As Additional..
Very 1st you should understand about battery's type..
1) Starter Batteries (Automotive)
These types of battery will Quick charge and Quick Discharge with small life for inventors or UPS. But are best when electricity coming for 1 hr and going for 2 hrs..
2) Dry Deep Cycle Batteries.
These types of batteries are for long backup and long life with Long time charging by low amperage for long backup, so these batteries are failing according to here load-shading. If we will increase charging amperes then these batteries will be swell and over heat.
3) Tubular Plate Battery.
These batteries are type of Deep Cycle. But difference is Quick Charge in minimum time for long backup with long life.
So Tubular Plate Batteries are best for UPS and Invertors and set for load-shading timing in PAK. Also perfect set for Solar Sys..