Add "minimal runtime" for i.e. Heat Pumps

[tepebox]

Is your feature request related to a problem? Please describe.
A heat pump needs extra power each time it's started. So it's not efficient to start and stop them again and again. Currently for PV loading you can define a time for the delay when not enough PV power is available to stop your heat pump. But that means that in case of a sunny day your heat pump can already run for hours but then it still consumes battery power when it gets cloudy.

Describe the solution you'd like
I would like to have another setting which defines a "minimum run-time". So i.e. I would like to see that the minimum runtime is 30min (to be efficient) but after 5 minutes of cloudy sky it stops loading (to prevent usage of battery or grid power).

Describe alternatives you've considered
No idea about alternatives...

Additional context
Still using a "User-defined heat pump (sg-ready-boost, deprecated)" but I didn't look into the new implementation for that, I guess there will be no change for this issue

[andig]

So it's not efficient to start and stop them again and again.

That's not what's happening. evcc indicates available power, but does not start/stop. So I'm not sure if this is really needed. Is this an actual or a theoretical problem?

I guess there will be no change for this issue

Wasn't changed.

/cc @premultiply

[VolkerK62]

This is an actual problem, especially with changing weather. Currently, a minimum runtime or minimum rest period can only be implemented via enable/disable delay. However, once this time has "expired," this long delay is no longer needed.

In former times it was called "guardduration".

[andig]

This is an actual problem

See #25097 (comment) above. Why and when?

[VolkerK62]

evcc indicates available power, but does not start/stop.

evcc does start/stop if it is switching the sgready contact.
But you are right in that way, that the heatpump itself will not stop or start due to internal safety settings.

[andig]

evcc does start/stop if it is switching the sgready contact.

I have to disagree. It does not. It switches normal/boost because that's what SGready does. It's the heatpump that decides to switch off afaiu.

[tepebox]

As I pointed out in my original post I'm using the SGready interface via Shellys. I know that evcc is not controlling the heat pump but controls the SGready relais. So thanks Volker for jumping in, it's a problem where I don't have any solution for. Today it was a sunny day but near sunset PV power wasn't sufficient anymore but the SGready relais was still (after hours of running) waiting the 30min I set to prevent too short runtimes. If there's any alternative please let me know, besides building HA automations to fix that... Gesendet von Outlook für Android<https://aka.ms/AAb9ysg>

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________________________________ From: andig ***@***.***> Sent: Thursday, November 6, 2025 6:15:43 PM To: evcc-io/evcc ***@***.***> Cc: tepebox ***@***.***>; Author ***@***.***> Subject: Re: [evcc-io/evcc] Add "minimal runtime" for i.e. Heat Pumps (Issue #25097) [https://avatars.githubusercontent.com/u/184815?s=20&v=4]andig left a comment (evcc-io/evcc#25097)<#25097 (comment)> evcc does start/stop if it is switching the sgready contact. I have to disagree. It does not. It switches normal/boost because that's what SGready does. It's the heatpump that decides to switch off afaiu. — Reply to this email directly, view it on GitHub<#25097 (comment)>, or unsubscribe<https://github.com/notifications/unsubscribe-auth/AH36JAFGH7MX2C47CJKFRGT33N637AVCNFSM6AAAAACLKGYOKOVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZTIOJYGQ2DANBRGM>. You are receiving this because you authored the thread.Message ID: ***@***.***>

[andig]

You‘re missing the point. Its up to the heatpump to decide how and when it wants to use the boost power.

[tepebox]

Sorry, this ist not correct... When the SGready command is set (in my case by bridging two pins on my heat pump using a Shelly relais) I/Evcc instruct the heat pump to heat up to the max. How it is doing that exactly, yes, that's done by the heat pump. And perhaps there's also a delay involved. But in general I see evcc giving the Shelly the command to close the contact, the heat starts working like crazy and only stops when it reaches the max temperature or the Shelly is opened again. This is the whole point of SGready (besides dimming for §14a). When the contract is open the heat pump operates in the normal way with the minimum temperature required to keep the home warm and cosy. This whole logic is applied when there is excessive power available from PV. The two timeouts you can set give the dalay before and after excessive power is detected. But not what I'm asking for... Please correct me if I'm wrong but this is how I understand it... Gesendet von Outlook für Android<https://aka.ms/AAb9ysg>

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________________________________ From: andig ***@***.***> Sent: Thursday, November 6, 2025 10:38:42 PM To: evcc-io/evcc ***@***.***> Cc: tepebox ***@***.***>; Author ***@***.***> Subject: Re: [evcc-io/evcc] Add "minimal runtime" for i.e. Heat Pumps (Issue #25097) [https://avatars.githubusercontent.com/u/184815?s=20&v=4]andig left a comment (evcc-io/evcc#25097)<#25097 (comment)> You‘re missing the point. Its up to the heatpump to decide how and when it wants to use the boost power. — Reply to this email directly, view it on GitHub<#25097 (comment)>, or unsubscribe<https://github.com/notifications/unsubscribe-auth/AH36JADV3RQ5SPDFXALUAS333O5WFAVCNFSM6AAAAACLKGYOKOVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZTIOJZGQ4DSOBUGE>. You are receiving this because you authored the thread.Message ID: ***@***.***>

[andig]

What you‘re describing is what the HP makes of the „power available signal“. It may not be particular,y clever about it..