[jbman]

You can get a BMS that does not go in line with the batteries, and it manages the charger, balancing, and the main contactor. Zeva and Orion are examples. Why not use one of those?

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[jbman]

You are mistaken. Many BMSes intended for use in high current applications have specific port(s) for connecting charge/discharge contactors. Here is a wiring diagram for Zeva BMS16, with two separate contactors clearly visible :

http://www.zeva.com.au/Products/images_lge/BMS16v2_Example.jpg

I don't think that diagram proves what you think it proves...

The discharge current is not under the control of the BMS normally. The controller throttles that and keeps it within limits. This diagram shows the BMS controlling the main contactor (to open it if a cell is low) and a charge contactor (to prevent overcharging). Neither of those are concerned with discharge amperage. The only reason it has a shunt is for state of charge calculation, probably. That's all my Zeva does with the current sensor.

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[jbman]

Except you said



Which I explained it often can't do, as there there may be no integration between the BMS and the charger.


I also responded to jbman thinking that was your comment. Sorry jbman

It's all good.

ZEVA can communicate with several chargers via canbus or by triggering an enable relay. I even used a TC charger and ZEVA was able to set the charge parameters over canbus.

The type of BMS that the OP is referring to actually pushes all power through the BMS, hence his question of how large he should go. I don t see any reason to use a BMS like that in this application, even if they have one that is robust enough for it.

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