Alternator producing 30 amps/idle - load 50 amps...

[Elektri]

More amps at idle possible?
-Smaller alternator pulley?
-Larger than 80 amp alternator?

89 420 SEL...

I've noticed my alternator only puts out 30 amps when at idle (around 600 rpm).

Yet if it is cold and nighttime... Headlights on, rear window defrost on, heater on full blast, etc., then the load on the electrical system is 50 amps! (Higher engine rpms will produce 80 amps.)

I've read of higher amperage alternators for other models of Mercedes (100 amp) which will fit a W126 car. Anyone know if those put out more amps at idle than the 80 amp alternator?

Or is a smaller alternator pulley available (which would turn faster at slower rpms)?

Other solutions? (Move to Florida and roll down the windows? )

Or maybe not a problem and that is why there is such a large battery on these cars - runs off that at traffic signals?