Hello. I have a MultiPlus-II 3000 inverter + Raspberry Pi 3 (Venus OS) for control + MK3-USB.
I want to charge the batteries at a specific time (for example, only at night when I have cheap electricity), as well as discharge in the evening in the network when electricity is expensive. I experimented with manually controlling ESS-> GridSetpoint, but would like to do it automatically. Is such functionality already implemented? If not, tell me how I can implement it?
Hi,
you could use Modbus TCP to set the Grid Setpoint from a PLC or some other control computer.
See here: https://www.victronenergy.com/live/ccgx:modbustcp_faq
Grid power setpoint - Modbus-TCP register 2700
Positive: take power from grid. Negative: send power to grid.
Default: 30 W.
This register has range -32768W to 32767W (scale factor=1). Use register 2703 for a larger range (scale factor=0.01).
Best Regards,
Markus
Yes, we have done this before with Control4 home automation with a ModbusTCP driver to write to the registers - in our case 2703 because it was a large system.
Any clue?
Thank you very much.
I managed to understand the Modbus-TCP protocol.
In my case it was 37 register. I can change the value manually using the Modbus Poll program.
Now I will think about further implementation.
You can also set the grid setpoint via MQTT.
Jens
