Hi Blacksheep, quite unlikely scenario...
Btw, assuming all the rest is working fine, the consequences would be:
Losing the inverter. No big deal, as the AC Stby bus would be powered by the Transfer bus 1.
Losing the Switched hot battery bus. In my book, that means losing the APU generator control, Autopilot A and B warning, DAA 1, Fuel SOV indication, Fueling valves, IRS 1 and 2 (DC), Thrust Reverse control.
Losing the Hot Battery bus. The list gets longer... Relevant items are: APU starter, all Fire bottles, 1 and 2 Eng Fuel Shutoff valves.
Losing the Battery Bus. Very long list.... Many relevant items lost, including Fire Detection.
In actual life, this scenario would come up only after losing all generators and wasting too much time in the air....
Cheers, LEM