Su-Kam inverters are very well known for there power backup sources.
The Pure Sine Wave inverter is the best inverter till date .
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. The price range of these invertes is reasonable .