Synchronize start time cyclus of mutiple thermostats

[tttopuz]

I have multiple rooms with radiators connected to a central boiler. Every room is controlled by a VTherm that controls the radiators of the room. When a radiator/underlying asks for heat, the centrail boiler turns on.

I have configured the Vtherms with the over_switch configuration, so every Vtherm have its own cyclus of turning on and off. This can cause the central boiler to be turned on and off a lot.

I was wondering if it would be possible to synchronize the start time of the Vtherm over_switch cyclus, so the times of turning on of the central boiler is minimized.

I was thinking if the cyclus could always be configured from the whole hour, everything is synchronized. If the cyclus length for example is 30 minutes, the start times could be 13:00 and 13:30. Likewise if the cyclus length is 10 minutes, they could start at 13:00, 13:10, etc.

You always want to start the first cyclus after turning on the thermostat, because you don't want to wait for the next synchronized time. A solution for this could be to always use a short first cyclus that ends at the start of the next cyclus.

[jmcollin78]

Hello @tttopuz ,

There is no way to ensure all cycles are starting simultaneously. On the contrary, when over_switch are used it is mostly for electrical heater and you don't want to synchronize them to avoid pic of consumption.

In your case, I think that If you set all cycle to the same value, all heating phases will start at the same time. But, this will vary over time until the next HA restarts. So this is not a real solution.