What is the minimum acceptable starting voltage below which external power should not be connected?

The minimum acceptable starting voltage below which external power should not be connected is 22.0 volts. This threshold is set to ensure that the system operates within its safe parameters, preventing potential damage and ensuring proper functionality. Adequate voltage is critical for the reliable starting and operation of the system, as lower voltages may not provide sufficient power for the components to function correctly. By establishing 22.0 volts as the minimum threshold, the system ensures that it can maintain operational integrity when starting up, avoiding complications associated with insufficient power levels. Thus, connecting external power below this voltage could compromise the system's performance or lead to failures, making it essential to adhere to this guideline.