I missed that you have a 24V system.
So to sizing, you'd need more batteries to get things to 24V, and since you quoted your load in amps, the amp rating requirements stay the same.
So to do a 24V, 30A load for 12 hours you'd need 14 12V deep cycle batteries in series/parallel (24V @ ~700 Ah). It would be 16 GC-2 (24V @ ~800 Ah) wired in series/parallel.
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