charge/maintain 12v battery in Rav 4 PHEV ?

[HSDish]

Know that I´ve seen something about this at this forum but I can´t find it.

Does the 12v Battery charge when traction Battery is charged by cable ?

[Catlover]

What do you mean Kenth “when traction Battery is charged by cable” ??

[HSDish]

2 minutes ago, Catlover said:

What do you mean Kenth “when traction battery is charged by cable” ??

I mean, if the 12v Battery charges to, when the traction Battery are charged by cable from socket/charge staion (apologize for my bad English)

[philip42h]

30 minutes ago, HSDish said:

Know that I´ve seen something about this at this forum but I can´t find it.

Does the 12v battery charge when traction battery is charged by cable ?

Bizarrely, no it doesn't - unless perhaps you are also pre-conditioning the car ...

... or, at least, that's my understanding from previous discussions.

[HSDish]

4 minutes ago, philip42h said:

Bizarrely, no it doesn't - unless perhaps you are also pre-conditioning the car ...

... or, at least, that's my understanding from previous discussions.

I use to use 🙂 the 20 min. pre heating cabin funktion before driving the car, if it´s  +8 C or below, and with the cable connected to the chargingstation. Do You think that pre conditioning even will charge /maintain 12v Battery, then

[philip42h]

1 minute ago, HSDish said:

I use to use 🙂 the 20 min. pre heating cabin funktion before driving the car, if it´s  +8 C or below, and with the cable connected to the chargingstation. Do You think that pre conditioning even will charge /maintain 12v battery, then

Yes, that is my understanding (as a simple HEVie).

Preconditioning will, inevitably, make use of the 12v system. The 12v supply must, therefore, come from the traction Battery (or else preconditioning would simply flatten the auxiliary battery). So the auxiliary Battery must be maintained from the traction Battery while preconditioning is running.

[HSDish]

4 minutes ago, philip42h said:

Yes, that is my understanding (as a simple HEVie).

Preconditioning will, inevitably, make use of the 12v system. The 12v supply must, therefore, come from the traction battery (or else preconditioning would simply flatten the auxiliary battery). So the auxiliary battery must be maintained from the traction battery while preconditioning is running.

Does that mean that the 12v Battery will charge from the traction Battery , if precondition are used, even if the cable isn´t connected to a charger ?

[philip42h]

2 minutes ago, HSDish said:

Does that mean that the 12v battery will charge from the traction battery , if precondition are used, even if the cable isn´t connected to a charger ?

Yes, I think that it must do ... logic says 'yes' but I have, obviously, absolutely no evidence of this ... 😉

[nlee]

It does charge (to a degree) when plugged in, but I believe it is only when the Battery heating or cooling is running. I've seen it happen on the Battery monitor I have. It never goes up to 14+ volts though, usually around 13.4.

[HSDish]

I ask this because the latest month (feb.) we have driven or PHEV solely in EV mode (cable charged traction Battery, no ICE) which is verry nice but I worries a bit about the 12V Battery.

We are going to get the (12v) update by Toyota dealer/garage 9 march. In fact there is two updates to be done

 

[nlee]

Here's an example of it happening. But I was wrong above, it's only about 12.6-12.8v. it does add a little bit of charge though.

[philip42h]

9 minutes ago, HSDish said:

I ask this because the latest month (feb.) we have driven or PHEV solely in EV mode (cable charged traction battery, no ICE) which is verry nice but I worries a bit about the 12V battery.

We are going to get the (12v) update by Toyota dealer/garage 9 march. In fact there is two updates to be done

OK, this is a slightly different question ...

The 12v auxiliary Battery will be maintained / recharged automatically all the while that the car is in Ready mode - whether or not you are in EV mode or the ICE is running.

The two updates are for:

1. The eCall (DCM) system to make sure that it switches off when it should so that it does unnecessarily drain the 12v auxiliary Battery.
2. The rather odd "too long in EV mode in the cold" issue.

[HSDish]

3 minutes ago, philip42h said:

OK, this is a slightly different question ...

The 12v auxiliary battery will be maintained / recharged automatically all the while that the car is in Ready mode - whether or not you are in EV mode or the ICE is running.

The two updates are for:

1. The eCall system to make sure that it switches off when it should so that it does unnecessarily drain the 12v auxiliary battery.
2. The rather odd "too long in EV mode in the cold" issue.

Thanks a lot!

Now I can sleep peacefully ( ok off course theres a lot more important things to be worried abot)

[richie69]

When plugged in (not using pre-cooling or pre-heating function) the voltage and amps to the auxiliary Battery go slightly up. Doesn't really charge the aux batter IMO, more like maintains the current SOC on it. This seems to be a thing with most EV's too, Tesla Björn made a video of it. If I remember correctly he suggested to use the pre-heating or cooling function if you want to charge the 12v Battery without actually driving it.

[nlee]

So I'm not going mad! I'd said it normally "charges" at around 13.4v, but in the example graph I posted above, it was more like 12.6-12.8v.

I had a look at the last few days and it was "charging" at 13.6v while plugged in and the traction Battery charging schedule was running. 

I'm not sure why there is a difference in what is seen on different occasions. But it definitely puts charge into the 12v Battery when its running at 13.6v, before charging last night it was 12.4v, this morning, 5 hours after it had stopped charging it was 12.7v.

[richie69]

https://www.youtube.com/watch?v=uXgrXoqEopQ

There's only one "proper" video, where they show the current as well (close to zero, 1...2 amps). I wouldn't count on it to actually charge much, unless using pre-conditioning.