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Class T fuses to be installed on each string of batteries. Any other suggestions as to the questions I asked about?

Batteries: Twelve 12v200ah Vestwood batteries. 4 on each shelf of shelving rack = 48v * 3 strings. Each string is connected to a bus bar for connection to the load. All in one MPP 3048-LV-MK. The all-in-one says 4 AWG. The battery skimpy one page product manual says 2 AWG. I tried a dry run...