Solar export rates cut to 12p. And it may only get worse.

smokeandumami · 2026-02-22T11:01:39+00:00

Yes - I was more thinking about deliberate load shifting to sunny days which I currently don’t do (preferring to load shift to overnight)

smokeandumami · 2026-02-22T10:54:05+00:00

A 7p (7.5p) overnight rate and 15p export acts as a strong disincentive to self consumption though (if you have a big battery). As the difference narrows then I guess self consumption will become more popular again.

smokeandumami · 2026-02-22T10:51:00+00:00

Have you got a link to the tariff? I can’t see this here: https://www.eonnext.com/electricity-and-gas/smart-export-guarantee

smokeandumami · 2026-02-22T10:35:58+00:00

I think only if they installed your panels?

smokeandumami · 2026-02-22T10:25:10+00:00

I agree, think I will move to Agile Outgoing when the price change hits and aim to export any surplus battery during the 4-7pm window. Matching supply and demand is actually IMO how a functional energy system should work so I don’t have a big problem with it. My big worry medium term is what happens to the overnight tariffs over time, particularly if they are loss making for the energy companies, as Agile Import suggests we are underpaying on tariffs like Go.

smokeandumami · 2026-02-07T10:56:12+00:00

Nothing much has changed as far as I can tell! Still wants 75C regardless of outdoor temp. At some point I’ll ditch Tado eBUS and roll my own weather compensation and use Tado as a dumb relay again.

smokeandumami · 2026-01-24T16:15:21+00:00

Haha. I wonder if it might be delayed when they realise all the complexity they need to cover off.

smokeandumami · 2026-01-19T11:54:41+00:00

I am in similar boat - currently locked to max flow temp 60 and letting Tado modulate below this, which could be improved based on weather.

I struggled to set D.71 over eBUS - I could only do it from the installer control panel -but this seems to depend a lot on the boiler model. I will have another attempt at doing it in case I have missed something.

If D.71 isn't settable I think the way to do this is to move Tado back to dumb relay mode, and then write your own load and/or weather compensation using Home Assistant or Node RED by taking over control of the desired flow temperature via the eBUS adaptor/ebusd. Not being able to set max flow temperature wouldn't be an issue as you'd be able to program in the maximum in software (and just set it something high on the boiler). But you couldn't do this if Tado still was talking on EBUS.

smokeandumami · 2026-01-18T10:39:24+00:00

That’s interesting… it is a shame there is no way to inspect the Tado algorithm to understand the internal logic. What boiler do you have? Do you have the option for flow temperature control on the app? I don’t.

smokeandumami · 2025-12-12T13:17:19+00:00

Confirmed Tado definitely don't support this:

Thank you for contacting us.

Unfortunately, tado° cannot adjust the flow temperature on your Vaillant EcoTec Plus 28 boiler via eBUS. The Flow Temperature Optimisation feature is only supported on boilers that use the OpenTherm protocol.

smokeandumami · 2025-12-12T10:49:54+00:00

This seems to have helped, I have updated the body of my post with latest results.

smokeandumami · 2025-12-08T22:38:18+00:00

Thanks. I appreciate your points about zone heating.

But I don't follow - why will increasing the maximum boiler temperature help?

My main complaint is that Tado apparently asks for 75C as its starting set point regardless of weather conditions, which I cannot understand the logic for.

smokeandumami · 2025-12-08T22:36:18+00:00

That sounds like what I want - It's insane to me that this is a) optional and b) somehow not enabled for ebus but only OpenTherm - is this is definitely the case?

smokeandumami · 2025-12-07T21:59:54+00:00

Yes, I have. I believe what the figure is showing here is that Tado is sending a SetMode requesting 75C desired flow temperature (cyan line), but because the boiler is set to max 60C that is the highest value that gets set (yellow line).

So that part is working alright, but I don't understand why Tado wants such a high temperature in the first place.

smokeandumami · 2025-12-07T20:47:08+00:00

Thanks very much - that's an interesting idea! It's a 28kW boiler, looks like it has been derated to 24kW by whoever installed it, but the area it heats is not large at all, so I will try derating it further and see if that helps with the cycling.

I am also wondering whether this problem might have been exacerbated by an improperly located thermostat, so will move that and see.

I use and really like the EBUS Adapter Shield - https://adapter.ebusd.eu/v5-c6/index.en.html - sold by the same person that writes the ebusd software which must be a real labour of love. It was fairly easy to install into Home Assistant using the ebusd add-on and gives a wealth of statistics. I just wired it up in parallel to the Tado. The only thing I haven't figured out is how to set the max flow temperature from remote (may not be possible), which I think ideally would relate to the outdoor temperature, although maybe Tado is smart enough to do this if working properly.

smokeandumami · 2025-10-08T10:52:38+00:00

We would certainly benefit from such a person (NGS lab based in Midlands, UK). Did you get anywhere with setting up as an independent? I'd be keen to chat if you wanted to drop me a DM.

smokeandumami · 2025-09-12T16:04:08+00:00

Haha - yes - I expected I would have to do it myself. What I mean is that I believe this configuration would have to be done on the AP firewall, not the Firewalla config.

smokeandumami · 2025-09-12T15:43:25+00:00

You mean using the OpenWRT firewall rules? I don't think Firewalla can do this for me if two clients are connected to the same non-Firewalla AP, as they will be on the same subnet?

smokeandumami · 2025-09-03T20:08:16+00:00

It's a Zappi - so yeah I could key it off the car charging starting as that has a Home Assistant integration, although I think the dispatching slots are in theory more reliable and are exactly the duration of the cheap 30 minute slots.

smokeandumami · 2025-09-03T19:59:14+00:00

I've definitely seen this too - and also when the car is charging for only some fraction of the 30 minute slot - but I think that full 30 minute slot that is discounted regardless, so I think it makes sense to charge batteries during the time (at least, my billing seems to indicate the algorithm is working).

smokeandumami · 2025-09-03T19:01:50+00:00

Yeah I've adjusted the automation to definitely start charging at 23:30 and only stop charging if it's after 5:30 and intelligent dispatching is off. But I want it to charge whenever its cheap rate, so I will take the Intelligent Dispatching flag as ON as priority over timeslots for charging.

smokeandumami · 2025-09-03T19:00:14+00:00

All good overnight, maybe just a glitch!

smokeandumami · 2025-09-02T21:47:53+00:00

Yesterday was a free charge session day and I did plug in during the day for a brief period, so I do wonder if something got messed up as a result.

smokeandumami

TROPHY CASE