What's the total load and what kind of load are you going to be running on this system?
It says that it can handle upto twice the capacity for a few seconds (high in-rush current in case of motor or pump), but in reality, I've seen it doesn't even run a 1.5HP pump. It can run it but not able to start it due to high in-rush current.
I bought the inverter for 11k during some sale 2 years ago and Luminous solar batteries for 13.2k a piece. The prices for solar batteries must have increased because earlier they were in the 5% GST category, but I believe they are now under 18% GST. Normal batteries are under 28%,I believe.