28th November 2019
How many amps do I need to charge a 12 volt battery?
e.g. 24 WATTS / 12 VOLTS = 2 AMPS CHARGER CURRENT REQUIRED = 26.4 AMPS + 2 AMPS = 28.4 AMPS. 8. Choose the next biggest charger in the range e.g. 12 VOLT, 30 AMP, 3 BATTERY BANKS = BCM 12/30-3 Note Much too big a charger could damage the battery and too small will take longer to re-charge.
Likewise, people ask, what is the charging rate for a car battery?
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.
The only difference is in the amp hour capacity verified by the slight weight difference. Now most people choose to upgrade their 12V 4ah battery to the 5ah version. But if you wanted to save a little cash, or the 4ah was all that was available you could replace a 12V 5Ah battery with the 4 amp hour one.
A car battery usually holds 48 amps so if you take that it charges at approximately 1 amp per hour you can work out how long it will take to charge your battery with various amperage chargers. Charging your battery with a four amp charger will take about 12 hours to get a full charge out of this low amperage.
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.
This means that a battery has a 100 A.H. capacity if it is discharged over 20 hours, or at about 5 Amps-per-hour (100 A.H. / 20 hours = 5 Amps DC). However, this same battery would last only one hour if the discharge rate was 50 Amps-per-hour (50 Amps DC x 1 hour = 50 A.H.) because of the high rate of discharge.
"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. "If you're idling only for 15 to 20 minutes, the battery never truly gets recharged. So each time you start and leave it to idle, the charge will get lower and lower and lower."
Do not use gel or gel/AGM settings, as they will not fully charge an OPTIMA battery and could damage it over time. However, even some AGM-compatible chargers will not recharge deeply discharged (less than 10.5 volts) OPTIMA batteries. For regular charging, we recommend a maximum of 10 amps, 13.8 to 15.0 volts.
Float voltage is the voltage at which a battery is maintained after being fully charged to maintain that capacity by compensating for self-discharge of the battery.
So it will take more than 30 minutes to 1 hr to reach fully charged condition from a typical worst case of 70% state of charge of battery. But in a high way drive cycle with high rpm ranges the alternator will generate high amperes and battery will be more than 95% with in 30 minutes.
Cca ratings are how many amps the battery can deliver to starter motor if an average car has a capacity of around 48 amp hours which means that, fully charged, it delivers 1 for hours, 2 24 8 6 and so on best answer most batteries called 12 volt, although when running, go as high 14 volts.
Deep Cycle AGM:- AGM batteries should be charged using a charger with a mode switch for AGM type batteries. It is recommended to use a charger, current limited to 20% or 0.2C of the batteries capacity at a charging voltage of between 14.6 – 14.8V following deep cycle use, or 13.6V – 13.8V for standby use.
An ampere hour (abbreviated Ah, or sometimes amp hour) is the amount of energy charge in a battery that will allow one ampere of current to flow for one hour. An ampere is a unit of measure of the rate of electron flow or current in an electrical conductor.
The key is to use the watts you know to calculate the amps at the battery voltage . For example, say you want to run a 250 watt 110VAC light bulb from an inverter for 5 hours. Amp-hours (at 12 volts) = watt-hours / 12 volts = 1470 / 12 = 122.5 amp-hours.
While a battery that allows a car start at the first turn of the key is a joyful thing, it doesn't last forever. In fact, depending on where you live and how you drive, the condition of your charging system, and a number of other factors, a battery lasts about four years on average.
Two Batteries in Parallel, One Charger. Batteries connected in series strings can also be recharged by a single charger having the same nominal charging voltage output as the nominal battery pack voltage. This 12-volt battery pack is connected to a single 12-volt charger.
Make 2-3 back to back appointments, and ask the genius to replace the battery within that time. That should give 30 or 45 minutes to do the battery replacement. And it should really only take about 10-20 min including the paperwork.
Large automotive-type battery chargers, designed to charge a good-sized car or truck battery, can easily overcharge a small motorcycle battery if you're not careful. Unfortunately, in some circumstances, that may be the only type of charger available. Yes, it's a pain, but it's better than cooking your battery.
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.
All you need to perform the test and check if your alkaline batteries are juiced is a hard surface. Drop each battery (with the flat, negative end down) from a couple of inches up. If the battery is charged, it should make a solid thud and most likely stay standing.
Gel cell batteries are deep cycle batteries that contain an electrolyte which is suspended in a gel solution between lead plates. You can recharge a gel cell battery with a gel cell battery charger. Constant voltage charging is one of the best charging methods, which you can accomplish in one of two ways.