The Warranty for the S-530 (S530) battery is seven (7) years. The first 24 months is replacement. The next 60 months is prorated.
For a Single String 530 (S-530) AH Bank, you will need 2 of the S530 (S-530) for a 12 Volt System, 4 of the S5300 for a 24 Volt System and 8 of the S530 (S-530) for a 48 Volt System. Each additional string will multiply the AH.