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Originally Posted by Jaime
Be careful. In most cases, idling doesn't generate enough power in the alternator and instead of recharging the battery, you'll be draining it (lights are always on, at least in my GZ).
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Yes, that's the point, really.
Even at full output, when you consider the headlight and front "running lights" of the recent models, there just isn't much left to top up the battery.
Some but not much.
To fully recharge a 25 AH battery, one needs to send 25 amps to it for 1 hour (not really a good idea even if you could do it) OR one amp for 25 hours OR something in between that adds up to 25. I think the on-board system is closer to 1 amp for 25 hours but that is just a guess.