how much does it cost to keep a laptop plugged in?
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Completely charging a laptop will cost around 1 to 3 cents in electricity usage, depending on the size of the specific laptop's battery, as well as your electricity usage rate. Small laptops, such as notebooks, generally have a 30-50Wh battery capacity, costing 1 to 1.5 cents to charge.
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The cost in electricity is comparable to a small air conditioning unit, measured at about $200 annually. The Prius Prime takes 7.2 – 8.8 kwh to charge a fully drained battery. If you were to charge it every night for 365 days during off-peak hours (6.5 cents kwh) this would equal 57 cents a day and $208.05 annually.
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Plug in your laptop. Power on your laptop. Click the battery icon in the system tray and you should see that your laptop is plugged in and charging.
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Bargain USB lamp light! It's a USB lamp that is currently available at the great bargain price of 88 cents! Yes, less than US$1. The concept is simple, you plug it into a USB port on your laptop, desktop or even power bank and boom, it will begin working.
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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.
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Gaming PCs, the souped-up desktops and laptops used by enthusiasts, constitute only around 2.5% of the total user base, but they account for approximately 75 terawatt hours, or 20%, of the total consumed by laptops, desktops and gaming consoles. In all, the power bill for these gaming PCs comes to $10 billion a year.
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That's 105 watts x 10 hours/week x 52 weeks/year = 54,600 watt-hours, or 54.6 kWh. If you're paying 10¢ per kilowatt-hour, then you're paying about $5.50 a year to run your computer. That's quite a range, $5.50 to $631 a year.
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Since the battery is not being used while plugged in, it can take several hours for it to naturally lose that 5% without an active drain. So yes, it's OK to use a laptop while it's charging.
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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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Typically, a wall adapter or portable charger has to output at least 29-watts or 31-watts to give a laptop more power than it consumes by just being on. This, of course, will vary depending on how intensive your power consumption is.
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The average electricity cost in the UK is around 14p per kilowatt-hour (kWh). So, using a 3kW charger to fuly top up a Nissan Leaf with a 40kWh battery would take 13.3 hours, at a cost of £5.76. With the Nissan's quoted range of 168 miles, that amounts to just over 3p per mile.
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The average cost of electricity in the US is $0.1285/kWh, meaning it costs only $5.14 on average to recharge your Nissan Leaf to the full 149-mile range.
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Get reader for sticker shock: laptop batteries are expensive. Prices vary from one model to another, but it's not uncommon for new power packs to sell for $100 or more. I've seen some as high as $150. When you consider that brand-new laptops now sell for as low as $300, that can be a tough pill to swallow.
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Never charge your module using a wall outlet. Charge your module with the charging cable provided using a laptop or low voltage USB. Only charge your module for 1-2 hours maximum as charging anything more than 2 hours at a given time can result in overcharge and permanent damage to the module.
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The amps that computers draw fall anywhere between 0.25 and 2 or more. A desktop PC uses up to 1.67 amps per hour with the printer and speakers running. So, a computer that runs as long as eight hours a day needs up to 5 amps.
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The power consumption of a computer varies depending on whether it is a desktop or a laptop: A desktop uses an average of 200 W/hour when it is being used (loudspeakers and printer included). A computer that is on for eight hours a day uses almost 600 kWh and emits 175 kg of CO2 per year.
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And the answer is a quite simple “No.” For optimum battery use, and to get the most life out of your laptop battery, keeping it charged between 40% and 80% has been seen as optimum.