Installed Su-kam Sine Wave inverter at home about 8 years back and power cuts is history.Although I had replaced the battery but the inverter never gave me any major problems.It had UPS and Inverter mode according to the need if you have a UPS for a computer.
This 2 battery power sourced inverter has a battery backup of around 18 to 20 hours which is really good .
Also the inverter comes with the battery body case which is very durable and has wheels in it which is easy movable also .
The service is also good .