Zombieverter and Simpbms interface

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Mhs
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Zombieverter and Simpbms interface

Post by Mhs »

Hello,
TL;DR what gets communicated between Zombieverter and simpbms? Does simpbms "know" when Zombieverter is in Driving or charging (via CAN) for the balancing to work (or not to work)? :?:

Now for a little bit longer description, I will start by saying that english isn't my first language so excuse me if I don't find the right words (or technical terms), secondly I would like to thank everyone for their contribution to Zombieverter and Simpbms.
Now for the question, I don't have a full simpbms (hardware) setup, just a teensy 3.2 I found in my pile of electronics "junk" and a what-I-believe a compatible CAN Transciever, I have the teensy programed with BMWphevBMS hex for my SP41 bmw battery 12 kWh battery, I read enough to understand how to communicate with the battery slaves (5v, grd and CAN), my intention is battery monitoring and balancing and I can't seem to find if the SimpBMS will know the Zombieverter "mode" via CAN in the default simpbms configuration or if the only way is to have hardwire charge qnd drive with proper simpbms hardware.

Thanks again, I would appreciate any help

Edit: please tell me if this is the right forum or this should be moved to BMS.
Zombieverter
Outlander rear motor & Inverter
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tom91
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Re: Zombieverter and Simpbms interface

Post by tom91 »

Mhs wrote: Sun Aug 17, 2025 2:19 pm what gets communicated between Zombieverter and simpbms?
Zombie listens on the CAN bus for:
Min max temps
Min max voltages
Charge current limit
Mhs wrote: Sun Aug 17, 2025 2:19 pm Does simpbms "know" when Zombieverter is in Driving or charging (via CAN) for the balancing to work (or not to work)?
Balancing works above the balancing threshold if the BMS is happy
Creator of SimpBMS
Founder Volt Influx https://www.voltinflux.com/
Webstore: https://citini.com/
Mhs
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Re: Zombieverter and Simpbms interface

Post by Mhs »

tom91 wrote: Sun Aug 17, 2025 2:32 pm Balancing works above the balancing threshold if the BMS is happy
That's noted thanks, one more question, I read somewhere that we are not supposed to "balance" while driving, is that right and a thing that I should consider?
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tom91
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Re: Zombieverter and Simpbms interface

Post by tom91 »

if you run this code from here: https://github.com/Tom-evnut/BMWPhevBMS

You can use the drive and charge input to control when it is allowed to balance. As long as you operate it in EV mode.
During driving balancing is off.
Creator of SimpBMS
Founder Volt Influx https://www.voltinflux.com/
Webstore: https://citini.com/
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Re: Zombieverter and Simpbms interface

Post by Mhs »

tom91 wrote: Sun Aug 17, 2025 3:04 pm if you run this code from here: https://github.com/Tom-evnut/BMWPhevBMS

You can use the drive and charge input to control when it is allowed to balance. As long as you operate it in EV mode.
During driving balancing is off.
Yes I'm using this code
As I don't have SimpBMS hardware I will have to wire up the inputs directly to the Teensy (with stepdown voltage to 3.3).
If I have a bit more understanding of coding I could "theoreticaly" use CAN to switch between drive and charge.
But what you have said is well noted with thanks.
Zombieverter
Outlander rear motor & Inverter
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