« Reply #8 on: April 26, 2020, 09:46:08 AM »
Idle rpms are not conducive to sufficient charging voltage.
And certainly not if it just for a few minutes. I only drive my car to work when it is rainy (otherwise I bicycle). So my car will sit for several days unused, then maybe driven to work or the store a few times. Both trips are very short. It never can recover from being started and eventually the battery will die if I don't either take a 30 min trip, or put a charger on the battery.
The bike at idle pulls considerable power- the fuel injection, the ignition, the ECUs, dash/tail lights, and the headlights. I am not sure the alternator, in such a case, is at a net negative, but I would guess it is probably not much above what is being used.
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