Interesting. I do have a jump pack and that usually does the trick. I’ve got a voyageur on it now so I can monitor voltage a lot closer and accurately now.
What’s using so much power on idle that the obviously pos stator can’t even keep up after 2-4 minutes of idiling?? That’s pretty pathetic is it not?
It has been repeated many times that even on motor vehicles, the amount of amps at idle are so low that alternators are not considered chargers and are meant to maintain a battery and that is about it. Never mind stators, like one had mentioned that only put out a minimum of amps, at best, to keep the amount level. Couple that with the time that the bike ends up getting cold again and all that warm up has done is, nothing. All it did was maybe keep the battery the same volts/amps it had before it was ever started but then the bike and battery are dead cold again.
The only thing that might help would be if you increased the idle to feed the battery more amps otherwise one is really just wasting fuel.
Some bikes have such small batteries that after a few minutes of leaving the key on, not running, the battery is dead. These are not auto batteries or boat batteries with a huge reserve capacities, these are batteries the size of a 64 box of Crayola Crayons.
If it were me, I'd just charge the battery the night before. Not start it until I got to where I was going, but put a jump pack on the battery before the first start of the day. Otherwise, after a 20 minute ride, everything is cold again and it is like you did nothing at all with all the previous starts.