Quote:
Originally Posted by Rival
ive been reading about F10 battery charging issues all afternoon.
One post ive found intertesting
"It charges up to 80% using the alternator, the last 20% is charged using the regenerative breaking..if battery charge drops below 80% the alternator kicks in.. however BMW used a bigger battery and designed the car to fully function with 80% battery charge and thus even if you idle and drive short trips only the 80% would be more than sufficient to maintain a healthy battery and electric system."
Cant believe the battery is this big of an issue. Ive had 3 e90's, only put a new battery into the 06.
All the online links are dealer or BMW type sites, i just needed to get a PN for my mechanic. After he has a PN, hes GTG
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There is no "regenerative braking".
When coded for an AGM battery, the vehicle systems will target a system voltage of 14.8VDC at all times to rapidly recharge the battery until it's SoC is >=80%. At that time the system voltage will be reduced to this high 13s VDC and only go to 14.8VDC when coasting (and the EfficientDynamics blue bar is illuminated). This is meant to reduce the charging system (alternator) effect on fuel economy.
It's mostly marketing, but it's important to understand how it works. There is absolutely no regenerative braking as it's defined in hybrid vehicles. It's just the alternator and the computers alter the system voltage to attempt to increase fuel economy. That's it.