how many amps do you need to charge a 12 volt battery?
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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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Normally, a deep cycle battery often holds 48 amps so if you charge it at 1 amp, it will take you 48 hours. Similarly, if you charge your car battery at 4 amps, the total time to make the battery fully charged is about 12 hours. Therefore, if you need a quick charger, a 4 amp charger is not a good option for you.
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These are technically all vector quantities, but since the power figure you provided is in watts (as opposed to volt-amperes), and the voltage is in RMS, then 12 watts = 120 volts x current (in amperes), or current (in amperes) = 12W/120V = 0.1 amperes = 100 milliamperes (mA).
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Electricity Consumed in Charging a Golf Cart The saved costs depend on how many kilowatts are consumed to charge the battery. For this case, let's take into account a 120 volt charger that draws 10 amps. Volts multiplied by amps yields watts as the product, so the result is 1,200 watts.
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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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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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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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first, the amps at which you charge the battery don't matter too much, as long as you don't have an excessive amount of current. all more amps will do is charge faster. But if you want the fastest charge for a nimh battery, you typically can just charge it at its mah rating, so 1.5 amps for a 1500mah battery.
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You need to connect an amp meter in series with the coil and 6 volt battery. A 6 volt coil will draw 4 amps. If you have an accurate ohm meter, reading across the posts of a 12 volt coil should be about 3 ohms. A 6 volt coil is about half of that.
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Amp-hours (at 12 volts) = watt-hours / 12 volts = 1470 / 12 = 122.5 amp-hours. If you are using a different voltage battery the amp-hours will change by dividing it by the battery voltage you are using.
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The typical furnace will draw about 8 amps of power. It is a good idea to have solar or generator power to supplement the charging of your batteries when not connected to shore power. The 12 volt battery system in your RV runs many of your electronics on your Camper, RV, or Travel Trailer.
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A trickle charger usually operates at around 2 amps and it is going to take a long time to charge up your 12 volt car battery (read our full guide here). It can take as long as 24 hours to get the battery up to an acceptable charge, depending on how depleted your battery is when you start charging.
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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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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.
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For round numbers takes a 150 amp deep cycle battery. Charge it at 10 amps, you will need to charge that battery for up to 15 hours to fully charge as it puts up to 10 amps in each hour. It's never good to over charge a battery, as your solution will start to boil out.
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The energy used to charge rechargeable batteries usually comes from a battery charger using AC mains electricity, although some are equipped to use a vehicle's 12-volt DC power outlet.
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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.