What is the minimum voltage required for GPU start?

The minimum voltage required for a Ground Power Unit (GPU) start is 28V. This specification is common in aviation settings, where many aircraft systems operate on 28V DC power. GPUs are designed to provide the necessary power to start aircraft systems, and 28V ensures that the unit can deliver sufficient energy for the required operations without risking damage or malfunction.

A voltage of 28V allows for consistent and reliable performance, which is crucial during the starting sequence of an aircraft. While there are equipment that may operate at different voltages, 28V is a standard practice for numerous aircraft, ensuring compatibility and safety. This standardization helps prevent operational issues and provides a uniform requirement across various aircraft models, contributing to their effective maintenance and operational reliability.