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The number of busbars affects resistance losses, and therefore the increasing distance between two metal contacts causes resistance losses. 9BB cells have more busbars than 5BB cells, which reduces internal resistance loss by creating the bus spacing smaller, extending the lifetime of the cells.
As within BougeRV 9bb solar panels mentioned above, 5BB equals five pumps, and 9BB equals nine pumps. Inside the specified limits, nine pumps (9BB) are nearer to each other than five pumps (5BB), and more water may be collected with less loss. “

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The number of busbars affects resistance losses, and therefore the increasing distance between two metal contacts causes resistance losses. 9BB cells have more busbars than 5BB cells, which reduces internal resistance loss by creating the bus spacing smaller, extending the lifetime of the cells.
As within the water transmission example mentioned above, 5BB equals five pumps, and 9BB equals nine pumps. Inside the specified limits, nine pumps (9BB) are nearer to each other than five pumps (5BB), and more water may be collected with less loss. “