running 8 hours is a total of 97.92 amps. You may at times need to convert at times between maH and wH (milliamp-hours and W-h), with an ampere being the standard unit if electrical current. For example, your PC may, on average, be on for three hours per day. Once you know you that number and your battery's watt-hour rating, you will have the information you need to prevent surprise power outages.

Add up the watt-hours for each of the devices. There are a number of watt-hour calculators on the web that make it easy to determine total battery watt-hours needed. Watt itself is defined as Ampere X Voltage.

For each device, multiply the device watt rating by the average number of hours the devices is on for the set time period. This rating can be used as the watt rating for the device. He has been published in leading technical and business publications such as "Red Herring," "EDN" and "BCC Research." A kilowatt hour is a measure of energy used by an appliance if it were kept running for one hour. But what is that? The battery will last 2 hours. Watt ratings of appliance and electronic device are often listed on the product.

Consequently, multiplying power by a unit of time restores units of energy, and in modern societies, either the watt-hour (W-h) or the kilowatt-hour (kW-hr) is the most often used. Copyright 2020 Leaf Group Ltd. / Leaf Group Media, All Rights Reserved. Mark Stansberry has been a technical and business writer over for 15 years. There are a number of watt-hour calculators on the web that make it easy to determine total battery watt-hours needed. Actually, watts is the fundamental unit of power and watt-hours is the energy stored. If we want to calculate how much energy - so, in other words, how many watt-hours - are stored in a battery, you need information about the electric charge in the battery. One Watt hour is equal to one Watt of average power flow over an hour. Battery Cycle life considerations Using this calculation (24 amp hours X 9 = 216 amp hours) we conclude that this single bulb would stay lit for about 9 days on a fully charged 220 amp hour battery bank. The calculator will calculate the battery life if the Watt Hour and the battery voltage is known. For example, if your PC required 5 watt-hours per day and your fan required 5 watt-hours per day, you would need 10 watt-hours of energy per day. For example, if your PC was rated at 20 watts and was on three hours per day, it would use 60 watt-hours of energy per day. For each device, multiply the device watt rating by the average number of hours the devices is on for the set time period. His present writing focus is on computer applications programming, graphic design automation, 3D linear perspective and fractal technology. At that point the battery will be nearly depleated (to 10.6 volts). As an example, a 100 Watt light bulb on a 400 Watt Hour battery (like the Yeti 400) would last, on paper, 4 hours. The total number of watt-hours that your battery will need to supply over the set time period is equal to the sum of the watt-hours that each of your devices uses. A watt is defined as one joule per second and is the standard unit of energy in physics. So if a 5 Volt battery has 20 Watt Hour rating, and, it draws 2 Amp current, then the Watt delivered by Battery = 10 Watts (5 Volts x 2 Ampere). For example, if your PC was rated at 20 watts and was on three hours per day, it would use 60 watt-hours of energy per day. EV battery size is measured in kWh, or kilowatt hours. In short, watt-hours an amp-hours are … its capacity in ampere-hours (Ah). Wh are usually used to measure the energy consumption of a circuit or appliance. Multiply these two numbers to get the watt-hour rating (Ah × V = Wh). The actual energy your device consumes is a function of the amount of time it is on and the number of watts is uses. Further, if your electronic devices required 10 watt-hours per day and all of these devices needed to be powered for 10 days, the total watt-hours your battery must supply over the 10-day period would be 100 watt-hours--that is, 10 multiplied by 10.

They then calculate the watt-hours for each device and then sum them. Watt specfications for appliances and electronic devices.

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