How much kw an electric motor 3/4 horsepower use per hour

Depends on power requirement. My whole house uses approx 4 kW to run air con and rest of the house power. 19 x 350 solar panels generates 1 kw to 6.5 kw per hour through a 6 kw inverter.
The variance comes from the sun is not always out, or behind clouds and the panels don't face east and west to capture the morning and evening sun.
They are mono crystal which generate about 1 to 1.6 Kw in cloudy conditions.

As I am on the power grid the excess power is feed back to the power company who pay me 6c per k/w that I feed in during sunny days and then charge me 26c per k/w in peak times when it is dark !
Today I got 40 kw/h generated for the day which with feed in tariff is $2.60 as it was sunny. . I could run the air con on 10 kw/h from the power company in the dark , if the a/c used 2 kw I could run it for 5 hours for free.
Where you run into problem is that on a cloudy day you might get 1 k/w per hour . This is not a problem if you use mains power from a power line supplier as it suppliments any short fall. If you are on a no grid connected system you may need to consider Battery Storage as well to charge up when the sun is out and then it supplements the power to your house when it is cloudy or dark.
The solar panels would need to generate enough power to run the house and to charge up the battery system if used.
Batteries have a limited life of 10 years and usually use lithium Phosphate batteries . You tube has many videos on battery systems and off grid solar setups. However batteries are a changing technology with Electric Vehicles becoming more common.

Please see below courtesy of engineeringtoolbox.com

Electrical power is in general rated in watt (W) or horsepower (HP). A horsepower is a unit of power equal to 746 watts or 33000 lb ft per minute (or 550 lb ft per second).
A watt is equal to the power produced by a current of 1 amp across the potential difference of 1 volt. A watt is 1/746 of 1 horsepower.
Even if the watt is the base unit of electrical power, it is common to rate motor power in either horsepower or kilowatts.

Power in Watts

Direct Current Electric power supply to a direct current (DC) motor:
PkW = ?m U I / 1000 (1)
where
PkW = power (kW)
?m = motor efficiency
U = voltage (V)
I = current (A, amps)
Electric power supply to a alternating current (AC) motor:
Single Phase PkW = ?m U I PF / 1000 (1b)
where
PF = Power Factor
Two Phase Four Wire PkW = ?m 2 U I PF / 1000 (1c)
Three Phase PkW = ?m 1.73 U I PF / 1000 (1d)

Power in Horsepower

Horse power can be expressed as:

Php = PkW / 0.746 (2)
or
Php = (?m U I / 1000) / 0.746
= ?m U I / 746 (2b)
where
Php = horsepower (hp)

Look at your amps and multiply by volts. This will give you watts.


ex.motor label 115V/14.4A 230V/7.2A

Whether you are running on 115v or 230v you get 1,656 watts.
This converts to 1.656 KW (kilowatts)
Your power company charges you by the KW hour. I'll use
12 cents per kilowatt hour for example.

$0.12 x 1.656 = .1987
This rounds off to 20 cents per hour to run, so if you run the pump 6 hour a day,180 hours per month, the electrical cost would be
about $36 per month.

the total power used is 750 watts so multiply that by the number of hours in use say 60 hours a week
so 60 X 750 = 42000 or 4.2 kw hours X 4 cents per kw/h =418 cents or $4.18 per week X 4 weeks =$16.72
if you are a college student talk with a maths teacher and see if what I an calculating is correct but there is no way that the ac unit will cost $150.00 a month to run
you have to be careful here as to charge you for an ac unit , it has to be on a separate meter and I suspect that he is trying to get you to subsidise his electricity account outside of the rent costs which include power for the stove and hot water
as an example we run a 2.7kw ac for 12 hours or longer and the total household bill at 21 cents / kw hour ( we live in a country where the power is a major component of the household budget) is around $360.00 per month so I think that by comparison he is trying to rip you off
seek legal advice on the subject and if the rent payment includes electricity usage then he will need a separate meter to charge for the ac unit

12000 BTU = 3.5 kilowatts per hour. For comparison, this is roughly equivalent to two toasters.

Charlie

1.5 Hp * 746 Watts = 1119 Watts or 1.119 Kilowatts So this motor would use in one hour 1.119 kliowatts of electricity. Double that for 2 hours and so forth. If this motor ran for 10 hours. 10 x 1.119 = 11.19 KW. Multiply that by what you pay per kwh )kilo watt hour) and that is how much money it is costing you to run that motor.

To determine the cost of using this air conditioner, you will need to find out what your electric company charges per kw/h. This is the standard unit that electricity is charged for. Next determine the wattage of the air conditioner. This should be found on the unit name plate. If you can not find the wattage by the name plate, the take the voltage and multiply by the amperage, this will give you watts. Next multiply the wattage by 24. (watts per hour x 24 hours) Finally divide this number by 1000. This will give you the total Kw that the unit will use in a 24 hour period. If you multiply this number by the cost per Kw that will give you the operating cost of your unit for one day.
ex. electric company charges .25/Kw The unit uses 1000 watts 1000 x 24 = 24000 watts 24000/1000 = 24 Kw 24 Kw x .25/Kw = $6.00 day
Note: all figures shown above were randomly generated in my head, and have no correlation to your calculations. Hope this helps.

Electricity is charged by Kilowatts per hour - There is a very easy formula for you to determine how much electricity your unit consumes.

Locate a sticker on your unit, it will usually say something like 120VAC follow by a number with A....... example 120VAC (which means 120Volts alternative current) and 5A (5 amps). Locate those 2 numbers, multiply them together.

Here is the formula: V*A=W (Volts * Amps = Watts)

So example if you have 120V 4A, that makes 480 W !

Sometimes on some units it already says the wattage, expressed in W Example 100 W !

Once you determined the WATTAGE, divide it by 1000, that gives you your KILOWATTS.

So example, unit uses 400 W..... you will do 400 / 1000 = 0.4 KiloWatts / hour

Next, locate your utility bill and see how much they charge per Kw/h. Multiply your unit's Kw/h * hours per day operation * rate = the cost per hour !

Example

0.4 kh/w * 10 hours * 0.07 (7 cents) = 28 cents per day!

Typical Dryer Heater wattage is around 5,000 watts or 5KW multiplied by the amount of time you run it. For instance 5000 watts for one hour is 5 Kilowatt hours multiplied by your electric rate. This gives you a cost for running it for one hour.

However, your heater runs more when the clothes are wet but less and less as they dry. A thermostat turns the heaters off around 160 Deg and back on at about 135 deg for normal heat. As your clothes get closer to dry the heater reaches 160 faster and 135 slower so that the on time is continually decreasing.

All this cycling translates to a heater on time of about 70% total I'd guess. Even if your vent line was blocked your heater on time would decrease due to safety systems turning the heater off to prevent fires.

All that being said you can approximately calculate electricity use as 5 KW multiplied by the amount of time you ran it and that number multiplied by 70% to account for heater off time. For a 5000 watt heating element that would be 3.5 KW multiplied by your electricity rate per KW. Adding a 5 amp motor that runs all the time would make the figure about 4.1 KW.

If you're still following me you need to keep track how many hours you dry clothes for the month and multiply the final number from above by that.

Let me point out the things that use a lot of electricity and you can hopefully pin down one or two you can affect. The things that use the most power have heating elements in them:

1. Stove
2. Dryer
3. Electric Heating
4. Air Conditioner
5. Electric Water Heater
6. Dishwasher with heated water and heated dry
7. Refrigerators and freezers with self-defrost feature

Keep in mind that having company for a week or lots of family members will affect all the numbers. Your utility company usually offers a free (part of the rate structure) service that will help you track down high usage if you have an unusually large bill. Consider asking their assistance.