Potential-free switchable socket for whirlpool - sensible?

  • Erstellt am 2021-06-08 11:27:19

hampshire

2021-06-08 11:27:19
  • #1
Hello everyone,
to save energy, I want to preferentially heat the whirlpool when the photovoltaic system is supplying power. This is no problem with a potential-free switchable socket, which I can control from my system. At the same time, I also want to prevent the temperature from dropping below 36 degrees if the photovoltaic system does not provide enough energy for an extended period. This could be done with a water temperature sensor that initiates a potential-free signal when the set temperature is undershot. The idea now is to use a socket with 2 potential-free switching contacts that supply power when either enough energy comes from the photovoltaic system or the water temperature falls below 36 degrees. Overheating is prevented by the built-in control of the whirlpool. The power rating of the whirlpool is a pleasingly low 1400W. I have not yet measured the heat loss overnight in summer.
With another potential-free contact, I switch on the heating element in the domestic hot water heat pump. This raises the temperature in the storage tank by up to 10°k to 63 °C (alternatively the heat pump with a lower maximum value). In combination, the whirlpool would have priority over the domestic hot water heat pump.
What do you think of the idea? Who knows a suitable socket? Who has a better idea?
 

Zubi123

2021-06-08 12:24:58
  • #2
The idea is good! That's how I had thought about it in theory, but I had not yet dealt with the technical implementation.
 

guckuck2

2021-06-08 13:44:45
  • #3
Are you sure that the whirlpool only draws 1.4kw? That’s not even enough for a heater, usually a whirlpool has 3-4 phases.

Completely cutting the power will also disable necessary environmental pumps. Not a good idea.
 

hampshire

2021-06-08 13:48:53
  • #4
Yes, it is only 1400 watts. It takes a very long time to heat 900l, the insulation is excellent, keeping warm requires less. The circulation pump is off for a maximum of a few hours, I see no problem with that. In normal operation, the circulation pump is not constantly on either, but only during heating periods. The manufacturer is Softub.
 

gmt94

2021-06-08 14:24:18
  • #5
I would try putting a Shelly 1 with temperature addon in the room.
 

hampshire

2021-06-08 14:48:13
  • #6
Thank you for the tip. Could not determine if the temperature sensor is suitable for water. but that could be a pretty good way - if I can use the thing without WiFi.
 

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