how many volts should a car battery have to start a car?
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Fully charged automotive batteries should measure at 12.6 volts or above. When the engine is running, this measurement should be 13.7 to 14.7 volts. If you don't have a multimeter to tell you the voltage of your battery, you can do a test of your electrical system by starting the car and turning on the headlights.
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Car Battery Voltage When the engine is running, that number should be between 13.7 and 14.7 volts.
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To charge a battery, a charger or your car's alternator needs to raise the voltage across the battery posts. Normal charging voltage needs to remain below about 14.4 volts, which is the level at which gassing of hydrogen and oxygen starts.
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A fully charged battery will typically display a voltmeter reading of about 12.6 to 12.8 volts. If your voltmeter is showing a voltage anywhere between 12.4 and 12.8, that means your battery is in good shape.
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"Starting the engine draws 100 to 130 amps, and idling the car for 15 minutes might put back three or four amps," Brown-Harrison says. "If you're idling only for 15 to 20 minutes, the battery never truly gets recharged.
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Around 12.7v is a good indicator of a fully charged battery. Below 12.4 volts, the battery will need to be charged. If the engine starts, it may be worth going for a short drive and checking the battery voltage again on your return.
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What voltage is required to charge it? A: A 12V car battery can be safely charged over a range of voltages. It needs at least 12.9 volts to charge, but at this voltage the charge rate of an automobile battery is very slow. A car battery can be charged safely at high voltages as long as the battery is not fully charged.
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The rule of thumb number used for energy required for EVs in normal driving is 25 KWH for 100 miles. Large cars will need more and small cars will need less.
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Steps to Check Your Battery for Overcharging Once the vehicle is started without the introduction to a load (lights, radio, A/C and fan), the volts will rise to an average of 14 volts. If the multimeter reads higher than 14.8 volts, then the alternator should be checked for overcharging.
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For electric vehicles, this requires about 10 kWh of electricity (Most EVs average between 3 & 4 miles per kWh. Charging an EV at 40 A (9.6 kW) means it will take a little more than one hour to charge to the minimum required daily amount, compared to 1 hour and 20 minutes at 30 A (7.2 kW).
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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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Car Battery Voltage A fully charged battery should read 12.6 volts or above. When the engine is running, that number should be between 13.7 and 14.7 volts.
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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 good, healthy car battery should have no fewer than 12.6 volts. Because of the way lead-acid batteries discharge, it's important that you test the battery after it's been sitting for a period of time to get what's called the 'resting voltage'.
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You can test for proper cranking voltage with a voltmeter while—you guessed it—cranking the engine. The several hundred amperes of current the starter motor draws should pull the battery voltage down to a normal 9 to 10 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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Generally speaking, it is easier to start an engine in a warm environment than in a cold one. The rating refers to the number of amps a 12-volt battery can deliver at 0°F for 30 seconds while maintaining a voltage of at least 7.2 volts. The higher the CCA rating, the greater the starting power of the battery.