I'm wondering if V2L is necessary.
Would 'Poor Man's V2L' not work with your existing ZS?
I don't know about the MG ZS, but I believe the DC to DC converter on the MG5 is rated at 178A at 14V DC, which equates to about 2.5kW. If a 2.5kW power inverter was connected to the 12V battery, then in...