Quantifying overnight ("phantom") drain

[Knucklehead]

It's not telling you the power it's using. That's bad, Gir.

-Crissa

That is true, but the vehicle reports an efficiency reading and I know the range I am getting. I don't think recharging the LVB while driving or charging is significantly impacting either.

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[HaulingAss]

Due to a recent illness, my Cybertruck was parked in my driveway, outside in the sun, with Cabin Overheat Protection on for a full week. It wasn't plugged in at all and it only lost 3% over the seven days. I also had Phone as Key on and checked it a couple of times with the app through the week. That's pretty good considering it kept the interior temps below the 105F I set it to.

Had I turned off Cabin Overheat Protection and Phone as Key, and stopped waking it up, it would have lost practically nothing.

This is a big nothing burger if you know how to turn off the ancillary services you don't need. My ICE F-150 doesn't even have those features and it can only go about a month without needing a jumpstart. My Cybertruck would go at least three months.

 

[Woodrick]

Not really. The HVB is not losing charge. The LVB is instead. Not sure why that is considered lying. The LVB is very small and easy to recharge. In fact, it is a AGM battery that is smaller than those typically used on a ICEV.

As you know, there is a lot of overhead associated with accessing the HVB. The BMS needs to manage the HVB and there is a lot of energy lost even if you just need 10 Watts from the HVB.

Anyway, I think it is a big problem. I think Tesla will solve it, but it needs a solution. And the legacy car companies prove there are solutions that work.

You need to be careful talking about things that you really aren't sure of.

It's not an AGM battery. It's a Lithium Ion in the Cybertruck and most, if not all newer Teslas.

And because it isn't a 12V battery, Tesla refers to it as the MV Battery.

And absolutely the traction battery loses power when it charges the MV battery. It's not perpetual motion.

 

[CyberGus]

You need to be careful talking about things that you really aren't sure of.

You're very judgy.

I'm pretty sure Mr. Head was referring to a different EV:

My Mach-e has Phone as a Key...

 

[Woodrick]

That is true, but the vehicle reports an efficiency reading and I know the range I am getting. I don't think recharging the LVB while driving or charging is significantly impacting either.

None of it is significant, until it is.

You're very judgy.

I'm pretty sure Mr. Head was referring to a different EV:

You are correct, his subject may have drifted to the Mustang.

 

[CyberGus]

That is true, but the vehicle reports an efficiency reading and I know the range I am getting. I don't think recharging the LVB while driving or charging is significantly impacting either.

I'm sure no one is claiming "zero" loss over time, even a battery on a shelf will slowly lose power.

Radio receivers can be optimized to sip milliwatts of power, which falls under the category of "negligible". Clearly, Teslas (particularly Cybertrucks) are doing "other things?" when idle, since the loss is measurable.

 

[Woodrick]

I'm sure no one is claiming "zero" loss over time, even a battery on a shelf will slowly lose power.

Radio receivers can be optimized to sip milliwatts of power, which falls under the category of "negligible". Clearly, Teslas (particularly Cybertrucks) are doing "other things?" when idle, since the loss is measurable.

The ICE folks certainly believe that it is zero.

 

[Knucklehead]

None of it is significant, until it is.


You are correct, his subject may have drifted to the Mustang.

It didn't really "drift". I was answering questions about my Mach-e which absolutely does have a 12V AGM battery.

My Mach-e demonstrates you don't have to drain the HVB to enable various functions. As I previously posted, Sentry mode is different, but if that is turned off, I don't see why there needs to be any range loss when parked.

 

[Knucklehead]

You're very judgy.

I'm pretty sure Mr. Head was referring to a different EV:

Mr. Head. ???

You can also call me Mike.

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