Quote:
Originally Posted by Ron07x5
It will be interesting if I discover x5 would become more and more discharged. There.is no question the alternator can charge the question when and if the computer software has the alternator charge. I believe.the software.design seems to minimize alternator use.to then improve epa gas mileage. But this is problematic if the x5 is used lightly?
We shall find out!
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The system will only disengage the alternator under acceleration if the battery charge level is relatively high in the first place, if its low it will charge all the time. This cut off point is, IMHO, set to low and if the battery is older, or conditions arduous such as low temperatures, short runs or high demand, the battery can become discharged.
I used to find in the winter, running my remote diesel cabin heater could render the car unable to start, even though the heater is supposed to cut out if it detects low battery voltage or low fuel.
If I could I would code this function off as I think it's value to economy is pretty much zero and it's there just so BMW can claim to use wasted breaking energy. I have not been able to discover how to code it off or recalibrate it.
My solution has been to fit a 110ah battery and recode the car to suit. This has solved my problems and I now don't need to use a mains charger at all.
I stress this has worked for me in my particular usage patterns and may not be the answer for others.