Has anyone posted a charging curve for the i4 yet? | BMW i4 Forum
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Has anyone posted a charging curve for the i4 yet?

11K views 14 replies 8 participants last post by  evnl  
#1 ·
Seeing that the i4 is now being delivered in Europe, has anyone done a detail charging curve for the battery? Knowing this info will give you an idea of how long you will be at charging stations when doing a long drive. If it charges slow at say 70% state of charge (SOC) it would be better to leave the station then instead of waiting to get to 80% as an example.
 
#2 ·
As I could see on some videos of Italian youtubers, it seems that the charging power remains stable up to 80% (Ionity charging points), not always at maximum power (200 kw): an average of 130-150 kw. But there are no graphics yet.
 
#4 ·
Very interesting ! I would like to know how much these values can vary according to different suppliers and charging conditions...
 
#5 ·
Is it true too much fast charging will degrade the battery? Also, does anyone know the optimal charging routine? Is it just to keep the battery between 20 and 80%?
 
#7 ·
Fast charging will degrade the battery somewhat during the lifetime of the battery, but most people do most of their charging at home on a Level 2 (much slower) charger which doesn't hurt the battery as much. Its ok to use a DC Fast Charger, but not every day. And keeping the battery between 20-80% is the best way to treat your battery.
 
#6 ·
Looking at the charging curve, it looks like if you are on a long trip you should DCFC up to 60-70% then leave to head to the next charging station to maximize your trip speed. This is pretty good and may even improve with software updates.
 
#8 ·
Looking at the charging curve, it looks like if you are on a long trip you should DCFC up to 60-70% then leave to head to the next charging station to maximize your trip speed.
I have not done any true long range drives yet, but from my feeling so far, the trip speed is not as important as trip comfort. If you stress about every minute and percent and then at the end of a full day driving arrive with your nerves shot, but 20 minutes earlier, that is IMHO not a worthwhile trade. So the optimal charging strategy for long trips would involve planning non-charging activities to coincide with the charging time - food, bathroom breaks, stretching, minor sight seeing. This way wast majority of charging time will become invisible and there is no worry if you spent a bit longer at your lunch table and charged up to 90% instead of 60%.
 
#14 ·
I drove about 2,000 miles with my M50 and only have 2.9 miles let kW since Factory. Probably need to start driving normally and stop showing off the launch control to friends. However considering that I mostly drove 80mph on highways the 2.9 miles per kW is not bad. The Volvo had 2.4 miles per kW.