Sending commands to the Battery?

[esanya]

Hi Markus,

this is really great projekt!

What do you think? Is is possible to implement sending configuration to the battery (change operation modes of the battery, standard power output, etc) via your SW?

are you somehow intercepting the http calls made by the APP?

Thanks,
Regards,
Sandor

[mtrossbach]

Hi Sandor,

Thank you for your kind words and interest in the project!

Currently, the software does support setting the default system output power and configuring charging/discharge limits, so those aspects of battery management are indeed possible through the existing implementation.

To do this send a MQTT message to noah2mqtt/{{your-device-serial}}/parameters/set. The payload must be a json object, containing the one or more of the following properties:

• output_power_w: Setting the system output power in Watts (minimum 0, maximum 800)
• charging_limit: Setting to upper charging limit in percent (minimum 70, maximum 100)
• discharge_limit: Setting to lower discharge limit in percent (minimum 0, maximum 30)

If you want to change the upper charging or lower discharge limit you have to include both, charging_limitand discharge_limit because the Growatt API currently only supports setting both at the same time. If you only want to set the system output power, it is ok to only send the output_power_w property, e.g.:

{
   "output_power_w": 500
}

Keep im mind, if you have set a schedule, it will always overwrite the default system output power.

However, setting the operation mode of the battery is a bit more complex. As of now, it's only possible to set the operation mode by configuring a schedule, but unfortunately, the feature to set schedules is not yet supported in the software.

Regarding your question about intercepting HTTP calls made by the app, yes, that is one of the methods used to understand and replicate the communication between the app and the battery system.

I hope this answers your questions! If you have any more suggestions or need further assistance, feel free to ask.

Best regards,
Markus

[esanya]

Thank you!