Wow, an off-the-wall question that I have experience with!!! We have a stationary crane where I work. It has an automotive a/c unit run by an electric motor. It is geared 2:1 (2 turns of the motor to 1 turn of the compressor) We use a 1725 rpm motor. I currently has a 5 hp 3 phase motor on it and come summer, it will, no doubt burn up yet another motor. This year I'll up the hp in hopes of precluding another melt down to a 10 hp motor. A 10 hp THREE PHASE 480v motor draws about 20 amps. (Guessing... the NEC* is at work.) AFAIK they don't even make a 120v 10 hp motor. If they did, it would draw about 80 amps. That's a lotta juice, my friend. Not really practical. Wait, I just found the 1999 NEC*... 10hp single phase, 120v motor draws 100 amps. That's 4 ga. wire to feed it. About the size of your jumper cables. Definitely more than your local campground will have available. Jim * National Electrical Code > Folks, > We are planning a 3 week x-country camping trip this summer. Although we will > not be camping with access to power most of the time, it would be nice to have > the option of A/C at night if it is really hot out. > > Not wanting to lug around a household A/C unit or install an oversize R/V > unit, I thought, why not use the existing refrigerant loop? > > - Add second clutch to Compressor with belt to A/C motor > (or some other means to power the compressor off > another source) > - Add control electronics > - Interior Air temp sense > - Evaporator fan control (interior fan) > - Temp sense of Condensor and Fan speed control to > reduce noise emissions > - Control of A/C motor > - Safety sense (Low press. sensor,etc..) > - battery charger to maintain charge with all the > 12V fans running > - etc.. > > Questions: > - How much power does the A/C compressor use? > - What is the most efficient speed (RPM) for > compressor operation? > > Just an idea.... Opinions? > Thanks, > Ezra > '88 Westy > '86 944 |
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