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The first step in determining the actual charge time is checking out the amp hours on your battery. This is done by first figuring out its reserve capacity, which may be found in the manufacturer’s guide or user manual of the battery. [links]
Open circuit voltage means the voltage rating of a battery when it on “zero load” or when it is not connected to any circuit. This can easily be measured by a voltmeter. However, one must make sure not to charge the battery before measuring. more
This is mostly a question that focuses on charge time, because determining how long to charge a battery is important so that you can schedule tasks in line with when the task finishes. here
The question of what charger to use is anchored on the amp hour— a measurement of energy output used in batteries. Automobile batteries commonly have a capacity of 48 amp hours. This means that it can deliver 1 amp per 48 hours, or 2 amps in 24 hours, 8 amps in 6 hours, and so on. here
Regardless of whether you will use a 2 amp or 10 amp chargers for your car battery, there are standard steps on how to determine the charge time. Now, if you are curious about the 2 amp or 10 amp preferences to determine which one is faster, or which one is just more efficient in general, an understanding of charge time is useful knowledge. more
You can derive the battery’s amp hour ratings by multiplying the reserve capacity by 0.6. For example, if the reserve capacity is 100 minutes, then 100 multiplied by 0,6 is 60. This means that your battery contains 60 amp hours.
If it was very flat, charging is likely to take a long time; check periodically with a hydrometer, while continuing the charge. [links]
The loads imposed on your battery may be gauged from the amount of current used by the various electrical components: headlights take about 8 to 10 amps, a heated rear window about the same. more
However, if the car has an alternator, disconnect the battery terminals beforehand: otherwise some alternators - generally the older type - can be damaged. here
Plug the charger into the mains and switch on. The indicator light or gauge ( ammeter ) will show that the battery is being charged. here
There are also causes other than short trips and cold weather which can affect the state of your battery. Failure is more common on cars equipped with a dynamo rather than an alternator , because the alternator produces more electricity and charges better at low engine speeds (See How the charging system works ). more
The typical car battery has a capacity of close to 48 amp-hours. This means that when the battery is completely charged it will deliver 1 amp for a period of 48 hours, or 2 amps for a period of 24 hours, or eight amps for a period of 6 hours. The different components you use while your car is in operation will increase the number of amps you need for the car to function.
It takes about 48 amps to operate the vehicle headlights for about 8 continuous hours. It takes about 48 amps to operate the starter of the engine for a continuous ten minutes. A heated rear window will use up to 48 amps in about 12 hours.
Having a battery charger that is automatic will help you to prevent damage to your battery. Overcharging a battery can cause the plates to buckle also, but when you have a fully automated battery charger the device will sense how much time the battery needs to charge, and it will provide the maximum amount of amps per hour until the battery is almost fully charged. [links]
Other chargers, such as Pulse Tech or Battery MIND er removes sulfation with high frequency pulses, not voltage pulses. This is safe, harmless, and effective in restoring battery life when used regularly.
Two questions: Do you see any holes in my plan, and for the charger is my best option to get as many amps as I can afford? here
BatteryStuff Tech We do not sell HP chargers. I do not know where you can find one. [links]
Clever Survivalist Nice article because of simplicity. It is a great starting point for people that havent done alot of research, but for me, I had most of this info already. thanks for the article. more
Paul I have a 2 amp 12 volt battery sealed lead acid can I use a charger that have 4 amps 12 volt auto shut off
BatteryStuff Tech We get this question quite a bit, so don’t worry about being confused! The first thing you need to figure out is how your going to run a CPAP machine off a battery. Are you going to use the inverter? Using an inverter is not my first choice as they draw more out of the battery, than going straight off the battery. If you look at your 3rd power rating it tells you the CPAP Machine can run directly off a battery with a rating of 12VDC, which is a 12 volt battery, and it will pull 6.67 Amps an hour. Now you may think that is more amperage than using the inverter, which draws 100-240VAC @ 2.1 Amps. However, when you calculate that back to the battery it is pulling 23.18 Amps an hour! So going off the battery is a better choice! You will most likely have to contact the CPAP manufacturer for a 12v accessory meant to run the machine directly off the battery, but it is far more efficient.