How to Connect a 220v60hz Dive Compressor to a 110  60hz Generator

Stop work.

Examine the generator, and determine whether it is 110-0-110V "split phase" or not, which is a common arrangement for USA wiring.

• If it is, then the brown wire goes on one of the 110V lines, the blue on the other 110V terminal, and the green/yellow to the earth terminal.
• If it is 110-0 "single phase", then the solution is to procure and install a suitably-rated 110/220V step-up transformer to go between the items. The brown wire goes to 220V, the blue to neutral and the green/yellow to the earth terminal.

Make sure that the circuit protective devices remain uncompromised after connection has been made. One wouldn't want to lose the boat to a fire.

Thanks for the prompt replies. Ok....so I messed up. Now what is the quick solution.How do I know if it's a 110-0-110 split phase or not. What I will do is remove the wiring between the generator and DB of boat, then change the power supply from genset to 240 volt. Wire in the compressor . Once tanks are all filled , then revert to original setup. Does this sound right ? Thanks chaps

Are you sure the generator does not already have a 220/240 output (without rewiring or changing something)? Most generators I've seen (US market) will have dual outputs, usually a few standard 110 outlets, and a specialized 220/240 outlet jack. I realize your gen set is made to be wired in, so it doesn't have a distribution panel built in, but it may have a 220/240 output, that just isn't wired up. Switching things back and forth every time you want to use the compressor would be a major pain.

If you are not familiar with wiring, it might be a good time to invite an electrician onboard.

Tom D.

The scary thing about your statements is that you tought that you could join the two 110V together to make 220V !! But, in any case, I will vwnture the following:

If you have a voltmeter (??? possible?) and know how to use it, then check the voltage between the two 110V outputs. If you read 220V, then you are OK. Connect one wire from each 110V oulet (or pole) and connect them to the motor's poles. You can use a separate plug, only for this motor if you can wire it properly (or feel confident) The earth will still be on the yellow/green.

Otherwise (and wiser!), seek a qualified electrician to check it and do the special plug for the 220V oulet. You do not want to lose the genset or someone arround you, or have a mishap in the high sea. You should not try to rewire the DB each time because you will be compounding the possibilities of errors etc.

All PWSlack's electrical advice is good.

Changing motor from 50Hz to 60 Hz will increase the pump speed by 20%. This may just increase the power required by 50% but maybe the pump is not rated for 20% faster. Were these factors considered?? Having a compressor fail while you are "full fathom five" is not healthy!

67model

Re-read the OP's post, he already changed out the motor for a 60Hz model.

Tom D.

Dear Tom D.

He changed the motor, upping the speed 20% (with same number of poles), but does not say the PUMP was OKed for the higher speed - consequently I commented.

67model

I smell smoke tmctech gave you just about all you need......best of luck

Can you take a picture of the Gen and Motor nameplate information and post it here?