Installing the v6 board

Three known problems

• The ZXTR2012Z voltage regulator cannot handle the battery voltage suddenly appearing on its input without an external current limiting resistor.
  • Any resistor would be fine, I used 1k in a 1206 package.
  • The voltage divider of the sense must be still exposed to the full input voltage!
  • This issue is likely to affect Yamaha boards too!
  • Maybe it would be easier to use a low (10 Ohm?) resistor - if it does not blow, there is no need for the bypass, as the voltage drop would be so small (10 Ohm * 1 mA = 10mV)
• The 3rd pin of the 5-pin signal connector (used on the 'white' BMSs) is not connected to the NTC
  • This is only relevant if the battery has white BMS and 48V.
  • I could replace the NTC w/ a 10k resistor - the BMS has an NTC anyway!
• The LED indicator cable is too short to reach the connector
  • The board must be placed upside down!

Further observations

• There is very little space. The idea of a plastic holder to keep everything organised may be flawed - there is just no space for it?
• Especially with the 48V large BMS.
• It would be very helpful to find a method to get 'just long enough' sense wire harness.
• I could make the board at least 5 mm narrower - it would further help with wires!
• The RST pins should be smaller, like the selector
• The power should be from a connector too! Less clumsy that way, less chance of breaking the board
  • Shrouded connector, 1.25 to 2.5 mm pitch, 2 poles - like TE HPI or JST ZH or ZX or PH
• OR I shall have two terminals for both - so you don't need to 'split' the wires and mess with heatshrink
  • But then I need a bit more space
• One mounting screw hole is more than enough
• Downwards pointing connectors could save further space!
  • And make placement less critical - shorter distance for wires

On a 48V white BMS battery

On a 36V green L-shaped BMS battery