Portable compressor motor swap

[SeaKing98]

I have a portable gas compressor with a five HP Honda gas engine. I am thinking to convert it to electric for my boat. I have a 6.5 KW diesel generator on the boat, so I should be able to run a single phase motor strong enough for the compressor. Any suggestions.

Thanks for any input!
C King

 

[oxyhacker]

Do you have 220V? That makes all the difference when it comes to running a compressor. It only takes a 3 HP electric to replace a 5 HP gas. Go by the amperage not the alledged HP - you want something drawing at least 15 amps/220V. If you only have 110V then you might want to derate the compressor (slow it down with a smaller drive pulley) so you can use a 110V 2 HP motor.


Make sure your generator can handle the load - things aren't always what they seem when you are driving a big motor from a generator, there are startup loads and other issues to consider.

When I need a motor I usually get an industrial surplus or pull from Surplus Center in Nebraska. Last time I checked they had, among others, a 15 Amp/220V motor that is mislabled as a 1 HP for only about $70 that has worked well as a replacement on several small compressors orginally fitted with 5.5 gas Hondas.

 

[pescador775]

If there is a start load problem this can be avoided by installing a clutch. On my home made portables there is a belt tensioner which is used to engage or release the pump. Consists of a ball bearing press fitted onto a steel boss. The boss is drilled/tapped to accept a knob. The knob is turned to release the bearing which is normally held tightly in place. Thus, the bearing can be raised or lowered, and locked in position, to control the belt. I'll take a pic if there are ?'s.
Pesky

 

[Surface Tension]

You can also call the manufacturer rep in your area. I bought a used bauer gas powered compressor and converted it to electric. I got lucky and bauer in Miami had an extra motor they had just taken off a unit just like mine and I got a deal on it. I wasn't sure if I bought a surplus motor if the frame holes and such would line up or what sized pulley I would need so I played it safe.

Good luck.

Dave