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Marine charging and discharging board is a kind of equipment which provides charging power for the storage battery on board and distributes DC power. It can be divided into: single battery (A: floating charge without emergency discharge, B: floating charge with emergency discharge); two batteries (C: one charge and one discharge without emergency discharge, D: one charge and one discharge with emergency discharge, e: floating charge without emergency discharge, F: floating charge with emergency discharge); with insulation alarm function.

The charging and discharging boards meet the requirements of all levels of codes and meet the classification and construction specifications of each classification society.