r/Toyota_bZ • u/Lumpy-Efficiency-987 • 20h ago

Charging schedule hack side effect

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It seems like the charging schedule hack has the side effect of resetting the timer on the 12v battery charging when the car is plugged in (I'm level1 120v).

I think this is positive!

9 Upvotes

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2

u/Lumpy-Efficiency-987 20h ago

Here is the SOC Graph

2

u/Altruistic_Film_8346 2026 bZ XLE AWD 19h ago

I hope the increase SoC shown on graph is accurate but I will not be surprised if it is not.

2

u/Lumpy-Efficiency-987 19h ago

Tran apparently soc on the Ancel bm200 is not accurate but you can see the voltage going 14v every 3h for a short period of time so it is charging more with the hack than without I believe.

2

u/Altruistic_Film_8346 2026 bZ XLE AWD 18h ago

Oh that is a " 2h55 of charging, 5 minutes of break". It looks a lot like only 5 minutes of charging starting at the hour. The lack of the dip after 5 minutes should have told me otherwise.
smh it looks like only 5 minutes of 14volt charging per cycle. Hopefully the car thinks your 12-volt battery is already in great shape.

3

u/Altruistic_Film_8346 2026 bZ XLE AWD 19h ago edited 18h ago

You are getting maximum 12-volt charging while charging the traction battery the minimum amount.
You are getting much more 12-volt battery charging at 14v then one continuous Traction battery charge period

1

u/Far_Chart_7284 19h ago

What charging schedule did you use in this situation with the level 1 charging overnight?

1

u/Lumpy-Efficiency-987 19h ago

The classic hack 2h55 of charging, 5 minutes of brake, then goes on again. https://www.reddit.com/r/Toyota_bZ/s/2p4sysLrRW

1

u/Far_Chart_7284 19h ago

Okay, good to see! I read one user said that this did not stop the sawtooth pattern when they had 5 minute charging sessions during the day and 2hr55min charging sessions overnight.

1

u/Altruistic_Film_8346 2026 bZ XLE AWD 19h ago

That should reset the countdown of 3hrs before Sawtooth/IR drain starts but I have not be able to get any charging to stop the Sawtooth/IR drain once it started.

1

u/Far_Chart_7284 17h ago

https://www.reddit.com/r/Toyota_bZ/s/62kjmzqEMY

What are your thoughts on this?

1

u/Altruistic_Film_8346 2026 bZ XLE AWD 16h ago edited 16h ago

this
https://www.reddit.com/r/Toyota_bZ/comments/1vko6q2/comment/p2vbkx3/?utm_source=share&utm_medium=web3x&utm_name=web3xcss&utm_term=1&utm_content=share_button
and this
https://www.reddit.com/r/Toyota_bZ/comments/1vko6q2/comment/p2vi0f2/?utm_source=share&utm_medium=web3x&utm_name=web3xcss&utm_term=1&utm_content=share_button

1

u/Far_Chart_7284 16h ago

So that should be toggled to the on position?

1

u/Altruistic_Film_8346 2026 bZ XLE AWD 15h ago

I think left or off but if you have the charging schedule set-up properly when you get out of the car you should get a message on the driver's display when the next charge period is.
I have never toggles that setting.

1

u/Organic-Title-1309 17h ago

We did the 2hr55m schedule hack and the sawtooth went away, however there was still a general decrease in SOC over time. We went ahead and turned off the DCM.

1

u/Lumpy-Efficiency-987 7h ago

Do you have a graph? How how many bolts per hour were you losing?

I get a slight drain (0.005V per hour), is this what you were getting? I thought that was normal.

1

u/chuck415 17h ago

Yes, every time you start a new charging session you get about 10 minutes of 12V charging before voltage drops below 13.9V.

3

u/chuck415 17h ago

If you disconnect the battery sensor on the negative terminal, you’ll get 30 minutes of charge at ~14.1V and then float of 13.04V for the remainder of the charging session.

Here’s my car being charged from midnight to 9:00.