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USNS Sgt. William R. Button (T-AK-3012), formerly MV Sgt. William R. Button (AK-3012), is the fifth ship of the 2nd Lt. John P. Bobo-class cargo ship built in 1986. [1] The ship is named after Sergeant William Robert Button, an American Marine who was awarded the Medal of Honor during the first United States occupation of Haiti for assassinating the Haitian freedom fighter Charlemagne Peralte.
A trickle charger is typically low-current (usually between 5–1,500 mA). They are generally used to charge small capacity batteries (2–30 Ah). They are also used to maintain larger capacity batteries (> 30 Ah) in cars and boats. In larger applications, the current of the battery charger is only sufficient to provide trickle current.
A charge controller, charge regulator or battery regulator limits the rate at which electric current is added to or drawn from electric batteries to protect against electrical overload, overcharging, and may protect against overvoltage. [1] [2] This prevents conditions that reduce battery performance or lifespan and may pose a safety risk. It ...
The efficiency improvement is mainly achieved from the system no longer being locked at a specific frequency (usually 60 Hz on ships), even though a 60 Hz power source can also be connected to the grid. This new freedom of being able to control each power source totally independently opens up numerous ways of optimizing fuel consumption.
The energy used to charge rechargeable batteries usually comes from a battery charger using AC mains electricity, although some are equipped to use a vehicle's 12-volt DC power outlet. The voltage of the source must be higher than that of the battery to force current to flow into it, but not too much higher or the battery may be damaged.
While there are losses in the charge/discharge cycle and in the conversion of electricity to motive power, Rutter points out that most electric boats need only about 1.5 kW or 2 hp to cruise at 5 mph (8 km/h), a common maximum river speed and that a 30 hp (22 kW) petrol or diesel engine producing only 2 hp (1.5 kW) is considerably more ...