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- Jun 13, 2022
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- Driving
- MG4 Trophy LR
EVs can drain the 12V battery much faster due to:
If the main battery is not charging the 12V battery enough (or at all), then it can discharge.
It's a silly weak point that everyone (including Tesla) has encountered and we should have a redundant 12V design so the worst that happens is you get a partial failure and need to charge up or replace that, but the car is always usable.
Here's one of the components needed alongside two 12V batteries. It can be done.
- Smaller capacity 12V batteries.
- Powering various electronics on the car (standby draws).
- Bugs / faults where components get stuck in a power-sapping loop.
- External USB/OBD2 devices plugged into the car.
If the main battery is not charging the 12V battery enough (or at all), then it can discharge.
It's a silly weak point that everyone (including Tesla) has encountered and we should have a redundant 12V design so the worst that happens is you get a partial failure and need to charge up or replace that, but the car is always usable.
Here's one of the components needed alongside two 12V batteries. It can be done.