how many amps should a 12 volt car battery have?
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A typical car battery with 12 volts rating has a capacity of 48 Ah. It means that when fully charged, the battery can deliver one amp for 48 hours, two amps for 24 hours and so on.
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A car battery generally holds 48 amps, so it will take about 12 hours to reach a full charge using this voltage. This could be a good choice for charging your car battery to maintain a certain level for a long period of time.
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So therefore if the draw on the battery is very high eg 12v x 100,000 amps ( I would like to see the construction of this battery) = 1,200,000 watts. Eg when you start your engine your starter motor will draw a lot of electricity ( a starter motor is vertically a dead short.)
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The Average Amps Required To Jump Start A Car. Before we dive into the specifics, you should know that the required amps to start most car engines is 400 amps. This is mainly for small and standard size vehicles. But in the case of SUVs, Trucks, and cars with bigger engines, you will need about 1000 amps.
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When the battery is not being charged and not delivering charge to a load, this is the rule of thumb. 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.
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Watts is amps x volts. So if you have say a 600CCA (cold cranking amps) car battery, then it can provide about 600 x 12 = 7200 watts for a few seconds needed to start the car.
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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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A: Car battery voltage will change depending on its condition. When the engine is off the battery open circuit voltage is 12.9 volts.
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The 12 volt 200 amp hour battery in question has a total capacity of 200Ah X 12V = 2400 watt hours. If you use 1200 watt hours that's 50% of capacity and it's time to stop and recharge. To put that in reference to something familiar, headlights on a car are about 100 watts.
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when taking two 6 volt, 100 amp hour batteries in series, it becomes 100 amps at 12 volts. When in parallel, it becomes 200 amps at 6 volts.
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If your car battery is above 12 volts, go for a drive In general, if the battery is showing between 12 and 12.4 volts, it's safe to recharge it using your vehicle's alternator.
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Starting the engine will require 250 amps for a half second, and the most current a 1.5-volt AA battery can produce is 10 amps. Given the above, you'd need to start with a string of eight AAs to get your necessary 12 volts.
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Starter batteries are rated in Cold Cranking Amps (CCA), that is – the amount of electrical current (amperes) that a battery can deliver in 30 seconds at 0 Deg F (-18.5 deg Celcius) and at the same time maintain a minimum voltage of 7.2V.
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The key to long life for any battery is to make sure battery voltage doesn't drop below 12.4 volts. The combination of a significant parasitic draw and long periods of non-use can easily cause voltage to drop below 12.4 volts. When that happens, sulfation begins to diminish both capacity and performance.
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Modern electric cars usually have batteries with a capacity of 24 to 100 kWh – kilo-Watt-hours. That's a measurement of the energy stored in the batteries. One kWh means one thousand watts for one hour. So a 24 kWh battery holds enough energy to supply 24,000 Watts for one hour.
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A standard small car battery is about 45 amp/hours. That means that it will supply over two amps for 20 hours. A battery should not be discharged at a higher current draw, or asked to deliver more amps than its amp/hour rating divided by 10 in order to get maximum capacity out of it.
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Car Battery Voltage When the engine is running, that number should be between 13.7 and 14.7 volts. If the battery is reading at 12.4 volts, then it's 75% charged.