Pylontech Battery

The Pylontech component allows you to pull data from Pylontech Batteries into ESPHome. It uses UART for communication.

Once configured, you can use sensors as described below for your projects.

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Pylontech Batteries

Hardware Setup

You can connect to Pylontech Batteries using the port labeled “Console”. Any connections via CAN or RS485 (e.g. to an inverter) are untouched and remain functional.

The console port offers a RS232 interface using a RJ10 or RJ45 connector. The voltage levels are not TTL-compatible. A RS232 transceiver must be placed between the Batteries and the ESPHome device. MAX3232-based transceivers have been tested and work well.

If you have multiple batteries you need to connect to the master battery’s console port.

Pylontech RJ45 Console Port (US2000C, US3000C)

RJ45 Pin

Function

Connect to

3

Pylontech TX

ESPHome RX via transceiver

6

Pylontech RX

ESPHome TX via transceiver

8

GND

GND
../_images/rj45_pinout.jpg

RJ45 pinout

Pylontech RJ10 Console Pinout (US2000B)

RJ410 Pin

Function

Connect to

2

Pylontech RX

ESPHome TX via transceiver

3

Pylontech TX

ESPHome RX via transceiver

4

GND

GND

Component/Hub

# Example configuration entry
pylontech:

Configuration variables:

  • id (Required, ID): The id to use for this Pylontech component.

  • uart_id (Optional): The uart Bus ID

  • update_interval (Optional, Time): The interval to check the sensor. Defaults to 60s.

Sensor

All values are reported for every Pylontech battery individually.

# Example configuration entry
sensor:
  - platform: pylontech
    battery: 1

    voltage:
      name: "Battery1 Voltage"
    current:
      name: "Battery1 Current"
    coulomb:
      name: "Battery1 State of Charge"

Configuration variables:

  • pylontech_id (Optional): Manually specify the ID of the pylontech instance if there are multiple.

  • battery (Required): Which battery to monitor. 1 stands for the main battery, 2..6 for child batteries.

  • voltage (Optional): Voltage of the battery. All options from Sensor.

  • current (Optional): Current flowing into the battery. Negative when discharging. All options from Sensor.

  • coulomb (Optional): State of Charge in percent. All options from Sensor.

  • temperature (Optional): Temperature. All options from Sensor.

  • temperature_low (Optional): Historic minimum temperature. All options from Sensor.

  • temperature_high (Optional): Historic maximum temperature. All options from Sensor.

  • voltage_low (Optional): Voltage of the lowest cell. All options from Sensor.

  • voltage_high (Optional): Voltage of the highest cell. All options from Sensor.

  • mos_temperature (Optional): Temperature of the mosfets. All options from Sensor.

Text Sensor

# Example configuration entry
text_sensor:
  - platform: pylontech
    pylontech_id: pylontech0
    battery: 1

    base_state:
      id: bat1_base_state
      name: "Battery1 Base State"

Configuration variables:

  • pylontech_id (Optional): Manually specify the ID of the pylontech instance if there are multiple.

  • battery (Required): Which battery to monitor. 1 stands for the main battery, 2..6 for child batteries.

  • base_state (Optional): Base state. Usually reads Dischg, Charge or Idle. All options from Text Sensor.

  • voltage_state (Optional): Voltage state. Usually reads Normal. All options from Text Sensor.

  • current_state (Optional): Current state. Usually reads Normal. All options from Text Sensor.

  • temperature_state (Optional): Temperature state. Usually reads Normal. All options from Text Sensor.

Energy Monitoring

By combining template sensors and integration sensors one can monitor the energy flowing into and out of all batteries combined, ready for Homeassistant Energy Monitoring.

sensor:
  - platform: template
    id: pylontech_power
    name: "Pylontech power"
    unit_of_measurement: W
    lambda: |-
      auto pwr1 = id(bat1_voltage).state * id(bat1_current).state;
      auto pwr2 = id(bat2_voltage).state * id(bat2_current).state;
      auto pwr = pwr1 + pwr2;
      id(combined_charge_power).publish_state(max(pwr, 0.0f));
      id(combined_discharge_power).publish_state(max(-pwr, 0.0f));
      return pwr;
    update_interval: 5s
    device_class: power
    state_class: measurement

  - platform: template
    id: combined_charge_power

  - platform: template
    id: combined_discharge_power

  - platform: integration
    name: "Pylontech charging"
    sensor: combined_charge_power
    time_unit: h
    state_class: total_increasing
    device_class: energy
    unit_of_measurement: "Wh"

  - platform: integration
    name: "Pylontech discharging"
    sensor: combined_discharge_power
    time_unit: h
    state_class: total_increasing
    device_class: energy
    unit_of_measurement: "Wh"

See Also