ESP32 Arduino firmware to monitor Jbd Battery Management Systems and eSmart3 chargers. Sends status to an Influx db with the Joba_JbdBms and Joba_ESmart3 libraries. Status is also sent to an mqtt broker. Switching eSmart3 load and JbdBms mosfets on and off via web page is also possible. For now, battery parameters for LiFePO are always set at startup.

Running the monitor on an ESP8266 might work but is not tested.

There are many options to compile and install an ESP32 Arduino firmware. I use this one on linux:

• Install MS Code
• Install PlatformIO as MS Code extension
• Add this folder to the MS Code workspace
• Edit platformio.ini in this folder so the usb device name for monitor and upload matches your environment
• Select build and upload the firmware

See library readmes for wiring details.

Required hardware:

• A MAX485 board (or similar) to convert RS485 signals to serial.
• A level shifter from 5V to 3.3V (at least 3 channels) if the MAX485 board does not already have one
• An ESP32 (with USB connection or an additional serial-to-USB adapter for flashing)
• Cable with one RJ45 plug and just wires on the other end. 1-8: A-, B+, nc, nc, Gnd, Gnd, 5V, 5V
• eSmart3 MPPT charge controller
• JBD BMS like SP04S010A
• LiFePO battery, PV (or >16V power supply for testing)

 RJ45 plug
for eSmart3
     __
  __/__\__
  |front |
  ||||||||
  1 ...  8
  ABxx--++

Relevant connection data (Influx host, database, ...) is configured in platformio.ini Create necessary database like this on the influx server: influx --execute 'create database LiFePO_Island'

• checks eSmart3 Information every 10 minutes
• checks eSmart3 ChgSts every half second
• checks eSmart3 BatParam, LoadParam, ProParam every minute
• checks eSmart Log(wStartCnt, wFaultCnt, dwTotalEng, dwLoadTotalEng, wBacklightTime, bSwitchEnable) every minute
• checks JbdBms Hardware every 10 minutes
• checks JbdBms Cells every 10 seconds
• checks JbdBms Status every 10 seconds
• updates database at startup and on changes

job4:~ > influx -precision rfc3339 --database LiFePO_Island --execute 'show measurements'
name: measurements
name
----
BatParam
Cells
ChgSts
Hardware
Information
LoadParam
Log
Parameters
ProParam
Status

job4:~ > influx -precision rfc3339 --database LiFePO_Island --execute 'select * from Cells limit 5'
name: Cells
time                 Host            Id                      Version voltage1 voltage2 voltage3 voltage4
----                 ----            --                      ------- -------- -------- -------- --------
2022-11-01T09:49:39Z lifepo_island-1 JBD-SP04S010A-L4S-35A-B 1.0     3360     3356     3356     3355
2022-11-01T09:49:45Z lifepo_island-1 JBD-SP04S010A-L4S-35A-B 1.0     3360     3357     3356     3356
2022-11-01T09:49:52Z lifepo_island-1 JBD-SP04S010A-L4S-35A-B 1.0     3360     3356     3356     3356
2022-11-01T09:49:58Z lifepo_island-1 JBD-SP04S010A-L4S-35A-B 1.0     3361     3357     3356     3356
2022-11-01T09:50:05Z lifepo_island-1 JBD-SP04S010A-L4S-35A-B 1.0     3361     3356     3356     3356

since WiFi is needed for Influx anyways, it is used for other stuff as well:

• Webserver
  • display links for JSON of all eSmart3 item categories and JbdBms commands
  • enables OTA firmware update
  • later: display and change some values of BatParam, LoadParam, ProParam and Log
• Syslog and mqtt publish of status on changes
  • mqtt topic LiFePO_Island/{instance}/json/# for publishing eSmart3 or JBD infos in json format
  • mqtt topic LiFePO_Island/{instance}/status/# for publishing esmart3 or jbd fault status
  • mqtt topic LiFePO_Island/{instance}/cmd for receiving commands:
    • "load on": switch eSmart3 load on
    • "load off": switch eSmart3 load off
• NTP to set eSmart3 time at startup once
• RSSI and BSSID monitoring to find a place with good WLAN signal reception for the ESP32

Comments welcome

Joachim Banzhaf