[Elithion]

I'm ready to hook up my BMS with my Elcon charger. ...
Is it mandatory to use the circular connector on the charger?

No.

The fallback option is to use an AC relay to connect / disconnect power to the charger. The BMS can drive the coil of that AC relay. See:
http://lithiumate.elithion.com/php/system_wiring.php#Chargers

Davide
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Ford V Platform Specifications