jsilva
Member
- Location
- Rhode Island
I need help on the kilowatt-hour formula, I need to install a motor and I want to know how much money we would save if we turn it off for about 6 hours a day.
KILOWATT-HOUR
- Thread starter jsilva
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bphgravity
Senior Member
- Location
- Florida
Re: KILOWATT-HOUR
Cost = Watts x hours used x cost per Kwhr / 1000
Cost = Watts x hours used x cost per Kwhr / 1000
- Location
- Lockport, IL
- Occupation
- Retired Electrical Engineer
Re: KILOWATT-HOUR
25% ? (Sorry about that vain attempt at humor.)
Ok, it depends on how precise you need your answer to be. It also depends on what you already know. Here?s a simple, but not extraordinarily precise method: Take 75% of the motor?s horsepower rating (gives you KW), multiply by 6 (to get KW-Hr), and multiply by your utility rates ($ per KW-Hr). That is one day?s worth of savings.
This method includes several simplifying assumptions. But you didn?t give many details, such as what the motor does for a living or how it is used (e.g., runs a conveyor belt at full-speed-full-time, or runs an elevator intermittently at less than full load). If you want a more precise answer, can you give us more information?
25% ? (Sorry about that vain attempt at humor.)
Ok, it depends on how precise you need your answer to be. It also depends on what you already know. Here?s a simple, but not extraordinarily precise method: Take 75% of the motor?s horsepower rating (gives you KW), multiply by 6 (to get KW-Hr), and multiply by your utility rates ($ per KW-Hr). That is one day?s worth of savings.
This method includes several simplifying assumptions. But you didn?t give many details, such as what the motor does for a living or how it is used (e.g., runs a conveyor belt at full-speed-full-time, or runs an elevator intermittently at less than full load). If you want a more precise answer, can you give us more information?
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