Watchmon4 hardware guide and pin assignment

BMS central processor for watching cell monitoring units and provides supervision functions. The WatchMon4 supervisor is able to notify remote systems (inverter/charger) of the battery state and when required trigger evasive action to prevent damage to battery pack.

Remote Communication

  • WiFi connectivity (normal, disabled, or read only)
  • Can-Bus communication port to remote systems
  • Modbus rs485 link allowing connectivity to inverters without canbus
  • optional blue-tooth connectivity (future enhancement)

Built-in input and output control

  • two (2) onboard FET outputs 4A with 8A inrush 
    • e.g. remote circuit breaker trip + fan
  • two (2) onboard input
    • e.g. circuit breaker trip sensor

Added features and I/O with Expansion board 

  • 5 Digital inputs
  • 2 Analogue inputs
  • 1 Pulse counter input
  • 8 Digital outputs  (4 FET + 4 Relay)
  • 2 Digital output PWM
  • NeoPixel LED control

Power Input

  • Built-in 8v to 65v DC-DC supply
  • handle automotive transients
Processor
  • ESP32 more powerful than WM1
  • Data logging of key metrics for 10 years
  • Clock with backup battery
  • optional over the air (OTA) upgrades to firmware
  • upgrades firmware via USB
  • secure web encryption to allow SSL link when connecting to optional cloud portal via MQTT.
  • prevent all outputs from resetting when the processor firmware is updating (no transient on/off/on)

BMS Module Connectivity

  • serial link to SoC% current sensor module
  • serial link to isolated CellMon modules 

Ease of Use

  • pluggable screw terminals to simplify installation, allowing pre-made cables for both shunt and cellmons
  • relocation of onboard temperature sensor away from heat sources to have better representation of ambient conditions
  • finger guard cover clip slots, more coming soon
  • intuitive screw terminal labeling to reduce need to check documentation

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