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48 volt system

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Old Apr 15, 2020 | 08:33 AM
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tanqueGLE20's Avatar
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GLE Exclusive 2020
48 volt system

Can anyone explain to me how to maintain the 48 volt system when the vehicle is stored for a period of time. I understand that we can maintain the 12 volt system with a trickle charger, but the starter is linked to the 48 volt system. How long can this system go without charging. As I understand it gets charged like the F1 car when braking, so if the car is parked for a month or two what happens? Any info would be appreciated, hoping this isn't the achiles heel of the car.
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Old Apr 15, 2020 | 09:03 AM
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Since there is little incidental power draw on the larger Lithium battery it should last a long time with enough juice to start the car. Other Lithium power tools I have seem to maintain the charge better than NMH batteries. I’m pretty sure that the Lithium also charges from the engine Alternator while driving so it might get help from a trickle charger to the 12 volt battery.
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Old Apr 15, 2020 | 01:19 PM
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2020 Mercedes GLE350 4Matic; 2023 Tesla Model Y
Originally Posted by tanqueGLE20
Can anyone explain to me how to maintain the 48 volt system when the vehicle is stored for a period of time. I understand that we can maintain the 12 volt system with a trickle charger, but the starter is linked to the 48 volt system. How long can this system go without charging. As I understand it gets charged like the F1 car when braking, so if the car is parked for a month or two what happens? Any info would be appreciated, hoping this isn't the achiles heel of the car.
See page 195-196 of the 2020 GLE owner's manual. There is a stand by mode to protect the battery (I think it applies to both 12V and 48V) if the vehicle will not be started for 6 weeks.

Activating/deactivating standby mode (parking the vehicle for an extended period)
Requirements:
- The engine is switched off.

Multimedia system:
Home --> Settings --> Vehicle
- Switch Standby Mode on or off. When you activate the function, a prompt appears.
- Select Yes. Standby mode is activated.

Last edited by TexAg91; Apr 15, 2020 at 01:23 PM.
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Old Apr 15, 2020 | 01:23 PM
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2020 GLE 450; 2023 BMW M2 Coupe
Maintaining 48V battery

Originally Posted by tanqueGLE20
Can anyone explain to me how to maintain the 48 volt system when the vehicle is stored for a period of time. I understand that we can maintain the 12 volt system with a trickle charger, but the starter is linked to the 48 volt system. How long can this system go without charging. As I understand it gets charged like the F1 car when braking, so if the car is parked for a month or two what happens? Any info would be appreciated, hoping this isn't the achiles heel of the car.
The main source of charge for the 48V battery is the Integrated Starter Generator (ISG) sandwiched between the engine and transmission. From what I've read, auto Li-Ion batteries will lose about 5% in the first 24 hours then up to 5% max. per month on non-use. So, theoretically you could not drive it for a year and still have enough charge. It will not completely discharge to protect itself. The 12V battery that runs all the electronics and control systems is a different story, but it can be maintained with a trickle charger or even jump started.
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