A 1 horsepower motor typically draws around 10 amps at 120 volts and 5 amps at 240 volts. The actual amperage can vary depending on the efficiency and design of the motor.
( 746 watts = 1horse power ) On 12 volt systems ( volts X amps ) =( watts )12volts X 6.5amps = 78watts. Now ( watts / 746watts ) 78watts / 746watts =0.105hp
at least 1500 watts, 1horse power is 746 watts, therefore 1/2 horsepower is 373 watts. But the answer will depend on the %age efficiency of the motor in the pump. Assuming an efficiency of 50% 746 watts would be an appropriate answer.
The amount of space you need will vary according to several factors; size of the horse, local zoning laws, and how your property is set up.1. Pasture only; If you keep your horse on pasture only you'll likely need 2 acres divided into two 1 acre paddocks so that they can be rotated. If you have miniature horses then 1 acre should be plenty.2. Stabled partially; If you'll keep the horse in a stable for part of the day or night, then you can get away with about 1 acre of pasture so long as it's allowed to rest and is properly maintained. You can also provide a run/ pen off of the stall to allow the horse to go in and out.3. Drylot; If the horse cannot have grass for medical reasons, but you still want to turn the horse out, then a drylot of at least 40 feet by 100 feet is recommended. 40 feet is as narrow as it should get as this allows the horse to get into a gallop and turn at speed. 400 square feet is the minimum square feet per horse, so if you have multiple horses in one drylot you'll need 400 square feet per horse.