As the title suggests I have an mppt with a non inverter cable for bms control, I'd like to be able to monitor the mppt, is there a way of connecting a dongle or mppt control via some sort of adaptor for the ve direct port? Many thanks for any input.
Unfortunately no, the VE.Direct port is a 1-to-1 comms port, so it can't be Y'd or anything - it's an either-or.
What MPPT do you have? If it's one of the smaller ones without a remote jumper, then your other option would be converting the VE.Direct port back to normal operation, connecting a VE.Direct Bluetooth Dongle (or MPPT Control) to it for monitoring, and then installing a Smart BatteryProtect in Relay mode, triggered by the BMS, to disconnect the MPPT from charging as per https://www.victronenergy.com/media/pg/Smart_BatteryProtect_12V_24V/en/installation-and-wiring-examples.html#UUID-d99d5bf6-0504-4954-8562-1d4f14511bc9
