Question: The user can select the main input voltage for the Industrial frequency inverter?

Answer:

1. Yes, There have 3 option , but buyer should be confirm before purchase.
   
2. Pure DC Input without AC Bypass , if without ac input , the inverter will stop working.
   
3. DC main input and ac bypass. When there have ac and dc input at the same time , dc voltage have priority , when dc voltage cut off , it can switch to ac for input in automatic.
   
4. Ac main input and dc bypass, When there have ac and dc input at the same time , ac voltage have priority , when ac voltage cut off , it can switch to dc for input in automatic.