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esp32-example.yaml
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esp32-example.yaml
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substitutions:
name: pace-bms
device_description: "Monitor and control a PACE BMS via RS485 (Modbus)"
tx_pin: GPIO16
rx_pin: GPIO17
flow_control_pin: GPIO18
esphome:
name: ${name}
comment: ${device_description}
min_version: 2024.6.0
project:
name: "syssi.esphome-pace-bms"
version: 2.0.0
esp32:
board: wemos_d1_mini32
framework:
type: esp-idf
wifi:
ssid: !secret wifi_ssid
password: !secret wifi_password
ota:
platform: esphome
logger:
level: DEBUG
# If you use Home Assistant please remove this `mqtt` section and uncomment the `api` component!
# The native API has many advantages over MQTT: https://esphome.io/components/api.html#advantages-over-mqtt
mqtt:
broker: !secret mqtt_host
username: !secret mqtt_username
password: !secret mqtt_password
id: mqtt_client
# api:
uart:
- id: uart_0
baud_rate: 9600
tx_pin: ${tx_pin}
rx_pin: ${rx_pin}
debug:
direction: BOTH
dummy_receiver: false
modbus:
- id: modbus0
uart_id: uart_0
flow_control_pin: ${flow_control_pin}
send_wait_time: 200ms
modbus_controller:
- id: bms0
# Slave address 0x01
address: 0x01
modbus_id: modbus0
command_throttle: 200ms
update_interval: 10s
binary_sensor:
# 11 Status/Fault flag 2 byte R uint16 Hex See ^3
# Bit 8: Status: Charging operation
- platform: modbus_controller
modbus_controller_id: bms0
name: "${name} charging operation"
address: 11
register_type: holding
bitmask: 0x0100
# Bit 9: Status: Discharging operation
- platform: modbus_controller
modbus_controller_id: bms0
name: "${name} discharging operation"
address: 11
register_type: holding
bitmask: 0x0200
# Bit 10: Status: Charging enabled/disabled
- platform: modbus_controller
modbus_controller_id: bms0
name: "${name} charging"
address: 11
register_type: holding
bitmask: 0x0400
# Bit 11: Status: Discharging enabled/disabled
- platform: modbus_controller
modbus_controller_id: bms0
name: "${name} discharging"
address: 11
register_type: holding
bitmask: 0x0800
# 12 Balance status-bits per cell (1-16) 2 byte R uint16 Hex
# Bit 1: Status: Balancing cell 1
- platform: modbus_controller
modbus_controller_id: bms0
name: "${name} cell balancing 1"
address: 12
register_type: holding
bitmask: 0x0001
# Bit 2: Status: Balancing cell 2
- platform: modbus_controller
modbus_controller_id: bms0
name: "${name} cell balancing 2"
address: 12
register_type: holding
bitmask: 0x0002
# Bit 3: Status: Balancing cell 3
- platform: modbus_controller
modbus_controller_id: bms0
name: "${name} cell balancing 3"
address: 12
register_type: holding
bitmask: 0x0004
# Bit 4: Status: Balancing cell 4
- platform: modbus_controller
modbus_controller_id: bms0
name: "${name} cell balancing 4"
address: 12
register_type: holding
bitmask: 0x0008
# Bit 5: Status: Balancing cell 5
- platform: modbus_controller
modbus_controller_id: bms0
name: "${name} cell balancing 5"
address: 12
register_type: holding
bitmask: 0x0010
# Bit 6: Status: Balancing cell 6
- platform: modbus_controller
modbus_controller_id: bms0
name: "${name} cell balancing 6"
address: 12
register_type: holding
bitmask: 0x0020
# Bit 7: Status: Balancing cell 7
- platform: modbus_controller
modbus_controller_id: bms0
name: "${name} cell balancing 7"
address: 12
register_type: holding
bitmask: 0x0040
# Bit 8: Status: Balancing cell 8
- platform: modbus_controller
modbus_controller_id: bms0
name: "${name} cell balancing 8"
address: 12
register_type: holding
bitmask: 0x0080
# Bit 9: Status: Balancing cell 9
- platform: modbus_controller
modbus_controller_id: bms0
name: "${name} cell balancing 9"
address: 12
register_type: holding
bitmask: 0x0100
# Bit 10: Status: Balancing cell 10
- platform: modbus_controller
modbus_controller_id: bms0
name: "${name} cell balancing 10"
address: 12
register_type: holding
bitmask: 0x0200
# Bit 11: Status: Balancing cell 11
- platform: modbus_controller
modbus_controller_id: bms0
name: "${name} cell balancing 11"
address: 12
register_type: holding
bitmask: 0x0400
# Bit 12: Status: Balancing cell 12
- platform: modbus_controller
modbus_controller_id: bms0
name: "${name} cell balancing 12"
address: 12
register_type: holding
bitmask: 0x0800
# Bit 13: Status: Balancing cell 13
- platform: modbus_controller
modbus_controller_id: bms0
name: "${name} cell balancing 13"
address: 12
register_type: holding
bitmask: 0x1000
# Bit 14: Status: Balancing cell 14
- platform: modbus_controller
modbus_controller_id: bms0
name: "${name} cell balancing 14"
address: 12
register_type: holding
bitmask: 0x2000
# Bit 15: Status: Balancing cell 15
- platform: modbus_controller
modbus_controller_id: bms0
name: "${name} cell balancing 15"
address: 12
register_type: holding
bitmask: 0x4000
# Bit 16: Status: Balancing cell 16
- platform: modbus_controller
modbus_controller_id: bms0
name: "${name} cell balancing 16"
address: 12
register_type: holding
bitmask: 0x8000
sensor:
# 0 Current 2 byte R int16 10mA (Positive: chargingm Negative: discharging)
- platform: modbus_controller
modbus_controller_id: bms0
name: "${name} current"
address: 0
register_type: holding
value_type: S_WORD
unit_of_measurement: "A"
device_class: current
state_class: measurement
accuracy_decimals: 2
filters:
- multiply: 0.01
# 1 Voltage of pack 2 byte R uint16 10mV
- platform: modbus_controller
modbus_controller_id: bms0
name: "${name} total voltage"
address: 1
register_type: holding
value_type: U_WORD
unit_of_measurement: "V"
device_class: voltage
state_class: measurement
accuracy_decimals: 2
filters:
- multiply: 0.01
- platform: modbus_controller
modbus_controller_id: bms0
name: "${name} power"
address: 0
register_type: holding
value_type: U_WORD
register_count: 2
response_size: 4
unit_of_measurement: "W"
device_class: power
state_class: measurement
accuracy_decimals: 2
lambda: |-
if (data.size() < 4) {
return NAN;
}
float current = (int16_t)(data[0] << 8 | data[1] << 0);
float total_voltage = (uint16_t)(data[2] << 8 | data[3] << 0);
return current * total_voltage * 0.0001f;
# 2 State of charge 2 byte R uint8 % (0-100%)
- platform: modbus_controller
modbus_controller_id: bms0
name: "${name} state of charge"
address: 2
register_type: holding
value_type: U_WORD
unit_of_measurement: "%"
device_class: battery
state_class: measurement
accuracy_decimals: 0
# 3 SOH 2 byte R uint8 % (0-100%)
- platform: modbus_controller
modbus_controller_id: bms0
name: "${name} state of health"
address: 3
register_type: holding
value_type: U_WORD
unit_of_measurement: "%"
state_class: measurement
accuracy_decimals: 0
# 4 Remain capacity 2 byte R uint16 10mAH
- platform: modbus_controller
modbus_controller_id: bms0
name: "${name} remaining capacity"
address: 4
register_type: holding
value_type: U_WORD
unit_of_measurement: "Ah"
state_class: measurement
accuracy_decimals: 2
filters:
- multiply: 0.01
# 5 Full capacity 2 byte R uint16 10mAH
- platform: modbus_controller
modbus_controller_id: bms0
name: "${name} full capacity"
address: 5
register_type: holding
value_type: U_WORD
unit_of_measurement: "Ah"
state_class: measurement
accuracy_decimals: 2
filters:
- multiply: 0.01
# 6 Design capacity 2 byte R uint16 10mAH
- platform: modbus_controller
modbus_controller_id: bms0
name: "${name} design capacity"
address: 6
register_type: holding
value_type: U_WORD
unit_of_measurement: "Ah"
state_class: measurement
accuracy_decimals: 2
filters:
- multiply: 0.01
# 7 Charging cycles count 2 byte R uint16 Cyc.
- platform: modbus_controller
modbus_controller_id: bms0
name: "${name} charging cycles"
address: 7
register_type: holding
value_type: U_WORD
unit_of_measurement: ""
state_class: measurement
accuracy_decimals: 0
# 8 Reserved
# 9 Warning flag 2 byte R uint16 Hex See ^1
- platform: modbus_controller
modbus_controller_id: bms0
name: "${name} warnings bitmask"
address: 9
register_type: holding
value_type: U_WORD
unit_of_measurement: ""
state_class: measurement
accuracy_decimals: 0
# 10 Protection flag 2 byte R uint16 Hex See ^2
- platform: modbus_controller
modbus_controller_id: bms0
name: "${name} protections bitmask"
address: 10
register_type: holding
value_type: U_WORD
unit_of_measurement: ""
state_class: measurement
accuracy_decimals: 0
# 11 Status/Fault flag 2 byte R uint16 Hex See ^3
- platform: modbus_controller
modbus_controller_id: bms0
name: "${name} fault status bitmask"
address: 11
register_type: holding
value_type: U_WORD
unit_of_measurement: ""
state_class: measurement
accuracy_decimals: 0
# 12 Balance status-bits per cell (1-16) 2 byte R uint16 Hex
- platform: modbus_controller
modbus_controller_id: bms0
name: "${name} balancer status"
address: 12
register_type: holding
value_type: U_WORD
unit_of_measurement: ""
state_class: measurement
accuracy_decimals: 0
# 13 Reserved
# 14 Reserved
# 15 Cell voltage 1 2 byte R uint16 mV
- platform: modbus_controller
modbus_controller_id: bms0
name: "${name} cell voltage 1"
address: 15
register_type: holding
value_type: U_WORD
unit_of_measurement: "V"
state_class: measurement
accuracy_decimals: 3
filters:
- multiply: 0.001
# 16 Cell voltage 2 2 byte R uint16 mV
- platform: modbus_controller
modbus_controller_id: bms0
name: "${name} cell voltage 2"
address: 16
register_type: holding
value_type: U_WORD
unit_of_measurement: "V"
state_class: measurement
accuracy_decimals: 3
filters:
- multiply: 0.001
# 17 Cell voltage 3 2 byte R uint16 mV
- platform: modbus_controller
modbus_controller_id: bms0
name: "${name} cell voltage 3"
address: 17
register_type: holding
value_type: U_WORD
unit_of_measurement: "V"
state_class: measurement
accuracy_decimals: 3
filters:
- multiply: 0.001
# 18 Cell voltage 4 2 byte R uint16 mV
- platform: modbus_controller
modbus_controller_id: bms0
name: "${name} cell voltage 4"
address: 18
register_type: holding
value_type: U_WORD
unit_of_measurement: "V"
state_class: measurement
accuracy_decimals: 3
filters:
- multiply: 0.001
# 19 Cell voltage 5 2 byte R uint16 mV
- platform: modbus_controller
modbus_controller_id: bms0
name: "${name} cell voltage 5"
address: 19
register_type: holding
value_type: U_WORD
unit_of_measurement: "V"
state_class: measurement
accuracy_decimals: 3
filters:
- multiply: 0.001
# 20 Cell voltage 6 2 byte R uint16 mV
- platform: modbus_controller
modbus_controller_id: bms0
name: "${name} cell voltage 6"
address: 20
register_type: holding
value_type: U_WORD
unit_of_measurement: "V"
state_class: measurement
accuracy_decimals: 3
filters:
- multiply: 0.001
# 21 Cell voltage 7 2 byte R uint16 mV
- platform: modbus_controller
modbus_controller_id: bms0
name: "${name} cell voltage 7"
address: 21
register_type: holding
value_type: U_WORD
unit_of_measurement: "V"
state_class: measurement
accuracy_decimals: 3
filters:
- multiply: 0.001
# 22 Cell voltage 8 2 byte R uint16 mV
- platform: modbus_controller
modbus_controller_id: bms0
name: "${name} cell voltage 8"
address: 22
register_type: holding
value_type: U_WORD
unit_of_measurement: "V"
state_class: measurement
accuracy_decimals: 3
filters:
- multiply: 0.001
# 23 Cell voltage 9 2 byte R uint16 mV
- platform: modbus_controller
modbus_controller_id: bms0
name: "${name} cell voltage 9"
address: 23
register_type: holding
value_type: U_WORD
unit_of_measurement: "V"
state_class: measurement
accuracy_decimals: 3
filters:
- multiply: 0.001
# 24 Cell voltage 10 2 byte R uint16 mV
- platform: modbus_controller
modbus_controller_id: bms0
name: "${name} cell voltage 10"
address: 24
register_type: holding
value_type: U_WORD
unit_of_measurement: "V"
state_class: measurement
accuracy_decimals: 3
filters:
- multiply: 0.001
# 25 Cell voltage 11 2 byte R uint16 mV
- platform: modbus_controller
modbus_controller_id: bms0
name: "${name} cell voltage 11"
address: 25
register_type: holding
value_type: U_WORD
unit_of_measurement: "V"
state_class: measurement
accuracy_decimals: 3
filters:
- multiply: 0.001
# 26 Cell voltage 12 2 byte R uint16 mV
- platform: modbus_controller
modbus_controller_id: bms0
name: "${name} cell voltage 12"
address: 26
register_type: holding
value_type: U_WORD
unit_of_measurement: "V"
state_class: measurement
accuracy_decimals: 3
filters:
- multiply: 0.001
# 27 Cell voltage 13 2 byte R uint16 mV
- platform: modbus_controller
modbus_controller_id: bms0
name: "${name} cell voltage 13"
address: 27
register_type: holding
value_type: U_WORD
unit_of_measurement: "V"
state_class: measurement
accuracy_decimals: 3
filters:
- multiply: 0.001
# 28 Cell voltage 14 2 byte R uint16 mV
- platform: modbus_controller
modbus_controller_id: bms0
name: "${name} cell voltage 14"
address: 28
register_type: holding
value_type: U_WORD
unit_of_measurement: "V"
state_class: measurement
accuracy_decimals: 3
filters:
- multiply: 0.001
# 29 Cell voltage 15 2 byte R uint16 mV
- platform: modbus_controller
modbus_controller_id: bms0
name: "${name} cell voltage 15"
address: 29
register_type: holding
value_type: U_WORD
unit_of_measurement: "V"
state_class: measurement
accuracy_decimals: 3
filters:
- multiply: 0.001
# 30 Cell voltage 16 2 byte R uint16 mV
- platform: modbus_controller
modbus_controller_id: bms0
name: "${name} cell voltage 16"
address: 30
register_type: holding
value_type: U_WORD
unit_of_measurement: "V"
state_class: measurement
accuracy_decimals: 3
filters:
- multiply: 0.001
### Calculated sensors
# Delta cell voltage
- platform: modbus_controller
modbus_controller_id: bms0
name: "${name} delta cell voltage"
address: 15
register_type: holding
value_type: U_WORD
register_count: 16
response_size: 32
unit_of_measurement: "V"
device_class: voltage
state_class: measurement
accuracy_decimals: 3
lambda: |-
uint8_t cells = 16;
if (data.size() < cells * 2) {
return NAN;
}
float min_cell_voltage = 100.0f;
float max_cell_voltage = -100.0f;
float average_cell_voltage = 0.0f;
uint8_t min_voltage_cell = 0;
uint8_t max_voltage_cell = 0;
for (uint8_t i = 0; i < cells; i++) {
float cell_voltage = (uint16_t)(data[item->offset + (i * 2)] << 8 | data[item->offset + (i * 2) + 1] << 0) * 0.001f;
average_cell_voltage = average_cell_voltage + cell_voltage;
if (cell_voltage < min_cell_voltage) {
min_cell_voltage = cell_voltage;
min_voltage_cell = i + 1;
}
if (cell_voltage > max_cell_voltage) {
max_cell_voltage = cell_voltage;
max_voltage_cell = i + 1;
}
}
average_cell_voltage = average_cell_voltage / cells;
id(bms0_average_cell_voltage).publish_state(average_cell_voltage);
id(bms0_min_cell_voltage).publish_state(min_cell_voltage);
id(bms0_max_cell_voltage).publish_state(max_cell_voltage);
id(bms0_min_voltage_cell).publish_state(min_voltage_cell);
id(bms0_max_voltage_cell).publish_state(max_voltage_cell);
return max_cell_voltage - min_cell_voltage;
- platform: template
id: bms0_average_cell_voltage
name: "${name} average cell voltage"
update_interval: never
unit_of_measurement: V
device_class: voltage
state_class: measurement
accuracy_decimals: 3
- platform: template
id: bms0_min_cell_voltage
name: "${name} min cell voltage"
update_interval: never
unit_of_measurement: V
device_class: voltage
state_class: measurement
accuracy_decimals: 3
- platform: template
id: bms0_max_cell_voltage
name: "${name} max cell voltage"
update_interval: never
unit_of_measurement: V
device_class: voltage
state_class: measurement
accuracy_decimals: 3
- platform: template
id: bms0_min_voltage_cell
name: "${name} min voltage cell"
update_interval: never
unit_of_measurement: ""
state_class: measurement
accuracy_decimals: 0
- platform: template
id: bms0_max_voltage_cell
name: "${name} max voltage cell"
update_interval: never
unit_of_measurement: ""
state_class: measurement
accuracy_decimals: 0
####
# 31 Battery temperature 1 2 byte R int16 0.1 ℃
- platform: modbus_controller
modbus_controller_id: bms0
name: "${name} battery temperature 1"
address: 31
register_type: holding
value_type: S_WORD
unit_of_measurement: "˚C"
device_class: temperature
state_class: measurement
accuracy_decimals: 1
filters:
- multiply: 0.1
# 32 Battery temperature 2 2 byte R int16 0.1 ℃
- platform: modbus_controller
modbus_controller_id: bms0
name: "${name} battery temperature 2"
address: 32
register_type: holding
value_type: S_WORD
unit_of_measurement: "˚C"
device_class: temperature
state_class: measurement
accuracy_decimals: 1
filters:
- multiply: 0.1
# 33 Battery temperature 3 2 byte R int16 0.1 ℃
- platform: modbus_controller
modbus_controller_id: bms0
name: "${name} battery temperature 3"
address: 33
register_type: holding
value_type: S_WORD
unit_of_measurement: "˚C"
device_class: temperature
state_class: measurement
accuracy_decimals: 1
filters:
- multiply: 0.1
# 34 Battery temperature 4 2 byte R int16 0.1 ℃
- platform: modbus_controller
modbus_controller_id: bms0
name: "${name} battery temperature 4"
address: 34
register_type: holding
value_type: S_WORD
unit_of_measurement: "˚C"
device_class: temperature
state_class: measurement
accuracy_decimals: 1
filters:
- multiply: 0.1
# 35 MOSFET temperature 2 byte R int16 0.1 ℃ or invalid
- platform: modbus_controller
modbus_controller_id: bms0
name: "${name} mosfet temperature"
address: 35
register_type: holding
value_type: S_WORD
unit_of_measurement: "˚C"
device_class: temperature
state_class: measurement
accuracy_decimals: 1
filters:
- multiply: 0.1
# 36 Environment temperature 2 byte R int16 0.1 ℃ or invalid
- platform: modbus_controller
modbus_controller_id: bms0
name: "${name} environment temperature"
address: 36
register_type: holding
value_type: S_WORD
unit_of_measurement: "˚C"
device_class: temperature
state_class: measurement
accuracy_decimals: 1
filters:
- multiply: 0.1
# 37-59 Reserved
number:
# 60 Pack OV alarm 2 byte RW uint16 mV
- platform: modbus_controller
modbus_controller_id: bms0
name: "${name} pack overvoltage alarm"
use_write_multiple: true
address: 60
register_type: holding
value_type: U_WORD
min_value: 0.0
max_value: 65535.0
step: 1
mode: box
unit_of_measurement: "mV"
# 61 Pack OV protection 2 byte RW uint16 mV
- platform: modbus_controller
modbus_controller_id: bms0
name: "${name} pack overvoltage protection"
use_write_multiple: true
address: 61
register_type: holding
value_type: U_WORD
min_value: 0.0
max_value: 65535.0
step: 1
mode: box
unit_of_measurement: "mV"
# 62 Pack OV release protection 2 byte RW uint16 mV
- platform: modbus_controller
modbus_controller_id: bms0
name: "${name} pack overvoltage protection release"
use_write_multiple: true
address: 62
register_type: holding
value_type: U_WORD
min_value: 0.0
max_value: 65535.0
step: 1
mode: box
unit_of_measurement: "mV"
# 63 Pack OV protection delay time 2 byte RW uint8 0.1S 1~255
- platform: modbus_controller
modbus_controller_id: bms0
name: "${name} pack overvoltage protection delay time"
use_write_multiple: true
address: 63
register_type: holding
value_type: U_WORD
lambda: "return x * 0.1f; "
write_lambda: "return x * 10.0f;"
min_value: 0.1
max_value: 25.5
step: 0.1
mode: box
unit_of_measurement: "s"
# 64 Cell OV alarm 2 byte RW uint16 mV
- platform: modbus_controller
modbus_controller_id: bms0
name: "${name} cell overvoltage alarm"
use_write_multiple: true
address: 64
register_type: holding
value_type: U_WORD
min_value: 0.0
max_value: 65535.0
step: 1
mode: box
unit_of_measurement: "mV"
# 65 Cell OV protection 2 byte RW uint16 mV
- platform: modbus_controller
modbus_controller_id: bms0
name: "${name} cell overvoltage protection"
use_write_multiple: true
address: 65
register_type: holding
value_type: U_WORD
min_value: 0.0
max_value: 65535.0
step: 1
mode: box
unit_of_measurement: "mV"
# 66 Cell OV release protection 2 byte RW uint16 mV
- platform: modbus_controller
modbus_controller_id: bms0
name: "${name} cell overvoltage protection release"
use_write_multiple: true
address: 66
register_type: holding
value_type: U_WORD
min_value: 0.0
max_value: 65535.0
step: 1
mode: box
unit_of_measurement: "mV"
# 67 Cell OV protection delay time 2 byte RW uint8 0.1S 1~255
- platform: modbus_controller
modbus_controller_id: bms0
name: "${name} cell overvoltage protection delay time"
use_write_multiple: true
address: 67
register_type: holding
value_type: U_WORD
lambda: "return x * 0.1f; "
write_lambda: "return x * 10.0f;"
min_value: 0.1
max_value: 25.5
step: 0.1
mode: box
unit_of_measurement: "s"
# 68 Pack UV alarm 2 byte RW uint16 mV
- platform: modbus_controller
modbus_controller_id: bms0
name: "${name} pack undervoltage alarm"
use_write_multiple: true
address: 68
register_type: holding
value_type: U_WORD
min_value: 0.0
max_value: 65535.0
step: 1
mode: box
unit_of_measurement: "mV"
# 69 Pack UV protection 2 byte RW uint16 mV
- platform: modbus_controller
modbus_controller_id: bms0
name: "${name} pack undervoltage protection"
use_write_multiple: true
address: 69
register_type: holding
value_type: U_WORD
min_value: 0.0
max_value: 65535.0
step: 1
mode: box
unit_of_measurement: "mV"
# 70 Pack UV release protection 2 byte RW uint16 mV
- platform: modbus_controller
modbus_controller_id: bms0
name: "${name} pack undervoltage protection release"
use_write_multiple: true
address: 70
register_type: holding
value_type: U_WORD
min_value: 0.0
max_value: 65535.0
step: 1
mode: box
unit_of_measurement: "mV"
# 71 Pack UV protection delay time 2 byte RW uint8 0.1S 1~255
- platform: modbus_controller
modbus_controller_id: bms0
name: "${name} pack undervoltage protection delay time"
use_write_multiple: true
address: 71
register_type: holding
value_type: U_WORD
lambda: "return x * 0.1f; "
write_lambda: "return x * 10.0f;"
min_value: 0.1
max_value: 25.5
step: 0.1
mode: box
unit_of_measurement: "s"
# 72 Cell UV alarm 2 byte RW uint16 mV
- platform: modbus_controller
modbus_controller_id: bms0
name: "${name} cell undervoltage alarm"
use_write_multiple: true
address: 72
register_type: holding
value_type: U_WORD
min_value: 0.0
max_value: 65535.0
step: 1
mode: box
unit_of_measurement: "mV"
# 73 Cell UV protection 2 byte RW uint16 mV
- platform: modbus_controller
modbus_controller_id: bms0
name: "${name} cell undervoltage protection"
use_write_multiple: true
address: 73
register_type: holding
value_type: U_WORD
min_value: 0.0
max_value: 65535.0
step: 1
mode: box
unit_of_measurement: "mV"
# 74 Cell UV release protection 2 byte RW uint16 mV
- platform: modbus_controller
modbus_controller_id: bms0
name: "${name} cell undervoltage protection release"
use_write_multiple: true
address: 74
register_type: holding
value_type: U_WORD
min_value: 0.0
max_value: 65535.0
step: 1
mode: box
unit_of_measurement: "mV"