What voltage is used for battery start?

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Multiple Choice

What voltage is used for battery start?

Starting the engine relies on turning the starter motor with a large amount of current, and using a higher system voltage makes that easier because the current required for the same power is lower. In aviation, the standard starter circuits are designed around a 28-volt DC supply, which provides efficient, high-torque starts while keeping wiring size reasonable. Some aircraft use 24-volt systems, but 28 volts is the typical nominal value for battery start. A 12-volt system is far too low for most aircraft starters, and 23 volts isn’t a recognized nominal value in aviation electrical standards.

Starting the engine relies on turning the starter motor with a large amount of current, and using a higher system voltage makes that easier because the current required for the same power is lower. In aviation, the standard starter circuits are designed around a 28-volt DC supply, which provides efficient, high-torque starts while keeping wiring size reasonable. Some aircraft use 24-volt systems, but 28 volts is the typical nominal value for battery start. A 12-volt system is far too low for most aircraft starters, and 23 volts isn’t a recognized nominal value in aviation electrical standards.

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