge higher than 7.7kw, meaning it can’t quite fully charge to capacity overnight in off peak. Screenshots attached show 21st and 22nd with the abrupt change in 24hrs.

The grid mains does have headroom on my 100A fuse. I get voltage sag at very high draws at my house that occurs overnight off-peak with battery, EV, house load etc. Hence you see 9.5kw charge and 7.3kw charge.

Site import limit is set to none. I can’t see anything in settings showing any form of restriction (JSON file via NetZero).

Any thoughts on what might of happened or how I fix it?

We have a Powerwall 3 and expansion pack, initially installed single phase with whole home backup but moved to a 3P connection about 6 months ago. Had our first blackout recently and lost everything except for about 3 down lights and our hot water.

Emailed the installer and was told this is a load balancing issue which I understand, though I would think it would make more sense to have the fridge, internet and other main outlet circuits backed up? Is there a standard practice when considering which circuits are on the backup phase?

Twice now the robots that control the PW infrastructure have performed calibrations that result in my PW2s "resting" during the peak usage window. They are supposed to be 100% battery during that time. I get charged an arm and a leg for KWs during the window.

The PWs have been programmed to honor that window for 3 years, and they have ... until the dang routine calibrations have started firing every month.

Anyone know how to prevent the calibration from blowing through this window? It causes me to get a surcharge for the last 2 months.

Not a whole lot to report, breakers are in, and I received the disconnect switch (used off ebay). Problem though, the disconnect is missing the neutral bonding piece, which my one line calls out (didn't pay attention to the pictures, relied on part number alone, d'oh).

I have got that ordered now, but dang, it is pricey to just get this installed. Looking at about $3k in labor. Does that sound right, the powerwalls are already in place and ready, just need to hang disconnect and gateway and wire it up. I think the expertise here is the connect to the meter, which is fair enough.

I thought I was going to get it done this weekend, but still shopping around a bit.

I'm buying a new Pulte home in California with a Sunrun solar + battery system (~$40,300, purchased, not leased). Pulte selected Sunrun for the development, so I didn't choose the installer.

Section C(c) of Sunrun's Standard Plus Purchase Warranty says Sunrun may "administer and operate the System (including its battery(ies))… for demand response or other utility-based programs" and may "use the energy stored in the battery(ies) to reduce strain on the electrical grid."

I told Sunrun I don't want to grant this authority. They said the warranty language can't be changed, and that I should sign it and then opt out separately. Pulte's position is that it's Sunrun's contract.

For those who've bought Sunrun or other purchased systems:

- Did your purchase warranty include language like this?

- Did anyone get it removed or amended in writing?

- Is opt-out the industry norm for customer-owned batteries, or have you seen opt-in?

I'm not against VPPs and might join one later. I just think the owner should opt in, not have to opt out.

Full write-up here if anyone wants the details: https://medium.com/@goratna/california-new-home-buyers-beware-how-pulte-homes-and-sunrun-drain-the-rights-out-of-your-40-000-f0b5a2c0799f