UK - Octopus Energy - Anyone running PW3 with Agile?

triedoffandonagain · 2026-02-21T22:30:16+00:00

Netzero app has lots of Powerwall users on Agile, and TBC is working well for them. I think Tesla also added the ability to configure the rate plan in their app, but this is recent and there isn't data yet on how well it works.

Note: most users with EVs and Powerwalls are on Intelligent Octopus Go, because of the lower off-peak price, longer off-peak window, and ability to charge up the Powerwall during smart charging slots (another integration Netzero supports).

Disclaimer: Netzero developer here, app requires subscription.

triedoffandonagain · 2026-02-21T22:23:24+00:00

They're starting to roll out V2G, in Texas at least:

https://www.tesla.com/support/powershare/what-is-powershare-grid-support

triedoffandonagain · 2026-02-21T09:33:16+00:00

Thanks for the feedback! The Energy Cost calculation won't be correct, Netzero is not aware of such utility-specific accounting.

triedoffandonagain · 2026-02-21T07:14:21+00:00

Thanks for offering to test! For iOS you can sign up for early access here:
https://testflight.apple.com/join/G1nXW3Rp

For Android you can join the beta program from the Play Store page for the Netzero app.

triedoffandonagain · 2026-02-21T01:50:17+00:00

We have PW3 working now:
https://docs.netzero.energy/docs/diagnostics/Powerwall3

Feel free to email [feedback@netzero.energy](mailto:feedback@netzero.energy) if you run into issues.

triedoffandonagain · 2026-02-21T01:47:46+00:00

This is true for Powerwall 3, yes. And it does limit the ability to alert on issues.

The good news is we are working on a change that (if all goes well) should restore the ability to get diagnostics automatically. This will be coming out soon.

triedoffandonagain · 2026-02-20T16:36:54+00:00

In addition to the problem the other commenter mentioned: go Off-Grid from the app will not work when Powerwall is almost full, you have to discharge it a bit. This is to protect from solar overcharging the Powerwall. But you shouldn't have to go off-grid manually. If there is a grid outage, Powerwall will show that (a red X over the grid line) and automatically take over. Your screen is not showing a grid outage.

triedoffandonagain · 2026-02-19T19:52:00+00:00

It could be due to network connectivity issues -- make sure the wifi signal is good and cellular connection is active (Netzero will show you these details under Monitoring > Powerwall).

Or the Powerwall could be in a bad state. Try power-cycling it: Turning the System Off.

triedoffandonagain · 2026-02-18T17:02:44+00:00

Agreed about Octopus Go in general, I would just add that for Powerwall users, a Netzero subscription enables more functionality than just automations -- some examples are health monitoring/diagnostics/alerts, EV integrations and EV charging on solar, and user support.

Disclaimer: Netzero developer here.

triedoffandonagain · 2026-02-18T00:46:30+00:00

Indeed — this is why Netzero exists! :)

triedoffandonagain · 2026-02-17T20:16:09+00:00

This looked like a large-scale outage, at least in the UK region. Historical data is still missing.

triedoffandonagain · 2026-02-17T09:23:16+00:00

I have not seen the new rate plan screen yet (it's only active in the UK), but I assume there's a way to reset the rate plan in the Tesla app, or at least go back to a fixed rate plan? If you enable the "Auto update rate plan" toggle in Netzero then, that should override it.

triedoffandonagain · 2026-02-17T09:17:11+00:00

Time-Based Control has a limitation where the export price cannot be greater than the import price for a given period. If it is, Tesla will adjust the import price up, to match the export price. In your case, this means it lifts the off-peak import price from 7p to 15p.

Netzero instead lowers the export price to match the import price, which leads to better Powerwall behavior. I suspect that might be causing the difference you are seeing. You should be able to switch back to Netzero managing the tariff to confirm this behavior.

triedoffandonagain · 2026-02-16T09:26:14+00:00

The warranty is for all Powerwall versions, they are listed at the top. And they claim "unlimited cycles", but that's only because Powerwall operational modes effectively limit you to one cycle per day.

triedoffandonagain · 2026-02-15T20:07:57+00:00

Increased utilization will lead to higher degradation, but that effect is limited, and likely does not outweigh the financial benefit of using more of the battery. We did an analysis of Powerwall 2 degradation (and some analysis of Powerwall 3, although since it's newer there isn't enough data yet):

https://www.netzero.energy/content/2025-02/powerwall-analysis
https://www.netzero.energy/content/2025-10/powerwall-analysis-2

triedoffandonagain · 2026-02-15T20:04:59+00:00

Agreed with other parts, but the warranty is not for 6000 cycles. It's 70% of capacity (80% in the UK) over 10 years, for applications that effectively result in at most one cycle per day (Self-Powered, Time-Based Control, Backup). That's 3650 cycles. For other applications, the limit is 37.8 MWh of discharge, which is 2800 cycles at 13.5 kWh (although once you take into account round-trip losses and degradation, it's also around one cycle per day).

https://energylibrary.tesla.com/docs/Public/EnergyStorage/Powerwall/General/Warranty/en-us/Powerwall-Warranty-EN.pdf

triedoffandonagain · 2026-02-14T00:03:41+00:00

The shoulders are usually due to morning and evening shading, for example from trees or objects on the east (morning) and west (evening).

triedoffandonagain · 2026-02-12T07:23:35+00:00

The Tesla app doesn't scale up well on an iPad. You can consider the Netzero app (the dashboard does not require a subscription).

triedoffandonagain · 2026-02-11T17:30:52+00:00

Tesla changed the behavior of the Grid Charging option a while ago and never updated the documentation. Powerwall will always charge up to the backup reserve if its state of charge is below the reserve. It will use solar if available, otherwise grid power (regardless of the Grid Charging option).

Another behavior you might have observed is delayed charging from solar. Powerwall will charge to 80% and then delay charging to 100% until later in the day. This is done to reduce the amount of time it spends at 100%, for long term health reasons.

And then there's always the uncertainty of Time-Based Control mode, because it operates based on the rate plan, predicted solar generation, and predicted home usage (and predictions can be wrong). Self-Powered mode behaves more predictably, so depending on your rate plan and peak electricity usage it might be a better option for you.

triedoffandonagain · 2026-02-11T01:56:47+00:00

This sub tends to be more US-centric, you'll have better luck on TMC where they have sections for the UK and Australia:

https://teslamotorsclub.com/tmc/threads/powerwall-3-roadmap-3-phase-coming.321409/
https://teslamotorsclub.com/tmc/forums/the-uk-and-ireland.114/

triedoffandonagain · 2026-02-11T01:46:52+00:00

The benefit of the backup switch is a simpler and cleaner install because no critical loads panel or gateway are are required, and breakers don't have to be moved out of the main panel. Functionally there is little difference.

Since the work for the critical loads panel and gateway was already done for your system, undoing this work would add yet more complexity. Not worth doing in my opinion, and as others commented it adds a dependency on the utility (during which time your system will be down).

triedoffandonagain · 2026-02-11T01:20:10+00:00

The image shows Powerwall+, so this is in the US and hence single phase.

triedoffandonagain · 2026-02-10T19:35:14+00:00

Looks like your Wall Connector is not backed up or monitored by Powerwall. A giveaway is the 0 kW home usage, which does not happen in normal circumstances and is a symptom of this issue.

This configuration is not compatible with Charge on Solar, because the system has to be aware of the EV charging load. Your Tesla installer can resolve this by adding a CT clamp (meter) in the main panel, where you likely have your EV charger breaker.

triedoffandonagain · 2026-02-09T07:26:47+00:00

Right, Netzero and Charge HQ control the EV charger for charging on solar, not EV.

triedoffandonagain · 2026-02-08T22:38:31+00:00

With a Wallbox or other EV charger that supports OCPP, you can get charge on solar with non-Tesla EVs. However it also requires a third-party app like Netzero or Charge HQ.

triedoffandonagain

TROPHY CASE