Here’s a look at something new – no belts (or pulleys) driving accessories, including the water pump. Everything driven electrically – by a 48 volt electrical system. The 2020 Mercedes GLE is among the first to come with this much more powerful electrical system and the main reason why has more to to do with ASS (automated stop/start) than anything else.
ASS is becoming unavoidable in new cars, because it’s a “field expedient” way for the car manufacturers to achieve compliance with Uncle’s fuel-efficiency fatwas. Shutting off the engine as much as possible is a a way to”save gas” – without further downsizing or de-powering the engine.
But 12V systems – especially the 12V starter battery – just haven’t got enough juice to deal with the restarting the engine potentially dozens of times a day instead of just a couple of times. It taxes the battery – and so shortens its life.
It’s also hard to get a smooth/quiet re-start without an extremely powerful/fast starter motor – and that requires more juice.
Four times as much juice, apparently.
. . .
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