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A: Batteries are always sold in pairs.
B: If you have 4 or more panels, it is recommended that you purchase a set of two batteries at a minimum to complement the increased power.
C: For larger systems (e.g 4-8 panels...you should consider 6-12 batteries).
D: Battery voltage will diminish over time therefore batteries should be regularly charged to keep them at optimum operating performance.
Battery specifications: Centennial CB12-120S (12V118.6Ah)