Page 1 Page 2 Page 3 Page 4 Page 5 Page 6 Page 7 Page 8 Page 9 Page 10 Page 11 Page 12 Page 13 Page 14 Page 15 Page 16 Page 17 Page 18 Page 19 Page 20 Page 21 Page 22 Page 23 Page 24 Page 25 Page 26 Page 27 Page 28 Page 29 Page 30 Page 31 Page 32 Page 33 Page 34 Page 35 Page 36 Page 37 Page 38 Page 39 Page 40 Page 41 Page 42 Page 43 Page 4413 SELECTING THE CORRECT AIRCRAFT START UNIT Will the GPU be used for regular avionics or maintenance work? High discharge batteries designed for starting are not designed for continuous powering. Consider a GPU with an internal power supply or run our separate DC power supply in parallel with the pack. ✓Recommended: Coolspool cart range or GPU1500/40 or standard battery pack in parallel with one of our power supplies Does the aircraft have tight upper avionic limits that must not exceed 29–30 volts? ✓ Recommended: Coolspool 130, 260 or 410 with batteries configured to a nominal voltage of 26V DC instead of 28V DC Is the requirement for line ops on regional/ commuter aircraft-typically ATR and Q400 aircraft? In this case, there must be sufficient capacity to deliver continuous ground power for 30-40 minutes and to start a heavy turbine. ✓ Recommended: Coolspool 410 (designed for this application) Is continuous DC power required for maintenance or training? Select a DC power supply. Ensure input circuit breaker is rated to handle the maximum required DC output. ✓ Recommended: PS50, PS100 or S300 How many engine starts are required before the GPU can be re-charged? Remember: starts, pre-flights and line ops require amp/hr capacity to maintain volts. More starts require more amp/hr capacity and more weight, and therefore a larger size DC battery cart. ✓ Recommended: Coolspool 410 Is engine free turbine or shaft turbine/turboprop or turbofan? Longer spool-up times of shaft turbines will require more amp/hr capacity. ✓ Recommended: GPU1400/40 NOTE Selecting any portable GPU is not an exact science. It is a compromise between weight, size, necessary performance, recharge time, battery life and price. It should be noted that the life of the GPU is affected by the depth of discharge each time the GPU is used. The deeper the discharge each time, the sooner the batteries will need replacing. It is preferable and more cost effective to buy a GPU with maximum amp/hr capacity. Selecting the correct unit