Luke1

Did you ever go through with and receive your referral bonus from EOn? I had nothing my end and they have requested account details of the account referred to check, I'll let them know it was the 19th December and see what happens. (Not clear if they wanted a name etc, but fully understand if you don't want to ping over to me)

I have the same controller, but have not used the HW smart control, which I think can only be used with solar connected to the system. I would guess that it heats the water when solar is at a peak. I'm not sure if its predictive for weather, and what happens in the case of no solar? I would probably schedule this to the cheap rate period over night. You may be better off doing it this way if you have solar export that is higher than overnight import rates? If you don't run out of hot water in the day, you could also look at tweaking the HW setpoint down to increase COP, likewise up if you do run out and it re-charges in the day when you don't want it to. (This can be accessed in the installer settings by holding the back arrow for 7 seconds from the home screen). In respect of the 24/7 heating, we tend to batch heat over night into the floor slab so that the heat pump doesn't run as much in the day during peak rate electricity. In the shoulder seasons we should be able to heat over night only. I do this by scheduling a temperature increase / curve increase for the overnight period. (Which one you see is dependant on whether you have an internal temp sensor connected to the unit.)

Thanks @joth Hopefully the £50 welcome credit will go some way to offsetting the 900% temporary price hike! I do somewhat miss the Octopus API and ease of using their online account, the E.On app is just simply not as good. The extended economy 7 hours are however a win win for me compared with the recent Octopus Agile prices. I have also read a bit about how the latest Tracker formula (for daily rates) is getting worse with each iteration. It makes me wonder if Octopus are trying to force people out of this tariff now and onto more traditional tariffs again.

For V4 it was a ‘requirement’ to have either an EV or battery storage. They have just updated to V5 which again states the requirement for an EV but excludes battery storage as they have a new tariff due shortly for that. You have to declare that you have an EV, but they do not check. I think some people had said they were looking into EV ownership and they were still accepted onto the tariff.

Having recently moved from Octopus to E.On for exactly the same reasons I only have good things to say so far. My smart meter had stopped communicating with the DCC just before transferring across. E.On booked an engineer to come in a week later who switched it out for a new one. A couple of days later the new readings were coming through onto their website. They agreed to back date the Next Drive tariff from the date I transferred over to them which was a nice surprise too, as I was expecting to pay at their variable tariff rate as per their T&C’s. If you haven’t already started the process, and would like a referral code for £50 off your bill (I would also receive £50) my link is https://share.eonnext.com/topaz-crane-1929

No extra accessories were required. I had to access the service menu by holding the back arrow for 7 seconds, and then selected permit cooling.

Will drop these guys a message. Hopefully they are interested in small domestic customers unlike most FCU companies!

I've come across the I-Life2 Slim 170 on Saturn Sales @ £589 inc. VAT and shipping. Seems they are a UK company and therefore no further customs charges to be paid... https://www.saturnsales.co.uk/I-Life2-Slim-DLMV-170-ATS2-Fan-Assisted-Radiator.html Has anyone found any ducted units in the UK? I have a loft space with suitable space in the eaves where a unit could be positioned and ducting installed. I can't however find any suitable units on the UK market that include drip trays and don't require a bulk order.

Are you saying there are no HP systems that can intergrate a WB or Aga into the control system?

You can do this with the NIbe SMO 20 controller. It has a standard temperature / curve setting. It has 3 separate schedules for increasing / decreasing the temperature / curve setting. It has a further 2 schedules for blocking the compressor from working at all.

In which case you can definitely set schedules. If you have a room stat connected to SMO 40 you'll be able to set the actual temperature for various periods. If you don't have a room thermostat you can offset the weather compensation curve for different time periods. See page 24 of the user manual https://www.nibe.eu/assets/documents/23958/231765-5.pdf I would highly recommend that you read the other posts on this forum and those at renewableheatinghub.co.uk to understand the importance of running these systems in weather compensation mode and only using your 'Emmetti' thermostat as a maximum temperature limit (which generally is set higher than your required temp ie 24C). Then you tune the weather compensation curve depending on how the house responds to the outside temeprature.

I think Nibe S2125 refers to the outdoor unit. What indoor unit do you have that controls your system? Could be an SMO 40 or 20? I have an SMO 20 and I use the scheduling to offset the heat curve at different times. (I increase it over night to make the most of cheap E7 electricity and then set it back during the day)

The batteries you linked are twice the price of Pylontech (when adjusted for capacity), but perhaps a small price to pay if they are significantly more likely to have a catastrophic failure. The photos are fairly concerning! I presume you need to complete the G99 Application if you grid tie that inverter? It seems a bit extreme for my requirements given that I'll probably be doing a grid tie system.

Thanks for the advice. Looks like they'll be outside on heated pads! I didn't appreciate that there was still a risk with the new LiFePO4 batteries, but as you say, there will still be a significant amount of energy being stored. Seeing as space won't be an issue for storing batteries in an outbuilding, is there better bang for your buck by getting an older design of battery?

Interesting, I think what you're describing makes sense. I should be able to insulate the shed portion fairly well to, so perhaps that will negate some of the winter losses. My plan is also to split my solar across the shed & log store at 35 degree slope and also a future pergola where I will either have them flat or perhaps tilted South slightly, but the gain doesn't seem huge by raising them 10 degrees or so, and I don't really want to see them poking up from the pergola. I've been looking at the voltacon website for budgeting purposes as it gives you customisable sizes and then I just need to account for the electrician, cable etc. https://voltaconsolar.com/solis-hybrid-5kw-pylontech-us2000-system.html Good Idea on the AC back to the house. I have a 50mm duct going in as we speak, so it's probably worth running 2 cables through it. One for the grid tied side and another with the backup power.