Use Contactor with JBD 150A "Smart" BMS

[railcon56]

How would I do it?? Or do I even need one? I'll have 4 12v 300ah batteries each with 150A Bms, connected to A Victron Multiplus 12/3000 Inverter.

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[sunshine_eggo]

JBD are typically FET based BMS's that open the circuit via solid state electronics. I don't know that they can be made to work with an external relay.

I assume you meant MP 12/3000?

Each of your 300Ah batteries can discharge 150A, so that's 600A total when they are in parallel.

3000/12/.85 = 294A, so you're well over that.

 

[railcon56]

I remember seeing one of Wills videos that mentioned with Victron you could use the relays on the inverter to cut it off??? (Maybe I'm wrong).. Optocoupler SSR ?