DONOT buy homage. APC 1500SUI is suffiecient for your needs , but charging isnt that good of that unit for summer loadshedding. you need atleast 130AH x2 or x4 batteries depending on your ups. higher is better.. but the 1500sui isnt capable of fully charging batteries of 165AH and above due to extreme loadshedding here.. a higher powered unit like the 220VA or above is more suitable.. with that you can even use 4 smaller 100AH batteries and get loads of backup and very fast charging.
@ atiq. as per your previous PM, the apc 1500SUi unit is not suitable for your current and future solar needs.. its much smaller.