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[Solved] Offline electric heating automation using the G12W tariff

hindoos 567 7
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Treść została przetłumaczona polish » english Zobacz oryginalną wersję tematu
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  • #1 20889243
    hindoos
    Level 35  
    Hi all :)
    I would like to build a simple automation to control the heating with electric radiators, 2kW each (3 radiators).
    In addition to the typical daily schedule, ie.
    23:00 - 05:00 not less than 18 degrees
    05:00 - 07:00 not less than 20 degrees
    07:00 - 16:00 not less than 18 degrees
    16:00 - 23:00 not less than 20 degrees
    I would like to use cheap energy in the G12W tariff to additionally heat the flat in the cheap electricity zone (14:00 - 15:00 and 05:00 - 06:00), but so as not to exceed 22 degrees

    The whole thing should work offline, online access is an optional benefit.

    I have some Sonoff POW relays left over from an old unrealized project but I don't know if they will be suitable for my applications, because if I have seen correctly, they work with the Sonoff cloud and are controlled by the eWeLink app?
    If so, the heaters themselves also have a manual thermostat.

    Any ideas on which home automation system would be easiest to base this on?

    Greetings!
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  • #2 20889265
    Adam-T
    Level 41  
    hindoos wrote:
    Any ideas on which home automation system would be easiest to base this on?

    Depends on what you find easiest ;)
    One suggestion could be e.g. a Sonoff Basic R2 (wifi) with preloaded tasmot and attached DS18B20 temperature sensor.
    You program via a browser on the wifi home network. The relay contacts in it (the sonoff) are not too strong, so it is enough that it controls a contactor and this will switch the power supply to the radiators.
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  • #3 20889272
    Ryszard49
    Level 38  
    Take a look at this:
    Link

    The E4040Smart controller only works on a 2.4 GHz WiFi network, but this is not a problem.
    I use the controllers but without the WiFi option and they work perfectly well, allowing rational management of electricity, which is not insignificant these days.
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  • #4 20889277
    hindoos
    Level 35  
    @Ryszard49 but I see correctly that it only controls one device? Can further receivers be added?
  • #5 20889289
    Ryszard49
    Level 38  
    I have 1 controller set up for 1 room. In 3 rooms 1 radiator in 1, 2 radiators controlled from 1 controller. The controller with Wi-Fi option allows you to set the heating parameters in the rooms in real time. Unfortunately I have not had the opportunity to try out this system. It would be good if someone using this solution or similar would comment on this.
    Controller operation:
    Link
    Just a note, You have 2kW radiators and the relay output is 5A, so you need to use another relay with a higher load capacity. In my case I did on SSRs.
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  • #6 20891038
    hindoos
    Level 35  
    Only unfortunately at my place there are 2 rooms and 3 radiators :/ and on top of that this limitation, in this respect the Sonoff with 3500W Pmax should have a power reserve for continuous operation keeping a small form factor and not requiring an additional power supply from the plug, like the Eurostar receiver.

    A pity, because I had a Eurostar controller for my cooker and it worked faultlessly for several years - until I scrapped the cooker it served and sold the working controller on.

    So the Sonoff remains but maybe stay with the eWeLink and integrate it with the Home Assistant?
  • #7 20900275
    pm18
    Level 15  
    >>20889243
    Hello
    I am involved in building automation. >>20889243 >>20889243 >>20889243 >>20889243 Hello
    I am involved in building automation.

    Added after 18 [minutes]:

    >>20889243
    Hello
    I am involved in building automation.
    I can write a program and give you a hint on what to do - but that's in a private message , so as not to litter here.
  • #8 21488949
    hindoos
    Level 35  
    I finally let the subject go and am installing a gas cooker. Electricity costs are going up so it's not a very cost-effective solution.
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Topic summary

The discussion focuses on creating an offline automation system for controlling three 2kW electric radiators using the G12W tariff with specific temperature schedules and additional heating during cheap electricity periods without exceeding 22°C. The user considers using leftover Sonoff POW relays but is concerned about their reliance on the eWeLink cloud and manual thermostats on the heaters. Suggestions include using Sonoff Basic R2 devices flashed with Tasmota firmware combined with DS18B20 temperature sensors to enable local control via Wi-Fi, controlling higher loads through external contactors or SSRs due to relay current limitations. The E4040Smart controller is also mentioned as a Wi-Fi 2.4 GHz device capable of managing heating rationally, though it typically controls one device per controller, requiring multiple units for multiple radiators. The Sonoff devices with a 3500W maximum power rating offer a compact solution without needing additional power supplies, unlike Eurostar controllers previously used for other appliances. Integration with Home Assistant is proposed to enhance control beyond the native eWeLink app. A building automation expert offers to provide programming assistance privately to avoid cluttering the discussion.
Summary generated by the language model.
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