how many amp hours does a 12 volt car battery have?
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A very small user of power is a 1.2 watt LED light running on a 12 volt power source will use 1.2W / 12V = 0.1 amps. Therefore a 100ah (amp hour) battery will last for 1000 hours. A slightly different example is a 60 watt fridge running on a 12 volt power source uses 60 /12 = 5 amps, but only while the motor runs.
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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 batteries provide 12.6V DC (direct current) through six cells, producing 2.1V each. Anything under the 75% charge rate, or about 12.45V, generally indicates the battery is undercharged and will need recharging.
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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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If you max out the inverter at 2000 watts, you are pulling 2000 watts /12 volts = 166.6 DC amps per hour. If you use a 200 amp 12 volt battery you would divide 200 amp battery / 166.6 amps = 1.2 hours of run time.
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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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2V is usually a lead acid single cell. ... a “12V” lead acid battery is really just 6 2V cells in series.
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Amp-hours are calculated by multiplying the number of amps (A) a battery provides by the discharge time in hours (h). So, if a battery provides 10 amps of current for 10 hours, it is a 10 amps × 10 hours = 100 Ah battery.
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The internal chemistry of the battery will also affect the amp rating. Most car batteries have a capacity between 550 and 1000 amperes. Matters are further complicated by the fact that you'll see two-ampere ratings on most batteries: the crank amps (CA) and cold cranking amps (CCA).
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They both reflect different performance characteristics of the vehicle. The same holds for CCA and Amp-hours: CCA is how much current the battery can supply in a short amount of time (usually 30 seconds), Amp-hours is how long the battery can output a certain current.
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A 12-volt automotive battery, for instance, takes a while to charge. In fact, fast charging for this kind of battery is not recommended. 10 amps are the recommended current.
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Car batteries range from 40AH to 110AH, and alternators range from 45 amps to 200 amps. If you are using a battery charger, a 10 amp charger will take 4 to 11 hours to fully charge the battery, a 2 amp charger will take 2-4 days.
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Vendors generally say a 650mah battery will last 4-6 hours. capacity if it is discharged over 20 hours, or at about 5 Amps-per-hour (100 A.H. /20 hours = 5 Amps DC).
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For example, a typical full-size auto battery is about 50 amp hours, so you would choose a 10 amp charger that would take about 6 hours to recharge it if the battery were completely dead. Another instance would be a marine deep cycle battery rated at 100 amp hours.
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And while it may seem like a good idea, running your vehicles engine five minutes a day is not enough to maintain your car battery. To maintain the charge in your vehicles battery you need at least 30 minutes of driving - depending on the vehicle and the battery age. However, we recommend using a battery charger.
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A 12 volt NOMINAL voltage battery should read 12.5 at full charge if it reads 12 it is about 25% charged. This can be enough to start it depending on the age, size of the battery and how much cranking the car needs.
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The standard automotive battery in today's vehicles is a 12-volt battery. Each battery has six cells, each with 2.1 volts at full charge. A car battery is considered fully charged at 12.6 volts or higher. When the battery's voltage drops, even a small amount, it makes a big difference in its performance.