APC 1.1KVA @ 5.5k BTW post your complete config and your budget also.
It wont work for PC,coz the delay is higher in inverter than UPS,hence your PC will shutdown damaging components like HDD and Motherboard.
Nope, not really. Though its not recommended.
But everyone is using such UPS these days.
No one goes with a Pure Sine wave UPS. They are costly.