This document provides specifications for the GPU 1500, a portable ground power unit. The GPU 1500 has a 1556 amp/hr cell capacity and 26 amp/hr cell configuration. It is suitable for starting small turboprop and piston aircraft as well as free turbine helicopters. The GPU 1500 has a rugged stainless steel case and features like a digital voltmeter, push/pull on/off contactor, and integral charging modules. It is in continuous production and used worldwide by the military.