Comparison Between WatchMon 4 and WatchMonPlus

Have a read about the difference between WatchMon 4 ( Decentralised) and WatchMonPlus (Centralised) supervisors and a comparison on their performance.

WatchMonPlus is a Centralised BMS as it has on board cell monitoring

WatchMon4 is Decentralised using a variety of different cell monitors to suit different batteries.  

Video:

Metrics

This article will help outline the differences and help determine the correct supervisor series for your project. 
  • Watchmon 4
  • WatchMonPlus (WatchMon 5 WM5)
  • WatchMonPlus (WM7)

Power Comparison Chart

Balancing Power
Peak Continuous Daily 24h
WatchMon4 & LongMon  2.2A 1.2A 28.8 Ah
WatchMonPlus (WM5)  0.5A 0.3A 6.0 Ah
WatchMonPlus (WM7) 0.5A 0.3A 6.0 Ah
NOTE:  WatchMon 5 is now WatchMonPlus.  WM5 is 10s-15s (48V nominal) and WM7 is 6s-10s (24V nominal)

Typically, the daily balancing requirement is between 100mAh and 1000mAh. This will depend on the cell age, chemistry and configuration. Balancing power beyond this level is useful to have in reserve for the initial balance and any minor fault or reconfiguration event.

Typically Automated Initial Commissioning Comparison

NOTE:  WatchMon 5 is now WatchMonPlus. WM5 is 10s-15s (48V nominal) and WM7 is 6s-10s (24V nominal).  WM7 has the same balancing capacity as WM5

For those wanting to assemble new cells without any conditioning process into packs, this table compares the options to avoid any manual balancing steps. New cells vary between 40 - 70% SoC% when supplied,  hence assume a 30% variance for the initial balance. After this initial event there is very little need for this level of power unless the battery pack is reconfigured. N/A is listed for scenarios beyond two(2) weeks which will needing additional assistance.

Recovery or Worst Case Commissioning Comparison

NOTE:  WatchMon 5 is now WatchMonPlus. WM5 is 10s-15s (48V nominal) and WM7 is 6s-10s (24V nominal). WM7 has the same balancing capacity as WM5

The table above demonstrates the worst case scenario of a battery pack with almost all cells full and one replaced that is empty (or the reverse scenario). Hence the need to balance the full battery capacity, whilst this should not occur it can occur when recovering a battery pack with a significant variance.  

WatchMon4 + Longmon

  • Supervisor with distributed cell monitors
  • Flexible Voltage depending on number of cell monitors used
  • 2.2A max 1.2A typical bypass balancing
  • 28.8Ah per day for each cell
  • Not recommended for use with OEM shared cell balancing looms
  • Available now

WatchMonPlus (WatchMon5)

  • Supervisor with cell management (from 10 to 15 series cells)
  • Nominally 48V with most Lithium batteries
  • 500mA bypass balancing
  • 6Ah per day for each cell
  • Compatible with many of the OEM shared cell balancing looms
  • Available now to beta customers

WatchMonPlus (WatchMon7)

  • Supervisor with cell management (from 6 to 10 series cells)
  • Nominally 24V with most Lithium batteries
  • 500mA bypass balancing
  • 6Ah per day for each cell
  • Compatible with many of the OEM shared cell balancing looms
  • Available now to preorder - expected Nov. 2019

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