I had 4x 12v 105AH batteries connected in series and parallel to make 24v and 210AH.
200AH deep cycle batteries are not worth it, they only have like 300 cycles at 50% deep cycle. So if you do the maths, 3 x load shedding intervals a day = 3x a day your batteries are going to cycle to 50%. Within 100 days you will have hit the 300 cycles. After 365 days of load shedding 3 times a day, your batteries will be screwed and you wont get 20min out of them. At this point you will need to replace the batteries again.
With these Batteries being about R2000, you will spend R4000 every time you replace them... It costs R9000 for a 12v 105AH Lithium Ion battery that will last you 6 years at least.
So buying new batteries every year is going to work out a shitton more expensive than lithium ion.