how to calculate your power consumption?
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['Device Wattage (watts) x Hours Used Per Day = Watt-hours (Wh) per Day.', 'Device Usage (Wh) / 1000 (Wh/kWh) = Device Usage in kWh.', 'Daily Usage (kWh) x 30 (Days) = Approximate Monthly Usage (kWh/Month)']
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Calculate Watt-hours Per Day However, electricity on your bill is measured in kilowatt-hours (kWh), not watt-hours. One kilowatt is equal to 1000 watts, so to calculate how many kWh a device uses, divide the watt-hours from the previous step by 1000.
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['3000 kWh divided by 720 hours = 4.16 (demand limit if at 100% load factor)', '4.16 divided by .60 = ~7kW.', '20kW multiplied by 720 hours = 14,400 Total kWh (if at 100% load factor) 3000 kWh divided by 14,400 Total kWh = 21% load factor at 20kW.']
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Divide the energy quantity, measured in kilowatt-hours, by this length of time. For example, if you are converting 0.25 kWh of energy: 0.25 ÷ 0.0556 = 4.496, or just under 4.5. This is the power rating in kVA.
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['kWh = P(W) × T(h/day) ÷ 1,000(W) kWh = 400 W × 4 hrs ÷ 1,000. kWh = 1.6 kWh.', 'Price = Electricity(kWh) × Cost(cost/kWh) Price = 1.6 kWh × $.12. Price = $.19 per day.', 'Monthly Price = $.19 per day × 30. Monthly Price = $5.70.']
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Divide the number of watts by 1000 to convert the number from watts to kilowatts. 60W divided by 1000 results in 0.06kW. Multiply the number of kilowatts by the number of hours the device will be used. If the device will be used for three hours, multiply 0.06kW by three to produce 0.18kWh.
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We estimate that a Wi-Fi router uses 2 to 20 watts, with 6 watts being average for a wireless router. Click calculate to find the energy consumption of a Wi-Fi router using 6 Watts for 24 hours a day @ $0.10 per kWh.
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One kilowatt is equal to 1000 watts, so to calculate how many kWh a device uses, divide the watt-hours from the previous step by 1000.
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['Divide the load power by 1,000 for a value in kilowatts. ... ', 'Divide the power of your battery (also in kW) by the figure obtained to get the charging time. ... ', 'First calculate your load power (P), by multiplying the voltage (U in volts) by the current (I, in amps).']
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The formula for kWh is watts multiplied by hours used and then divided by 1000. For instance, a 100-watt light bulb used for 10 hours would use one kWh. Add all of the kWh totals from your appliances to get an idea of your electrical load that you use every day.
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A watt equals a joule per second. If a smart phone uses five joules of energy every second, then the power of the phone is five joules per second, or five watts. The animation above demonstrates the difference between energy and power.
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calculate battery power of the UPS (ie battery voltage) * AH. time = (inverter efficiency * battery volt * AH)/load in watts)
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You can estimate the total running load by adding up the running wattages of all items to be powered. If the name plate show only amps and voltage the wattage can estimated by multiplying volts times amps to calculate watts. Amps times Volts equals Watts. The watts total divided by 1000 is kW.
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A fully charged cell phone plugged into the wall is consuming about 2.24 watts, or 60 percent of the power it consumed while charging. Even worse is a charged laptop that's still plugged in, which consumes 29.48 watts, 66 percent of the 44.28 watts consumed while charging.
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How do I calculate the maximum power that my electrical installation can supply? To calculate the maximum power that your meter can supply (expressed in volt-amperes), multiply the voltage (U) by the intensity (I) of the current that supplies your home.
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['fixture watts = bulb watts × bulb quantity.', 'kWh = Power(W) × Time(hrs) ÷ 1,000.', 'monthly kWh = kWh per day × 30.', 'price = kWh × cost per kWh.']
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Many Appliances Use Just as Much Power When Off Always leaving a laptop computer plugged in, even when it's fully charged, can use a similar quantity — 4.5 kilowatt-hours of electricity in a week, or about 235 kilowatt-hours a year. (Your mileage may vary, depending on model and battery.