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Need help understanding the purpose of this circuit

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Thread Starter

stephen1701d

Joined Mar 29, 2021
1
Hello,
I am trying to understand the circuit below, but I am having trouble fully understanding its purpose. A set of 24V batteries are connected to the drain of the MOSFET. The source feeds a bus bar. Also connected to the bus bar is a vehicle alternator that supplies 28V when it is running. So, the alternator charges the batteries. The TVS diode seems to be for overvoltage protection. What purpose is the MOSFET serving?

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