good question !
Nordle wrote:Will model3 balance cells only when they're hitting max voltage
no, model3 constantly balance and compare cell delta voltage, dynamically adjust its cell release voltage, also provides 3 kind of terminations - TIMER, CELL DELTA, CV CHARGE CURRENT.
Nordle wrote:balance all time?
its depended on customer set CELL DELTA value, when BALANCE CHARGE method is selected WITHOUT charger plug-in, model 3 start CELL BALANCE immediately without charging and terminate when CELL DELTA value reached. model 3 allows customers use QUICK CHARGE, BALANCE CHARGE(with larger cell delta value) with supervisor and BALANCE only during over-night for safety consideration.
QUCK CHARGE terminate when anyone cell reached cell top voltage e.g. 4.25v
Nordle wrote:Can i set max voltage per cell?
yes, model 3 allows 0.5 margin add on top of the preset cell voltage e.g. 4.25v for lipo
Nordle wrote:What will it cost approximately?
we are collecting market information, do you have any ideas ? we are open to discuss it.
we are not expert in battery, we need customers and battery builders's feedback to improve our charging workflow and algorithm, via the firmware upgrade we can keep improve the charge efficiency
little background : most of the market BMS start cell discharge when cell voltage hit the fix OC voltage e.g. 4.2v then disconnect charge circuit, wait until cell reached the fix release voltage e.g. 4.1v then re-connect charge circuit to allow charge current in, the process repeat until end of CV stage (indicated by CV tiny current), sometime when CV charge current > charge preset terminate current value AND = cell discharge current, you never know when the pack is fully charge by the indicator of charger LED.