BMS_JK-B_RS485_DISPLAY_solution.md

YamBMS - JK-B BMS RS485 DISPLAY Solution

External component

esphome-jk-bms by @syssi

Schematic and setup instructions

Caution

The jk_bms_display component does not provide all the information needed for an optimal operation of YamBMS. The missing information has been added in the code by fixed values. e.g. it's not possible to know if the BMS is online or if the BMS is equalizing the cells.

JK-B2A8S20P

│                   JK-B2A8S20P                   │
│                                                 │
│   Temp    CAN    GPS     Display    Balancer    │
└──[oooo]──[ooo]──[oooo]──[oooooo]──[oooooooooo]──┘
                           ││││││
                           │││││└─ K-
                           ││││└── K+
                           │││└─── GND ( not common with B- , isolated ? )
                           ││└──── B
                           │└───── A
                           └────── VCC = +/- 11.5V

JK-BD6A2xS10P and JK-BxA24SxxP

│           JK-BD6A2xS10P, JK-BxA24SxxP           │
│                                                 │
│     CAN   GPS      Display     Heat             │
└────[ooo]─[oooo]───[oooooo]───[ooooooo]──────────┘
                     ││││││
                     │││││└─ VCC       ┌───────────────┐        ┌─────────────────┐
                     ││││└── A ────────│A+          GND│────────│GND              │
                     │││└─── B ────────│B-  RS485   RXD│────────│RX    ESP32/     │
                     ││└──── GND       │    to TTL  TXD│        │TX    ESP8266 GND│──────
                     │└───── K+        │    module  VCC│────────│5V            VCC│──────
                     └────── K-        └───────────────┘        └─────────────────┘

Power Button

K-   o-------[ 100kΩ ]-----o  /
                             /---|
K+   o---------------------o/