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Old 01-21-2013, 07:00 PM   #590
Beastly Adventurer
Joined: Oct 2008
Location: Sydney, Australia
Oddometer: 2,741
The lower output referred to earlier in the thread is a reference only to the stated maximum ratings of the particular model of VR and the possibility of overloading it on the F800. Overall a good series VR will provide more of the stator output to the machine than a shunt VR

In general terms the series VR open circuits the stator in the process of regulating and a shunt VR short circuits the stator to ground hence the shunt regulator applies a constant load to the stator and this increases stator temperature

The other benefit of a series VR is the lower engine load it creates and so a very small increase in usable engine power can result. BMW are using slightly different techniques on the cars to reduce fuel consumption and increase engine response by "disconnecting" the alternator output under constant throttle and acceleration. They have called it "regenerative charging" which is only slightly misleading
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