3HP Compressor

[Rosie]

Hello, I am new to the forum and would appreciate some help if anyone can calculate it, as I am not a techi. Using Clarke Compressor 3hp & 150 litre tank, RPM 2800, kw 2.2, Vol 240, htz 50, amps 13.8 and voltage 450. Need to know hourly cost on domestic electric as I have been told by an electrician that the hourly cost is 50pence.

Clarke the manufacturer very kindly supplied the information below, however there is a vast difference between 12p and 50p. Actual domestic rate is 15.5.
Motor approximately 2000watts so if run continuously would consume 2 units per hour. Unit has 50% duty cycle so max permitted run time is 5mins in every 10mins. This will halve the consumption to 1 unit per hour, so if in use for 8 hours per day will use 8 units. Average cost of electrical unit 12pence so 8 x 12 = 96pence per day.

Hope someone can advise. Thanks​

 

[RogertheBodger]

Hello, I am new to the forum and would appreciate some help if anyone can calculate it, as I am not a techi. Using Clarke Compressor 3hp & 150 litre tank, RPM 2800, kw 2.2, Vol 240, htz 50, amps 13.8 and voltage 450. Need to know hourly cost on domestic electric as I have been told by an electrician that the hourly cost is 50pence.

Clarke the manufacturer very kindly supplied the information below, however there is a vast difference between 12p and 50p. Actual domestic rate is 15.5.
Motor approximately 2000watts so if run continuously would consume 2 units per hour. Unit has 50% duty cycle so max permitted run time is 5mins in every 10mins. This will halve the consumption to 1 unit per hour, so if in use for 8 hours per day will use 8 units. Average cost of electrical unit 12pence so 8 x 12 = 96pence per day.

Hope someone can advise. Thanks​

Hi Rosie,

The bits you need to pick out of that is "2000 watts if run continuously would consume 2 units per hour"
Thats 2 x your domestic rate = 31p. per hour.

 

[Engineer54]

According to the manufacturer, it's not continuously rated!!! Like many motor driven apparatus, it has a ''Duty Cycle'' , in this case 50% The duty cycle is probably related to the tank fill/top-up times, if so, then the duty cycle will be automatic, as the compressor will automatically shut off when full, and start at a predetermined level for topping up while in use. So i'd be inclined to go by the manufacturers information, but using the actual 15.5p rate, instead of the average rate quoted by the manufacturer....

50p an hour, i would say is a totally wrong assessment!!! Question : What is that ''450 volts'' all about then??

 

[telectrix]

i queried the 450v but my post has got lost in cyberspace somewhere. if it's 2.2kw, 1 phase thats near as dammn 30p/hour actual running time

 

[Richard]

Is it 230v or 415v??

The reason I ask is I have the 160L version and I don't recall seeing a 3 phase version - I could be wrong though.

Rich

Edit: Just read the OP properly - and it states it's 230V - Doh!

 

[telectrix]

doesn't say 230volts on my copy of the OP.says voltage 450

 

[Engineer54]

i queried the 450v but my post has got lost in cyberspace somewhere. if it's 2.2kw, 1 phase thats near as dammn 30p/hour actual running time

Not when you take the 50% ''duty cycle'' into account, like the manufacturer states more like 15/16p an hour!!


I read vol 240 as volume, definitely states 450 volts though!! lol!! ...probably a typo!!!

 

[RecycleElectron]

I hesitate to raise this but the load varies with the pressure differential so it will consume different amounts of power depending on the type of air usage and how often it starts (not the same as duty cycle necessarily) , what you set the tank / tool pressures at etc. I've got a similar tool and I would agree with Engineer 54 on the basis of an arbitrary cost, although if you need this type of gear I'm not sure a difference of a few pence an hour matters much. With the big tank they don't always run as much as you think they might in ordinary general use. With compressed air, leaks are not always bothered about but are very costly. The main problem with single phase on this type of gear is in-rush current. Needs a type C and makes the distributor nervous if you tell them on some domestic supplies. I assume domestic type supply as you would probably buy 3 phase otherwise.