You can also turn on the vehicle and check the voltage at the battery terminals. That cable that connects battery to power will be 3/0 or 4/0 AWG. Can A Bad Battery Cause A Check Engine Light To Come On. Once the engine fires, the alternator takes over and provides the juice. From this, we can conclude that the battery gets charged slowly at idle and it would be the wiser decision to not place a high electrical drain when it is idling.eval(ez_write_tag([[336,280],'carcareportal_com-medrectangle-4','ezslot_10',110,'0','0'])); Yes, the alternator does charge the battery in your car but it must fulfill two criteria: The engine basically turns the serpentine belt which in turn moves the alternator. Having said that, it is highly possible for you to face a situation where you have kept the car idling to let the battery charge. Otherwise, you can always take it around for a spin! You would have never imagined that it would be lying around as this, did you? For instance, installing a power amp that draws 70 or more amps in a car that shipped from the factory with a basic stereo, could cause huge problems if the alternator is only capable of putting out 60A to begin with. Hopefully this will stop people from telling me how many amps my alternator needs to produce. ADDITIONAL: The photo helps lots. 1 hour times 100 amps 100Amp/Hours. How long should I let my car idle to charge its battery? How to remove scratches from black plastic bumpers. You can sign in to vote the answer. (see formula above). Since I don't know what the internal resistance would look like at 50%, I can't begin to guess at the internal resistance without doing a bunch of tests. A battery can be hooked up to shore power with a home extension cord in the same way that it is hooked up with a 30 amp or 50 amp plug. Charge Voltage As you can see in the table above the recommended charge voltage is 14.0 - 14.4 Volts Most alternators will not be able to get the battery to that voltage until the battery is nearly full. Normal Output An alternator should put out between 13.5 and 15 volts of power. This is a fact known by most car owners. Alternatively, the battery could be taken out and charged with a 12-volt battery charger inside your home. Still have questions? The battery in cars with more power might well be dead in two weeks, like a BMW or a Mercedes where the components of the car need the power to survive. Alternator is 220 amps. The typical alternator on a motorhome or tow rig engine can charge batteries at from 40 amps to 100 amps. Main connection will be to positive charging battery terminal. Wish I could post a picture of what I want to do. Chargers generally have a defined max output. Realistically speaking, a flat battery can be charged up to 80 percent in 2 hours. A 3000 watt inverter can only deliver 1,200 Watts @ 120 VAC using your vehicles existing DC charging system. However, if there is an alternator installed, the battery should be disconnected. The battery will demand a lot of current because of the fact that it has been discharged. Well, you have deserved it, but what can you do about your car?eval(ez_write_tag([[468,60],'carcareportal_com-large-leaderboard-2','ezslot_2',113,'0','0'])); You can use a smart charger which gives your battery exactly the charge it wants. For example, if you have a 100 amp alternator and are using 80 amp, the voltage will be about 13.5V. A battery lasts for about 5 years. Determining how many amps to charge a car battery is a matter of subtracting the current capacity from the total capacity. Without knowing what ratio that occurs at, one can only guess. This is exactly what I want to do to my truck. 1. 12.8 volts is considered 100% charged. The DC battery and alternator must supply the DC AMPS. As for voltage, I already know the typical battery voltages of a car battery at static rest (12.5 volts) and the float voltage (13.6 volts). Starts with a good design AND a good understanding of the numbers. However, unless your battery was on its last legs, it may be recharged and give you many years of good service. A 4 amp charger can charge a 50% discharged small car battery (200-315 CCA or RC 40-60) in about 6 to 7 hours, a mid-sized battery (315-550 CCA or RC 60-85) in 7 to 9 hours, or a large car battery (550-1,000 CCA or RC 85-190) in 9 to 17 hours. Next you may select less or you battery may only accept the charge in amps it can handle. Get your answers by asking now. A car alternator needs to be putting out at least 13-14 volts (ideally between 13.8 and 14.2 volts) to effectively charge a 12 volt car battery. So when I recharge it - how much current will it draw to recharge? Voltage regulators were once a troublesome part of the alternator, most late model cars now control voltage using computerised control modules. at 75%, your voltage will be about 9.6 volts with an internal resistance of 1.3 ohms. Check the alternator gauge. I know my alternator is rated for 60 amps, but I'm sure that is to not only charge a battery from various states of discharge but also to maintain all other electrical needs of the car, so I don't think it's going to be 60 amps. Thereof, how many amps do I need in my alternator? The engine must be running (even at idle, the engine runs). so, the alternator produces 100A (amps,),and the battery has a capacity of 100Ah (amp hours.) When the battery voltage is low the alternator regulator will allow the alternator to produce more amps which triggers the voltage regulator to turn the alternator on. Since ohms law predicts that as current drops internal resistance goes up. When you start a engine, at the same time Alternator rotates with the help of engine power. You mention using the top 20% of the battery in reference; well, at 25% discharge (or 75% charge remaining (or State of Charge (SOC))) your TYPICAL battery internal resistance is 1.3 ohms (TYPICALLY).
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