how many amps does a 12v battery charger draw?
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A medium amp output 12 volt charger would be in the range of 20 to 50 amps or so, and be used for many applications using about 100 amp hours of battery and up, or applications with a constant amp load (power supply application).
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It is better to charge a deep cycle battery at a higher charge rate like 6-amps, 10-amps or higher. However, check you battery specifications for the proper charge rate.
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The “Ideal Charge Curve” Charge at a rate up to 20 percent to 40 percent of the batteries capacity in amp hours to a voltage of about 14.6 volts (gel: 14.1 volts). For example, a 200 amp-hour battery would be charged at 40–80 amperes.
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Volts / Watts / Amps Converter You have a 12 Volt power supply that delivers 1 Amp of current.
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The iPhone 7 can draw right around 2 Amps. Professional testing, as well as user testing has measured varied results - as much as 2.1A or down to 1.6A.
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It typically costs $30-$100 for a shelf-model standard charger designed to charge a 12V car battery, with prices depending on: charger weight and size; the number and output of charging modes (generally with a rapid charge varying from 25 to 500 amps, a fast charge of 10-25 amps and a trickle/maintenance-charge setting ...
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A reading of 12.65-12.77 volts means your battery has a full charge. 12.45-12.54 volts means you have a 75% charge, 12.24-12.29 is 50% charged, and 11.99-12.06 volts is 25% charged. 11.75-11.89 volts means your battery is dead.
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If this is the question you are asking, the answer is simple. Most modern battery-powered lawn mowers have 12amp engines – which means 12 amps of current is delivered constantly to drive the engine. This is sufficient for most home users.
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A basic charger usually charges at around 2 amps - and so needs 24 hours to deliver the 48 amps needed to fully charge a flat, 48 amp hour battery. But there is a wide range of chargers with different charge rates on the market - from 2 to 10 amps. The higher the charge output, the faster a flat battery is recharged.
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I.e. Assuming You have a typical full size auto battery, it is about 50 amp hours. To Calculate how much time You'll need to charge the battery with a 15 Watt solar charger You'll need: Calculate the Ampere per hour of the charger: 15 Watts /12 Volts = 1,25 Amperes.
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A Motorcycle charger supplies NO MORE than 7.5 Amps during the charging process. Make sure your charger is the same voltage (6 Volt or 12 Volt) as the battery you are charging.
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Power Inverter, 150 Watts. Plugs into the 12-volt lighter socket in your vehicle or boat. Coverts battery power into household AC power. Operate up to a 13" TV-VCR, camcorders, radios,musical instruments and satelitte equipment computers and other tools and DC appliances in your vehicle.
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Resting fully charged 12-volt batteries are around 12.8-12.9 volts, and flat dead ones are at 12.0 volts, so 12.4 volts on a resting battery means it's about 50% charged.
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['Plug in your charger to an electrical outlet. ... ', 'Turn on your voltmeter unit. ... ', "Take a battery or battery pack that's compatible to your battery charger. ... ", 'Check the readout on the voltmeter and see where the pointer is indicating to.']
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While we would routinely charge a 3000mAh NiMH battery at four or five amps, a LiPo battery of the same capacity should be charged at no more than three amps. Just as the C Rating of a battery determines what the safe continuous discharge of the battery is, there is a C Rating for charging as well.
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For a 12 volt, leadacid battery, the voltage measured between these two points should be between 11 and 13 volts. The closer the voltage is to 13 volts, the closer the battery is to being fully charged. The closer the voltage is to 11 volts, the closer the battery is to being “dead”.
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Firstly, it is important to test the voltage output of your vehicle's alternator to see whether you in fact need a DC – DC charger. If your vehicle is producing > 13.7-13.8 Volts then the majority of the time purchasing a DC – DC charger would in fact limit your charge rate to the second battery.