/esphome-pace-bms

ESPHome component to monitor and control a PACE Battery Management System (PACE-BMS) via RS485 (Modbus)

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esphome-pace-bms

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ESPHome configuration to monitor and control a PACE Battery Management System (PACE-BMS) via RS485 (Modbus)

This project implements the PACE_MODBUS protocol. Please use the RS485 port next to the CAN bus port and enable the protocol using the PbmsTools.exe (System Config -> Inverter protocol -> RS485 Protocol).

Supported devices

  • Katbatt 6.4kWh LiFePO4 Stackable Battery, PACE BMS P16S200A (P16S200A-21473-1.03A310771030800025A), using RS485 protocol PACE_MODBUS
  • PACE BMS P16S200A with firmware version 3 (P16S200A-21382-3.00T213822131800670H), using RS485 protocol PACE_MODBUS (#20)
  • Gobel Power GP-SR1-LF280-RN150 51.2V 280Ah, PACE BMS S16A150 (JLD-BMS-S16A150), using RS485 protocol ModbusC1636
  • Joyvoit Suns Energy Battery JVBW5KW, PACE BMS P16S100A (P16S100A-21468-1.00), using RS485 protocol PACE_MODBUS (#19)
  • Orient Power Wall Mounted Battery 48V100AH, PACE BMS P16S100A-21236-2.01 (#31)
  • SOK 100Ah 48V Server Rack Berry, PACE BMS P16S100A (P16S100A-1B470-4.07), using RS485 protocol PACE_MODBUS (#35)
  • SOK 100Ah 48V Server Rack Berry, PACE BMS P16S100A (P16S100A-1B470-4.00), using RS485 protocol PACE_MODBUS (#38)
  • MeritSun / i-finity LFP 200 - 48V (Modbus must be enabled by pbmstool.exe) (#29)
  • Revov R100 51.2V 100Ah, PACE BMS P16S100A (P16S100A-12720-4.05G), using RS485 protocol SRNE (#39)
  • NPP 51.2v 280AH FLCD-30048 NSFG280F10/DS, PACE BMS P16S200A (P16S200A-21452-2.02) using RS485 protocol PACE_MODBUS (#60)

Untested devices

  • Jakiper/BSLBATT 100Ah, PACE BMS P16S100A
  • LIONTRON LiFePO4 LX48-100, 48V 100Ah
  • Shenzen Delong 24V 100Ah, PACE BMS P16S200A-PC1547
  • Hubble Lithium (AM2, AM4)
  • Revov R9
  • Greenrich U-P5000

Schematics

                  RS485                      UART
┌────────────┐              ┌──────────┐                ┌─────────┐
│            │              │          │<----- RX ----->│         │
│    PACE    │<-----B- ---->│  RS485   │<----- TX ----->│ ESP32/  │
│    BMS     │<---- A+ ---->│  to TTL  │<----- GND ---->│ ESP8266 │
│            │<--- GND ---->│  module  │<----- 3.3V --->│         │<-- VCC
│            │              │          │                │         │<-- GND
└────────────┘              └──────────┘                └─────────┘

Please make sure to power the RS485 module with 3.3V because it affects the TTL (transistor-transistor logic) voltage between RS485 module and ESP.

RJ45 jack

Pin Purpose RS485-to-TTL pin Color T-568B
1 B- B- Orange-White
2 A+ A+ Orange
3 GND GND Green-White
4 NC
5 NC
6 GND
7 A+
8 B-

Please be aware of the different RJ45 pinout colors (T-568A vs. T-568B).

BMS address

Module address BMS Module ID Dip1 Dip2 Dip3 Dip4
0x00 0 off off off off
0x01 1 on off off off
0x02 2 off on off off
0x03 3 on on off off
0x04 4 off off on off
0x05 5 on off on off
0x06 6 off on on off
0x07 7 on on on off
0x08 8 off off off on
0x09 9 on off off on
0x0A 10 off on off on
0x0B 11 on on off on
0x0C 12 off off on on
0x0D 13 on off on on
0x0E 14 off on on on
0x0F 15 on on on on

Requirements

Installation

Use the esp32-example.yaml as proof of concept:

# Install esphome
pip3 install esphome

# Clone this project
git clone https://github.com/syssi/esphome-pace-bms.git
cd esphome-pace-bms

# Create a secrets.yaml containing some setup specific secrets
cat > secrets.yaml <<EOF
wifi_ssid: MY_WIFI_SSID
wifi_password: MY_WIFI_PASSWORD

mqtt_host: MY_MQTT_HOST
mqtt_username: MY_MQTT_USERNAME
mqtt_password: MY_MQTT_PASSWORD
EOF

# Validate the configuration, create a binary, upload it, and start logs
# If you use a esp8266 run the esp8266-examle.yaml
esphome run esp32-example.yaml

Example response all sensors enabled

TBD.

Known issues and limitations

None.

Protocol

See docs/PACE-BMS-Modbus-Protocol-for-RS485-V1.3-20170627.pdf.

The protocol is Modbus RTU via RS485.

Addr Description Len R/W Type Unit
0 Current 2 R int16 10mA
1 Voltage of pack 2 R uint16 10mV
2 State of charge 2 R uint8 % 0~100%
3 SOH 2 R uint8 % 0~100%
4 Remain capacity 2 R uint16 10mAH
5 Full capacity 2 R uint16 10mAH
6 Design capacity 2 R uint16 10mAH
7 Charging cycles count 2 R uint16
9 Warning flag 2 R uint16 Hex See ^1
10 Protection flag 2 R uint16 Hex See ^2
11 Status/Fault flag 2 R uint16 Hex See ^3
12 Balance status 2 R uint16 Hex
15 Cell voltage 1 2 R uint16 mV
16 Cell voltage 2 2 R uint16 mV
17 Cell voltage 3 2 R uint16 mV
18 Cell voltage 4 2 R uint16 mV
19 Cell voltage 5 2 R uint16 mV
20 Cell voltage 6 2 R uint16 mV
21 Cell voltage 7 2 R uint16 mV
22 Cell voltage 8 2 R uint16 mV
23 Cell voltage 9 2 R uint16 mV
24 Cell voltage 10 2 R uint16 mV
25 Cell voltage 11 2 R uint16 mV
26 Cell voltage 12 2 R uint16 mV
27 Cell voltage 13 2 R uint16 mV
28 Cell voltage 14 2 R uint16 mV
29 Cell voltage 15 2 R uint16 mV
30 Cell voltage 16 2 R uint16 mV
31 Battery temperature 1 2 R int16 0.1 ℃
32 Battery temperature 2 2 R int16 0.1 ℃
33 Battery temperature 3 2 R int16 0.1 ℃
34 Battery temperature 4 2 R int16 0.1 ℃
35 MOSFET temperature 2 R int16 0.1 ℃ or invalid
36 Environment temperature 2 R int16 0.1 ℃ or invalid
60 Pack OV alarm 2 RW uint16 mV
61 Pack OV protection 2 RW uint16 mV
62 Pack OV release protection 2 RW uint16 mV
63 Pack OV protection delay time 2 RW uint8 0.1S 1~255
64 Cell OV alarm 2 RW uint16 mV
65 Cell OV protection 2 RW uint16 mV
66 Cell OV release protection 2 RW uint16 mV
67 Cell OV protection delay time 2 RW uint8 0.1S 1~255
68 Pack UV alarm 2 RW uint16 mV
69 Pack UV protection 2 RW uint16 mV
70 Pack UV release protection 2 RW uint16 mV
71 Pack UV protection delay time 2 RW uint8 0.1S 1~255
72 Cell UV alarm 2 RW uint16 mV
73 Cell UV protection 2 RW uint16 mV
74 Cell UV release protection 2 RW uint16 mV
75 Cell UV protection delay time 2 RW uint8 0.1S 1~255
76 Charging OC alarm 2 RW uint16 A
77 Charging OC protection 2 RW uint16 A
78 Charging OC protection delay time 2 RW uint8 0.1S 1~255
79 Discharging OC alarm 2 RW uint16 A
80 Discharging OC protection 2 RW uint16 A
81 Discharging OC protection delay time 2 RW uint8 0.1S 1~255
82 Discharging OC-2 protection 2 RW uint16 A
83 Discharging OC-2 protection delay time 2 RW uint8 0.025S 1~255
84 Charging OT alarm 2 RW int16 0.1 ℃
85 Charging OT protection 2 RW int16 0.1 ℃
86 Charging OT release protection 2 RW int16 0.1 ℃
87 Discharging OT alarm 2 RW int16 0.1 ℃
88 Discharging OT protection 2 RW int16 0.1 ℃
89 Discharging OT release 2 RW int16 0.1 ℃
90 Charging UT alarm 2 RW int16 0.1 ℃
91 Charging UT protection 2 RW int16 0.1 ℃
92 Charging UT release protection 2 RW int16 0.1 ℃
93 Discharging UT alarm 2 RW int16 0.1 ℃
94 Discharging UT protection 2 RW int16 0.1 ℃
95 Discharging UT release protection 2 RW int16 0.1 ℃
96 MOSFET OT alarm 2 RW int16 0.1 ℃ or invalid parameters in BMS-4820
97 MOSFET OT protection 2 RW int16 0.1 ℃ or invalid parameters in BMS-4820
98 MOSFET OT release protection 2 RW int16 0.1 ℃ or invalid parameters in BMS-4820
99 Environment OT alarm 2 RW int16 0.1 ℃ or invalid parameters in BMS-4820
100 Environment OT protection 2 RW int16 0.1 ℃ or invalid parameters in BMS-4820
101 Environment OT release protection 2 RW int16 0.1 ℃ or invalid parameters in BMS-4820
102 Environment UT alarm 2 RW int16 0.1 ℃ or invalid parameters in BMS-4820
103 Environment UT protection 2 RW int16 0.1 ℃ or invalid parameters in BMS-4820
104 Environment UT release protection 2 RW int16 0.1 ℃ or invalid parameters in BMS-4820
105 Balance start cell voltage 2 RW uint16 mV
106 Balance start delta voltage 2 RW uint16 mV
107 Pack full-charge voltage 2 RW uint16 mV
108 Pack full-charge current 2 RW uint16 mA
109 Cell sleep voltage 2 RW uint16 mV
110 Cell sleep delay time 2 RW uint16 min
111 Short circuit protect delay time 2 RW uint8 25uS Max 500uS
112 SOC alarm threshold 2 RW uint8 % 0~100%
113 Charging OC-2 protection 2 RW uint16 A
114 Charging OC-2 protection delay time 2 RW uint8 0.025S 1~255
150 Version information 20 R uint16 ASCII
160 Model SN 20 RW uint16 ASCII BMS Manufacturer
170 PACK SN 20 RW uint16 ASCII PACK Manufacturer

Known issues

None.

Debugging

If this example doesn't work out of the box for your device please update your configuration to enable the debug output of the UART component and increase the log level to the see outgoing and incoming serial traffic:

logger:
  level: DEBUG
  # Don't write log messages to UART0 (GPIO1/GPIO3) if the BMS is connected to GPIO1/GPIO3
  baud_rate: 0

uart:
  - id: uart_0
    baud_rate: 9600
    tx_pin: ${tx_pin}
    rx_pin: ${rx_pin}
    debug:
      direction: BOTH
      dummy_receiver: false

References