Is it possible by using three 12V dc to 220Vac,1550W inverter by supplying them 12Vdc parallal circuit from a 50Vdc source, can I get 3Phase AC output.
3-phase voltage has 3 ac voltages shifted in phase by 120° ..
3 individual inverters have to be 'clocked' from one single clock base that can provide 3 control signals shifted by 120° ..
Another issue is that the inverters in question operate from 12Vdc and you want them to somehow accept 50Vdc ..
Without major modification they won't do that ..
I think synchronization will be main problem. You can get 3 phase output but not in exactly 120" phase diffrence. Also connecting three inverters in series to get 3*12=48V is not good idea.