Feed-in restrictions

[josef232]

Hello, I have your software running on an ESP32 and use it to read a JK BMS. I pass the required data to my Goodwe 10k inverter and have adapted your software slightly (through trial and error :-))

Since our power grid operator only allows a feed-in of 4000W, on sunny Days i only want to charge the battery when the 4000W grid feed-in has been reached.

I used the following program part from you to read out the watts supplied/delivered into the grid via the Goodwe inverter, this works really well. But I'm having trouble processing the data, so I wanted to ask you if you could help me here.

My approach would be to define a variable that can be between 0 and 25 (this would be my charging current that I pass on to the inverter)

If more than 4000W is now supplied to the network, this variable should increase in steps of 1 every 10 seconds.
If less than 3900W is supplied to the network, this variable should decrease in steps of 1 every 10 seconds.

For the newer Goodwe 20k-et and 30k-et devices, the manufacturer offers the intelligent charging function.

But with this "small" program, my inverter should also work well enough to feed as much as possible into the grid on sunny days,

substitutions:
# --------------------------
# name that will appear in esphome and homeassistant.
  name: bmssolar


# --------------------------------------
# Battery State of Health (SOH) setting:
# Maximum charging cycles is used to calculate the battey SOH, LF280K=6000.0 LF280=3000.0 (decimal is required)
  max_cycles: "6000.0"
# --------------------------------------
# ESP32 CAN/Serail port pins:
# GPIO pins your CAN bus transceiver(TJA1050) is connected to the ESP, note! TX->TX and RX->RX. 
#  can_tx_pin: GPIO23
#  can_rx_pin: GPIO22
# GPIO pins your JK-BMS RS485(TTL) is connected to the ESP TX->RX and RX->TX. 
  tx_pin: GPIO1
  rx_pin: GPIO3
# --------------------------------------

Thank you very much Josef


esphome:
  name: bmssolar
  friendly_name: bmssolar

esp32:
  board: esp32dev
  framework:
    type: arduino

logger:
  baud_rate: 0



globals:
  - id: can_420_rx
    type: int
    restore_value: no
    initial_value: '0'
  - id: charge_status
    type: std::string
    restore_value: no
    initial_value: '"Startup"'

button:
  - platform: restart
    name: "Restart button"
    id: restart_button
    internal: true

wifi:
  ssid: xxxx
  password: xxxx

  # Enable fallback hotspot (captive portal) in case wifi connection fails
  ap:
    ssid: "BmsSolar Fallback Hotspot"
    password: "xxxx

# Enable Home Assistant API
api:
  encryption:
    key: "xxxx
ota:
  password: xxxx

#

uart:
  id: uart_0
  baud_rate: 9600
  rx_buffer_size: 384
  tx_pin: ${tx_pin}
  rx_pin: ${rx_pin}

modbus:
    id: modbus0
    uart_id: uart_0
    send_wait_time: 300ms

modbus_controller:
    id: bms0
    address: 247
    modbus_id: modbus0
    command_throttle: 300ms
    update_interval: 1s

sensor:
  # 1000    Leistung                R    UINT16    2    Watt
  - platform: modbus_controller
    modbus_controller_id: bms0
    name: "Leistung"
    address: 35140
    register_type: holding
    value_type: U_WORD
    unit_of_measurement: "W"
    device_class: energy
    state_class: measurement
    accuracy_decimals: 1
    filters:
      - multiply: 1

[syssi]

Your YAML configuration looks incomplete and misses the important parts. :-) Do you like to share your complete solution here?