DLP-MT-A102_Starting and auxiliary battery systems
In DC systems on ships and boats additional batteries are added to provide the electric energy to various consumers. Starter battery have to be divided electrically from other batteries but connected to the same generator at the same time
The total installed power and complexity of the distribution of the DC system on board depends on the size and purpose of the ship or boat.
Modern ships and boats, even in the smallest versions, require significantly more in terms of production and distribution of electricity.
There is primarily the issue of powering lights, powering navigation, other auxiliary devices and various devices to achieve the comfort of a longer stay on board.
If all these devices were powered by only one battery while the propulsion engine was off, there would be a risk that the battery would be so discharged that it would not be able to deliver enough electrical power to the starter to start the engine.
The comfort of using other devices in this case would be significantly reduced because the user should always monitor the discharge of the battery.
Therefore, on ships with DC systems, a second battery or a bank of several batteries is installed to power all other devices, and the starting battery retains only its basic purpose – powering the engine starter.
The diodes in the circuit in the picture have the role of enabling the charging of both batteries at the same time, and on the other hand in the process of discharging completely separate the circuits of the two batteries.
Otherwise, the starter battery would be discharged along with the auxiliary battery and could not provide enaugh power to starter, which would not be the biggest problem.
A bigger problem would be the danger of destroying the starter due to overvoltage.
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