[ENHANCEMENT]: Heating water temp setpoint adjustment according to solar power export to grid

[mieschc]

As mentioned in the other topic I opened a new one for this enhancement. It would be a similiar function like the RTC mode, but instead of using the room temp as basis the solar power export to the grid should be used.

The basic heating water setpoint should be set via the WAR/Compensation Curve. This setpoint should be increased by value X (e.g. 0 to 5) depending on the solar power export to the grid (e.g. >1,5kW export to the grid, adjust heating water setpoint to +1). A fallback to setpoint +/-0 when solar export is below a treshold (e.g. 0,5kW) or 0kW would be nice too.

In the end it would be a mixture from the DHW Solar mode and the RTC mode.

[hoeckelp]

Very nice idea, I also wish. Preferably with self-defined thresholds.

[edterbak]

Hi,

Thank you both for the posts.
I am still thinking about the usecase. I personally would not have it like that. I dont see the 'why someone would want this' Probably becasue I dont know your situation.
What is your situation? Pool heating maybe or are you not using floorheating but radiators only? Buffertank?

Technically this request can be realised.

[mieschc]

Moin,

I am not sure, but you are living in the Netherlands? If I am correctly informed you have a different system for your solar plants. In Germany we get a certain amount of money for each kWh exported to the grid (0,075 EUR in my case). For each imported kWh from the grid I have to pay appr. 0,30 EUR to the energy company and I assume that the price will rise end of the year. Therefore I try to maximize the own solar energy usage in daylight hours (dryer, washing machine, dish washer etc.) and to cut consumption at night.

To avoid paying 0,30 EUR for each kWh for the heat pump at night the plan is to overheat the house by appr 1-2°C over the day (e.g. 23° instead of 21°) and to use a bigger night reduction to minimze heat pump use over night.

At the moment I try to realize this just with the timer, which of course does not know if I have enough solar power available. Above function would make it possible to overheat only if enough solar power is available. Your RTC function in addition can adjust the setpoint if e.g. overheating during the day or heat loss over night is getting to much.

[cvastag]

This feature would be very nice.

[cvastag]

Is there anything new about the feature? Similar to an SG READY, it would also be sufficient to increase the temperature

[edterbak]

No not yet.
There are a number of critical issues to fix first befor adding new functionality. Sorry.

[edterbak]

Is there anything new about the feature? Similar to an SG READY, it would also be sufficient to increase the temperature

Hi,

I havent read this issue for a while. Just did.
in current build (v23.08) there is a scheduler task to set the setpoint of the room (RTC) or set the water temperature directly.
I dont know if you have seen this already. But this might already 'give' something already. Of course this is only time based, not power based.

But other than that, I will be writing some more functions for solar > power prices in future.
I need to gather all thoughts abou tthis, consolidate it into a plan of attack etc.. how to build/design etc.

It is not off the table :)

Regards.