TL/DR:
Apparently the HV battery will fully power the car if/when the 12v battery fails?
Software: 2021.4.18.2
This afternoon I wanted to see how much current the car needed to “turn on” the car in the event my 12v battery failed.
I have a really old car battery charger that has two charging settings: 2 amps & 10 amps. I disconnected the 12v battery and let the car go to sleep. About a half hour later, I went out and opened the door and expected nothing to happen (which is what I’ve read happens when the 12v battery completely fails). Then I was going to hook up the charger and see if the 2 amp setting would let the car wake up & close the HV disconnect- then the 10 amp if it didn’t work.
Surprisingly, the car woke up as normal, but with two warnings:
VCFRONT_a192
“Electrical system power reduced. Non essential features may be unavailable.”
VCFRONT_a402
“Electrical system backup power is unavailable. Vehicle will consume more energy while idle.”
Reading through the manual, it clearly states that the HV battery will now power the car while the vehicle is idle.
Is this new?
I did initially get a warning that the 12v battery was disconnected. Not sure if the system differentiates between a failing/failed battery or a disconnected battery, but this was not what I expected to see. I expected the car to just be dead, but nope.
There was a post a few days ago where someone used a backup power source to power up the car and continue on their trip when their battery died. Any idea why their HV battery didn’t take over? Maybe a 12v failure while the car is asleep is different than a battery that is completely disconnected? Or if it fails while the car is still awake, it “knows” about it and can act accordingly?
12V Battery died this weekend
Apparently the HV battery will fully power the car if/when the 12v battery fails?
Software: 2021.4.18.2
This afternoon I wanted to see how much current the car needed to “turn on” the car in the event my 12v battery failed.
I have a really old car battery charger that has two charging settings: 2 amps & 10 amps. I disconnected the 12v battery and let the car go to sleep. About a half hour later, I went out and opened the door and expected nothing to happen (which is what I’ve read happens when the 12v battery completely fails). Then I was going to hook up the charger and see if the 2 amp setting would let the car wake up & close the HV disconnect- then the 10 amp if it didn’t work.
Surprisingly, the car woke up as normal, but with two warnings:
VCFRONT_a192
“Electrical system power reduced. Non essential features may be unavailable.”
VCFRONT_a402
“Electrical system backup power is unavailable. Vehicle will consume more energy while idle.”
Reading through the manual, it clearly states that the HV battery will now power the car while the vehicle is idle.
Is this new?
I did initially get a warning that the 12v battery was disconnected. Not sure if the system differentiates between a failing/failed battery or a disconnected battery, but this was not what I expected to see. I expected the car to just be dead, but nope.
There was a post a few days ago where someone used a backup power source to power up the car and continue on their trip when their battery died. Any idea why their HV battery didn’t take over? Maybe a 12v failure while the car is asleep is different than a battery that is completely disconnected? Or if it fails while the car is still awake, it “knows” about it and can act accordingly?
12V Battery died this weekend