# How Many Amps Do I Need To Charge A 12 Volt Battery?

## How many amps does it take to charge a 12 volt battery?

A medium amp output 12 volt charger would be in the range of 20 to 50 amps or so, and be used for many applications using about 100 amp hours of battery and up, or applications with a constant amp load (power supply application)..

## Is 11.9 volts enough to start a car?

However, in practice, the normal voltage for most of the passenger cars can be in the range of 12.2-12.49V, which indicates an incomplete charge. A decrease in performance and the quality of the device begins in the case of reduction to 11.9V or less.

## Can you overcharge a battery with solar panel?

Even a small solar panel, hooked directly to a fully charged battery, can overcharge it.

## Does amperage affect battery life?

Are mobile phone batteries affected if they are charged with a higher amperage? … Common mobile phones of major manufacturers are able to handle availability of higher current from chargers, and will only drain what they are able to process. So your battery will not be affected.

## How long does it take to charge a 12v battery at 10 amps?

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. Of course you don’t have to get the battery to full charge to get it to start the car.

## How long can you leave a 10 amp charger on a battery?

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. Of course you don’t have to get the battery to full charge to get it to start the car.

## How long does it take to charge a 12v 200ah battery?

24 hours at the C/20 rate will fully charge a 200A battery, assuming it has dropped to 100% depth of discharge, or a terminal voltage of 10.7v. The lower output charger will happily do the job – it will just take 20 times longer, or around 480 hours. A lot depends on the state of discharge of the battery.

## What amperage should I charge my car battery at?

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. The higher the charge output, the faster a flat battery is recharged.

## How long does it take to charge a 12 volt battery at 1.5 amps?

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.

## Is it better to charge a battery at 2 amps or 10 amps?

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. The higher the charge output, the faster a flat battery is recharged.

## Can a completely dead battery be recharged?

A car battery is considered discharged when the voltage drops below 12 volts. While your vehicle’s alternator can keep a healthy battery charged, it was never designed to completely recharge a dead car battery. … Most of the time, you don’t even have to remove the battery from your vehicle.

## Can you overcharge a battery at 2 amps?

A: If you leave the charger connected continuously, even at a mere 2 amps, the battery eventually will die. Overcharging a battery causes excessive gassing — the electrolyte gets hot and both hydrogen and oxygen gas are generated. … Charging your battery at the 10-amp rate is fine to get your battery back into service.

## Should I charge my car battery at 2 amps or 6 amps?

In answer to your question, the six amp charger will charge your battery three times faster than the two amp charger. Six amps is stil a relatively slow charge and should be fine to use for a deep cycle battery. If your charger is telling you the battery is full, place a load on the battery before charging it.

## Do amps matter when charging a battery?

When Voltage and Amperage Matter This means checking the voltage and amperage on your charger to make sure it’ll work with your device. … You want the the voltage on your device to match the voltage provided by the charger. Likewise, amperage is just as important. Amps are the current that’s supplied to your device.

## Can I leave a car battery charger on overnight?

Even though there is no risk of overcharging with the use of a high quality charger, the battery should not remain connected to the charger for more than 24 hours. A full charge is usually achieved by charging overnight. … Even after a deep discharge, some chargers enable at least partial reconditioning of the battery.

## How long does it take a 6 amp charger to charge a 12 volt battery?

The voltage rose slowly and steadily and then flattened out at around 13.4V with the current dropping as well, after about 20 hours. (The battery voltage will be higher when the charger is connected and drop back a little when the charger is disconnected. This is to be expected.

## Does higher amperage mean faster charging?

For some older devices, the higher specced charger just won’t work at all, while newer devices will just charge faster. Ultimately, it’s really the amperage that determines how fast a charger will supply power to your device. … If you have a good, high amperage charger, you can cut down on your overall charging time.

## What happens if amperage is too low?

If for some reason your replacement power supply has a lower-than-required maximum amperage rating, you may end up with a burnt out or overheating power supply, and the device itself may not function.