Battery Monitor

[ErickvWyngaard (Erick)]

I have an off-grid solar system installed at my house. I have software running on a pi that gets data (Power, Volts, Amps, etc.) from the inverter and writes it to a mySQL database. I have Home Assistant running on a separate pi reading the data from the mySQL DB.

My problem is, there are no comms between my battery and my inverter, so the battery State of Charge of the battery is unknown. I only get the voltage of the battery from the inverter, which is not accurate. I am looking for a way to get an accurate SOC from the battery and displaying it in HA.

First option will be if there is a way to read the data from the integrated BMS of the battery. Thus far I have not been successful to do this. I have a Narada 48v 100ah Lithium ion Battery.

Second option is to install a third party Battery Monitor that calculate the state of charge and then sending the info to HA. Is there such a third party Battery Monitor available on the market.

[chukaonline]

Hi Eric, did you get a solution for this? I am looking for same also

[ErickvWyngaard (Erick)]

Hi,

Unfortunately I did not get a solution. I have subsequently sold my Narada battery, so I don’t need this anymore. However, the Narada battery does have a RS-485 port. If you can get or figure out the Modbus configuration, it might be a solution to get the data from the battery.

I will try and assist you of you want to give this a try

[salimayoub]

i have this problem but with esp and rs485 convert read data but
code :

esphome:
name: solar-inverter-esp32

esp32:
board: esp32dev

#////////Enable logging////////////
logger:
level: DEBUG
baud_rate: 0

#//////////////Enable Home Assistant API/////////////
api:
encryption:
key: “”
#//////////OTA/////////////
ota:
password: “”
#//////////WiFi//////////////
wifi:
ssid: Home WiFi
password: Home5642096

#////////////fallback hotspot///////////
ap:
ssid: “Narada-Bms Hotspot”
password: “internetit”
#/////////mqtt//////////
mqtt:
broker: 192.168.101.253
username: bms
password: internetit

#////////uart////////////

captive_portal:
uart:
id: uart_bus
tx_pin: GPIO19
rx_pin: GPIO18
baud_rate: 9600
data_bits: 8
stop_bits: 1

#////////////modbus//////////

modbus:
id: modbus1
flow_control_pin: GPIO4
uart_id: uart_bus
send_wait_time: 500ms

modbus_controller:

• id: epever
  address: 0x01 ## address of the ModBUS slave device on the bus
  modbus_id: modbus1
  command_throttle: 200ms
  setup_priority: -10
  update_interval: 10s

#//////////////Sensor/////////////////////////
sensor:
#//////////Cell Volte////////////////////////

• platform: modbus_controller
  modbus_controller_id: epever
  id: cell_volte_15
  name: “Cell Volte 15”
  address: 0x101C
  unit_of_measurement: “V” ## for any other unit the value is returned in minutes
  register_type: read
  value_type: U_WORD
  accuracy_decimals: 1
  filters:
  • multiply: 0.01
    #///////////////////Cell Temp/////////////////
• platform: modbus_controller
  modbus_controller_id: epever
  name: “Cell Temp 0”
  id: cell_temp_0
  register_type: holding
  address: 0x101E
  unit_of_measurement: “C”
  value_type: U_WORD
• platform: modbus_controller
  modbus_controller_id: epever
  name: “Cell Temp 1”
  id: cell_temp_1
  register_type: holding
  address: 0x101F
  unit_of_measurement: “C”
  value_type: FP32
• platform: modbus_controller
  modbus_controller_id: epever
  name: “Cell Temp 2”
  id: cell_temp_2
  register_type: holding
  address: 0x1020
  unit_of_measurement: “C”
  value_type: FP32
• platform: modbus_controller
  modbus_controller_id: epever
  name: “Cell Temp 3”
  id: cell_temp_3
  register_type: holding
  address: 0x1021
  unit_of_measurement: “C”
  value_type: U_WORD
• platform: modbus_controller
  modbus_controller_id: epever
  name: “Cell Temp 4”
  id: cell_temp_4
  register_type: holding
  address: 0x1022
  unit_of_measurement: “C”
  value_type: U_WORD
• platform: modbus_controller
  modbus_controller_id: epever
  name: “Cell Temp 5”
  id: cell_temp_5
  register_type: holding
  address: 0x1023
  unit_of_measurement: “C”
  value_type: U_WORD
• platform: modbus_controller
  modbus_controller_id: epever
  name: “Cell Temp 6”
  id: cell_temp_6
  register_type: holding
  address: 0x1024
  unit_of_measurement: “C”
  value_type: U_WORD
• platform: modbus_controller
  modbus_controller_id: epever
  name: “Cell Temp 7”
  id: cell_temp_7
  register_type: holding
  address: 0x1025
  unit_of_measurement: “C”
  value_type: U_WORD
• platform: modbus_controller
  modbus_controller_id: epever
  name: “Cell Temp 8”
  id: cell_temp_8
  register_type: holding
  address: 0x1026
  unit_of_measurement: “C”
  value_type: U_WORD
• platform: modbus_controller
  modbus_controller_id: epever
  name: “Cell Temp 9”
  id: cell_temp_9
  register_type: holding
  address: 0x1027
  unit_of_measurement: “C”
  value_type: U_WORD
• platform: modbus_controller
  modbus_controller_id: epever
  name: “Cell Temp 10”
  id: cell_temp_10
  register_type: holding
  address: 0x1028
  unit_of_measurement: “C”
  value_type: U_WORD
• platform: modbus_controller
  modbus_controller_id: epever
  name: “Cell Temp 11”
  id: cell_temp_11
  register_type: holding
  address: 0x1029
  unit_of_measurement: “C”
  value_type: U_WORD
• platform: modbus_controller
  modbus_controller_id: epever
  name: “Cell Temp 12”
  id: cell_temp_12
  register_type: holding
  address: 0x102A
  unit_of_measurement: “C”
  value_type: U_WORD
• platform: modbus_controller
  modbus_controller_id: epever
  name: “Cell Temp 13”
  id: cell_temp_13
  register_type: holding
  address: 0x102B
  unit_of_measurement: “C”
  value_type: U_WORD
• platform: modbus_controller
  modbus_controller_id: epever
  name: “Cell Temp 14”
  id: cell_temp_14
  register_type: holding
  address: 0x102C
  unit_of_measurement: “C”
  value_type: U_WORD
• platform: modbus_controller
  modbus_controller_id: epever
  name: “Cell Temp 15”
  id: cell_temp_15
  register_type: holding
  address: 0x102D
  unit_of_measurement: “C”
  value_type: U_WORD

#///////////////Cell D/////////////

• platform: modbus_controller
  modbus_controller_id: epever
  name: “Remain Capacity”
  id: remain_capacity
  register_type: holding
  address: 0x1001
  unit_of_measurement: “AH”
  value_type: U_WORD
• platform: modbus_controller
  modbus_controller_id: epever
  name: “Average Cell Temp”
  id: average_cell_temp
  register_type: holding
  address: 0x1002
  unit_of_measurement: “C”
  value_type: U_WORD
• platform: modbus_controller
  modbus_controller_id: epever
  name: “Current Battery”
  id: current_battery
  register_type: holding
  address: 0x1000
  unit_of_measurement: “AH”
  value_type: U_WORD
• platform: modbus_controller
  modbus_controller_id: epever
  name: “Cell Number”
  id: cell_number
  register_type: holding
  address: 0x100C
  unit_of_measurement: “#”
  value_type: U_WORD
• platform: modbus_controller
  modbus_controller_id: epever
  name: “Full Capacity”
  id: full_capacity
  register_type: holding
  address: 0x102E
  unit_of_measurement: “AH”
  value_type: U_WORD
• platform: modbus_controller
  modbus_controller_id: epever
  name: “Remain Charge Time”
  id: remain_charge_time
  register_type: holding
  address: 0x102F
  unit_of_measurement: “Min”
  value_type: U_WORD
• platform: modbus_controller
  modbus_controller_id: epever
  name: “Remain Discharge Time”
  id: remain_discharge_time
  register_type: holding
  address: 0x1030
  unit_of_measurement: “Min”
  value_type: U_WORD
• platform: modbus_controller
  modbus_controller_id: epever
  name: “BMS PCB TEmp”
  id: bms_pcb_temp
  register_type: holding
  address: 0x100A
  unit_of_measurement: “C”
  value_type: U_WORD

#////////////Binary Sensor////////////////////
binary_sensor:

• platform: modbus_controller
  modbus_controller_id: epever
  name: Env T
  entity_category: diagnostic
  device_class: problem
  register_type: read
  address: 0X1003

• platform: modbus_controller
  modbus_controller_id: epever
  name: Woening Flag
  entity_category: diagnostic
  device_class: problem
  register_type: read
  address: 0X1004

• platform: modbus_controller
  modbus_controller_id: epever
  name: Protection Flag
  entity_category: diagnostic
  device_class: problem
  register_type: read
  address: 0X1005

• platform: modbus_controller
  modbus_controller_id: epever
  name: Fault/Status
  entity_category: diagnostic
  device_class: problem
  register_type: read
  address: 0X1006

• platform: modbus_controller
  modbus_controller_id: epever
  name: Soc
  entity_category: diagnostic
  device_class: problem
  register_type: read
  address: 0X1007

• platform: modbus_controller
  modbus_controller_id: epever
  name: Circulate Number
  entity_category: diagnostic
  device_class: problem
  register_type: read
  address: 0X1008

• platform: modbus_controller
  modbus_controller_id: epever
  name: SOH
  entity_category: diagnostic
  device_class: problem
  register_type: read
  address: 0X1009

• platform: modbus_controller
  modbus_controller_id: epever
  name: Cell UV State
  entity_category: diagnostic
  device_class: problem
  register_type: read
  address: 0X1031

#////////////Text Sensor//////////////////////

#////////////////Switch///////////////////////

#/////////////Number/////////////////////////

#/////////////Output////////////////////////

#/////////////web Server/////////////////////
web_server:
port: 80
auth:
username: admin
password: internetit