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How many watts are needed to power a prius for an hour?

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Old 16 Jul 2010, 11:35 pm   #1 (permalink)
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Default How many watts are needed to power a prius for an hour?
How many watts are needed to power a prius for an hour?
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Old 16 Jul 2010, 11:40 pm   #2 (permalink)
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You have to clarify what the car is doing for that hour to get a good answer. If it is just sitting still in READY mode without the A/C on it would be a couple hundred watts to keep the ECUs and coolant pumps powered.































If it is on the highway doing 60 MPH and getting 60 MPG it would be using 1 gallon of fuel per hour. Since E10 is 112,000 BTU per gallon and there are 3.41 BTU per watt-hour the watts would be 32,845.































Watt is a unit of power















watt-hour is a unit of energy (power over a specified time period)
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Old 16 Jul 2010, 11:44 pm   #3 (permalink)
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There is no definite answer because of the range of demands on the system. At 30 mph, for example, the car gets about 60 mpg. That means it will burn about half a gallon of gasoline which provides about 60 MJ energy gross, at about 30% efficiency. That translates to 20 MJ, or 20,000 kW-seconds. It comes to roughly 5 kW for that hour. Twice the speed cuts into the fuel economy a bit and requires about 10 kW for the half hour to go the same distance. In very round figures that is about 5 kWh to go 30 miles.































en.wikipedia.org
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Old 16 Jul 2010, 11:48 pm   #4 (permalink)
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Here's a little help. There are 750 watts per horsepower. Do the math.
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