Review Compressor electric spec

[BRT]

But you replied to a comment about 220V Review - Compressor electric spec

On a thread about a 110 volt 27 amp compressor.

 

[tbone1004]

2.2kw = 3HP (746W per HP). That is the motors output rating.
Stated as 83% efficient.
2970 x 83% = 2465 A lot closer. Put some rounding errors on the values and it adds up. A not very efficient 3HP motor that sucks 3kw of electricity and makes about 700 watts in pure waste heat.

It's efficiency stated at 83% is probably high but the ~75% from the calculation is about normal for single phase motors. Not a whole lot else you can do to make them more efficient which is part of why all the big motors are 3p and also why you are starting to see "inverter technology" on all sorts of things from refrigerators, to HVAC, to high pressure compressors which are all using 3p or BLDC motors

 

[BRT]

It's efficiency stated at 83% is probably high but the ~75% from the calculation is about normal for single phase motors. Not a whole lot else you can do to make them more efficient which is part of why all the big motors are 3p and also why you are starting to see "inverter technology" on all sorts of things from refrigerators, to HVAC, to high pressure compressors which are all using 3p or BLDC motors

Efficiency really means little for a 3kw input motor that doesn't run days at a time. Here it would cost 18 cents an hour to run. There are places in the US (Hawaii, parts of California) where the running cost might approach $1.20 per hour. Those figures are high, because the compressor is not always running at full load. You can't afford to pay much for a more efficient motor to save 10% of those figures when you are unlikely to run it over a few hours a week.

 

[tbone1004]

Efficiency really means little for a 3kw input motor that doesn't run days at a time. Here it would cost 18 cents an hour to run. There are places in the US (Hawaii, parts of California) where the running cost might approach $1.20 per hour. Those figures are high, because the compressor is not always running at full load. You can't afford to pay much for a more efficient motor to save 10% of those figures when you are unlikely to run it over a few hours a week.

true, I was just trying to point out that the efficiency was "normal" for a 1p motor and the only way to approach 90% efficiency is to get a VFD on a 3p motor

 

[marc.collin]

problem is i don't think with a conventional wall plug can support higher then 20 amp

 

[Open Ocean Diver]

But you replied to a comment about 220V Review - Compressor electric spec

Does your electrical panel have space for another breaker say 50 amp single pole?

 

[Whitrzac]

I have one of these compressors. I've run tanks up to 4000psi with it. I've seen a max draw of ~20a on my kill o watt meter with it.

 

[marc.collin]

I have one of these compressors. I've run tanks up to 4000psi with it. I've seen a max draw of ~20a on my kill o watt meter with it.

what model? 110v?

 

[Whitrzac]

Yes, the 110v one

 

[marc.collin]

Yes, the 110v one

Tuxing TXEDM043 ?
you connected the compressor on a 20a breaker?