Offline vehicle after sitting for 9 weeks.

[gogetter]

I brought a model S 90d it’s been parked up for 9 weeks. I got access through the Tesla app recently but it’s showing as offline for the last 7 days.

It’s 700kms from me and I’m trying to help it be transported easily. Would it be normal in 9 weeks for the 12v to go flat? Or has it gone into some sort of sleep mode after sitting for so long. It’s not plugged into a charger. Ideas?

 

[NewbyMaybe]

Charge the 12v or replace it. Slow charge or bypass it if necessary.

 

[hgmichna]

Why should that be necessary? I thought the low-voltage battery is automatically recharged from the big battery.

 

[mswlogo]

Why should that be necessary? I thought the low-voltage battery is automatically recharged from the big battery.

Until the main battery is so low it can’t.

And a tired 12V battery will tend to need more charging.

 

[NewbyMaybe]

The 12v's are a nuisance. Lots of threads here on the issues.

 

[gogetter]

Until the main battery is so low it can’t.

And a tired 12V battery will tend to need more charging.

How low does the main battery go before it stops charging the 12?

 

[NewbyMaybe]

It stops when the computer shuts down after a few minutes when not being used.

 

[mswlogo]

How low does the main battery go before it stops charging the 12?

Don’t know, probably 20% or so or lower. Main battery will protect itself.

 

[vcor]

The main HV battery will maintain the 12v battery down to 0% SOC. Then it will stop charging the 12v battery within 24 hours (and maybe sooner). The 12v battery will typically die within 4-8 hours of when charging stops. Tesla states at 0% SOC the main battery is disconnected and should last 4 months or more before it becomes permanently damaged. Still, this is not good for longevity so it should be avoided.

 

[Lasttoy]

Short of it. Get a charger that puts out 14+ volts to charge 12v battery. It will ok. Then supercharger it.
Make sure the battery is full to 14+ volts before trying to get car alive.

 

[Silicon Desert]

It stops when the computer shuts down after a few minutes when not being used.

Maybe I am misinterpreting your statement. My battery continues to charge (as needed for a few minutes) even when asleep.