I'll have a go at answering your questions but bare in mind I'm just building my first lithium pack with a bms with similar settings so I'm just learning as I go along also. Critical responses welcome.
>Over Voltage: 4.0v
I recommend leaving this setting at stock. If you're vehicle has regen then the voltage may go too high and your bms might cut out. If you want to charge your batteries to 4.0 volts or 4.1 volts to improve the lifespan at the expense of range then do it by changing the voltage of your charger. Stock setting on my bms is 4.25
>Over Voltage Release: 4.0v
The release voltage should be lower than overvoltage, stock on mine is 4.15
>Under Voltage: 3.1v
I'd leave this at stock, or whatever your batteries minimum safe voltage is. Your controller should have a minimum pack voltage where it shuts down the bike anyway. If you want to prolong your battery life by not overdischarging then great but it might be dangerous to have your bms perform this function for you by suddenly cutting your battery while you're on the road. Stock for me is 2.7 volts.
>Under Voltage Release: 3.1v
This should be above the under voltage. Stock for me is 3.0v
>Discharge Overcurrent: 120A
This is an important setting, this could protect your battery from overheating and also in the event of a short circuit in the pack, but it could be dangerous if your bike cuts out on the road. I set this well above your controller current.
>Cycle Capacity: 45AH
I think This is the total capacity of your intended pack, meaning if you only charge to 4.1 volts and discharge to 3v then this capacity will be less than the nominal capacity.
>Nominal capacity.
This is the max capacity of the battery as rated by the spec sheet.
>Open Balance: Open (Open or Closed)
I think open means open circuit voltage, I think this is a better setting than closed. For more info read this thread.
https://endless-sphere.com/forums/viewtopic.php?t=95661
>Balance Mode: Static (Static or Charge)
>Balance Turn-On Voltage: 3.5v
>Balancing Precision: 0.03v
These three settings will determine how your bms balances. 'Charge' is the conservative setting that means your battery will only balance on charge. 'Static' means your bms will try to balance the battery when it isn't charging or discharging. 'Balance turn on voltage' is the voltage the battery will start trying to balance the pack. Some combinations of these settings are bad, for example on the bluetooth battery thread a poor fellow had the balancing voltage set way to low something like 3v with static balancing and the balancing precision also set too very low and when he left the battery over winter it balanced itself to death trough overdischarge.
I'm setting mine at balancing turn on 3.8v and the precision at .01v this means the bms will keep trying to balance the battery but will stop at 3.8v roughly 70% of capacity so I don't think my bms will balance itself to death but I'm going to monitor the balancing anyway to see what happens and if necessary increase the the precision back to .02 or .03v if it doesn't stop balancing.
>Hardware Overcurrent: 500A
>Hardware Short Circuit Protection: 1000A
These settings I don't understand. I have the same settings as you stock. Does it mean that if there is a hardware short-circuit of 950 amps then the bms won't cut out? If so are these setting too high? If anyone else has an idea please say so!
