This document describes CoolSpool's range of 28-30 volt portable GPUs and start carts. The CoolSpool 26 and 52 GPUs can boost voltage via mains input to just below the upper limit of aircraft Fadec systems, providing almost 9% more power and over 3200 extra watts compared to other 28 volt packs. The CoolSpool 130 and 260 start carts offer integral 40 amp 28-30 volt DC power supplies and have peak amp capacities of 1600 and 2000 amps respectively. They are designed for operators of 20-80 seat turbo prop and turbine aircraft.