how long should you run your car to charge battery?
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If your car does start, let it run for a few minutes to help charge the battery further. Unhook the clamps in the reverse order of how you put them on. Be sure to drive your car for about 30 minutes before stopping again so the battery can continue to charge. Otherwise, you might need another jump start.
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You don't need to drive the car around to charge the battery, you can just start the engine and leave it running for 5-10 minutes. Another thing which might help is getting a kill switch for the battery, basically a physical switch disconnecting the battery when you're done driving the car.
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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.
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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.
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You will want to drive it about four hours to get near a full charge. Ten minutes before you drive it, in case it stalls. At least half an hour to insure it starts the next morning but this isn't long enough to completely charge the battery. You will want to drive it about four hours to get near a full charge.
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If you're not going to be driving that often, just idling the car will do your battery more harm than good, Brown-Harrison says. "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.
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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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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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Your car battery is charged by your alternator. Often, when a battery fails, it's due to a fault with the alternator. Generally, if you can keep your engine RPM up, your alternator will charge your battery at a faster rate. If you are driving on a motorway, you should be able to charge your car battery in 30 minutes.
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Recharging a dead car battery can take at least 4 hours, and even up to 24 hours depending on the power of the charger and the size of the battery. Usually, battery chargers put out around four amps, but there are more powerful chargers out there.
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Charging a mid-sized car battery with a typical charge amp of around 4-8 amperes will take about 10-24 hours to charge it fully. To charge your battery to be able to start your car, it would take around 2-4 hours. You can charge your car battery fast, but it may cause damage to your car battery.
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20-25 miles, if the alternator is completely dead and not charging it. You may be fine if your alternator is working OK. It should keep the engine running once it has been started. But if your battery is dead because it isn't being charged by the alternator, then 20-25 miles max.
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While it would take you a full four days of charging on a 120V plug to fully charge the car, if divided into a complete work week, that relates to a rather good minimum 125 miles of added range, just based off your overnight home charging - per week.
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The battery's job is to start the car, and the alternator keeps it running.” Gunning says an alternator typically lasts about seven years, or about 100,000 to 150,000 miles, adds Waits. Some mechanics, though, say they typically see alternators last about 80,000 miles.
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On average, most batteries do not require a recharge for at least five years. That's if you're taking good care of your car. Frequent recharges indicate that your car battery is of poor quality or that you are not taking care of your car as well as you should.
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A 12-volt battery could take up to 12-24 hours to charge fully. When recharging your battery, remember that if it gets too hot while you're charging it, you need to stop charging.
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The vehicle should be driven for at least 30 minutes to sufficiently re-charge the battery so it'll have enough power to restart the car after it's been turned off.