Onboard Charger Killswitch

[Rwalsh77]

Would this work? I found some info about putting the shunt inline with the negative side of the battery.

Info on this little unit is sparse and confusing. Thanks in advance




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[Sergio]

Yes, that is the same wiring as in the first option on your last post.

Make sure the jumper is on the 2W (2-wires).

In theory You should be able to do a full charge, set the AH capacity of your pack (120AH or 116AH) and then set the "real time" or "current capacity" which would be the same at that point.

I think the battery graph that shows the discharge level is based on that AH setting and not the voltage, so assuming it is anywhere near accurate, it will give you something to compare your SOC estimation based on the pack voltage vs SOC based on AH remaining.

[Rwalsh77]

Thank you Sergio, you have been a big help... going to install this gauge over the weekend instead of the simple voltmeter I am running now.

[Rwalsh77]

Originally Posted by E36Racer

I have the newer 84 ah cells which the absolute bottom cutoff danger zone is 2.5v, max is 4.2. I think yours are the same. Granted, once they get to 3.5 they drop like a stone, but 2.5 is the rated threshold before risking damage. I've never gone below a resting voltage of 3.65 and I have my charger set to stop at 4.18 IIRC. BMS low voltage alarm set at 3.5 since I figure I've got about another mile (maybe 2) left in the tank before it's getting too close to the 2.5 dangerzone. However, I doubt I will ever hit the low voltage alarm, unless I'm just out hot rodding it all day.

I'm running the ZEVA BMS, Zeva.com.au (I have the EVMS Lite with two BMS-12 modules) I'm happy with it so far. Fairly easy to wire up and worked like a charm with all of the CAN bus stuff. And I love the dash mounted LCD touch screen. It's all in my build thread. The Orion Jr. is another option, but a little more expensive. EVBattery center, I think, is selling their BMS again but with zero tech support for now so you better know what your doing if you go that route.


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dude! your build thread is amazing and the way it all came together is impressive.

couple questions...
can you tell me why you went with 2 of the BMS-12's?
with my current pack wiring, would i only be monitoring 5 cells? (i noticed you had 7 of your 8 wired in your diagram)

edit: i may have answered part of the questions, i printed out your diagram and i see you are running 7 packs (cells each) and the BMS can only handle 12 (i think) cells so you needed 2 to run 14 cells

follow up on that... would i only need one since i only have 10 cells?

[E36Racer]

Originally Posted by Rwalsh77

dude! your build thread is amazing and the way it all came together is impressive.

couple questions...
can you tell me why you went with 2 of the BMS-12's?
with my current pack wiring, would i only be monitoring 5 cells? (i noticed you had 7 of your 8 wired in your diagram)

edit: i may have answered part of the questions, i printed out your diagram and i see you are running 7 packs (cells each) and the BMS can only handle 12 (i think) cells so you needed 2 to run 14 cells

follow up on that... would i only need one since i only have 10 cells?

Thanks for the compliment.

Yes I needed 2 for the 14 cells, you would only need one for 10 cells. I wanted to run all 16 but the XCT can only handle 62 volts so those last two cells are just along for the ride




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