prevent discharge of battery while ev is charging

[hschroda]

I came across that interesting project while searching for a solution how to prevent my battery from being discharged during my car's charging process. Do you see a chance/possibility to integrate a workflow, that sends a short command to the battery management to prevent to discharge the moment the charging process starts and also another command, to enable charging after finishing. Thanks a lot?

[davbauer]

Hi @hschroda,

This project probably still needs a lot of work, since its currently very specific to my use case at home.

So basically you would want to have a toggle switch which would periodically check if your car is charging and then not allowing the battery to discharge? Is that correct?

Could you also give me insights into the exact

• Inverter Systems
• Battery Management Systems
• Charging Systems you have at home

Further I would rather considering updating the following repository: https://github.com/davbauer/ocpp-manager to include more integrations since it uses a standardized way of communicating with all kinds of EV Charging systems using the OCPP Protocol.

[hschroda]

Hi David, thanks for your immediate reply! A toggle switch is a great idea. I understand your usecase and mine is different, however there's nothing I could find that comes even closer. My systems looks like this: * Symo Gen24 Inverter by Fronius * Fronius Wattpilot Wallbox * BYD battery stack The moment the wallbox starts charging, the Gen24 should stop being discharged at all, there are such rules which I currently need to set manually inside the battery management of Gen24. Thanks, Helge

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________________________________ Von: David Bauer ***@***.***> Gesendet: Sonntag, 23. März 2025 10:56 An: davbauer/chargeController ***@***.***> Cc: hschroda ***@***.***>; Mention ***@***.***> Betreff: Re: [davbauer/chargeController] prevent discharge of battery while ev is charging (Discussion #101) Hi @hschroda<https://github.com/hschroda>, This project probably still needs a lot of work, since its currently very specific to my use case at home. So basically you would want to have a toggle switch which would periodically check if your car is charging and then not allowing the battery to discharge? Is that correct? Could you also give me insights into the exact * Inverter Systems * Battery Management Systems * Charging Systems you have at home Further I would rather considering updating the following repository: https://github.com/davbauer/ocpp-manager to include more integrations since it uses a standardized way of communicating with all kinds of EV Charging systems using the OCPP Protocol. — Reply to this email directly, view it on GitHub<#101 (comment)>, or unsubscribe<https://github.com/notifications/unsubscribe-auth/ACAC7ZTP4GAJK74BMOPMHZT2V2ANFAVCNFSM6AAAAABZS2FIPOVHI2DSMVQWIX3LMV43URDJONRXK43TNFXW4Q3PNVWWK3TUHMYTENJZGE2TGMI>. You are receiving this because you were mentioned.Message ID: ***@***.***>

[davbauer]

Thanks for letting me know your setup.

But since I cant really reproduce your setup and I am currently very limited on time, I would suggest you look into setting up HomeAssistant in your home network instead and integrating all your devices there.

Further it seems like some people already implemented a solution for your exact issue. Like here:
https://community.home-assistant.io/t/fronius-symo-gen-24-plus-batteries/466417/4

General Home Assistant Reference: https://www.home-assistant.io/

Let me know if that helped.