Anonymous. Low ampere is better for maintenance charging of your battery over long periods. Double these times if the battery is fully discharged. Let’s get straight to point: camping generators may have a 12-volt output on them, but when it comes to the crunch, they are not designed to fully charge your batteries directly. Most smart chargers won’t pass current through their cables until a minimum voltage is detected first from a battery. We provide a complete line of LiFePO4 12V 100AH batteries for use in boats, solar panels, recreational vehicles, off-grid applications and much more. A 6 amp charger can charge a 50% discharged small car battery (200-315 CCA or RC 40-60) in about 4 to 5 hours, a mid-sized battery (315-550 CCA or RC 60-85) in 5 to 6 hours, or a large car battery (550-1,000 CCA or RC 85-190) in 6 to 12 hours. If this doesn’t work, you can repeat the process a couple of times for longer durations when connected to the donor vehicle. Forty amps will charge your car quickly and efficiently. How long does it take to charge a 12v, 200AH deep cycle battery with a 125 watt solar panel? Batteries will tend to overheat, overcharge, and “boil” electrolyte off when they are receiving an amperage greater than 25% of their total amp hour rating. A slower charge gives the plates in the battery more time with less stress to convert electrical energy from your charger into chemical energy. 12V at 200 AH is 2,400 WH which means it would take 4,800 WH to charge it from empty hence a 700 watt panel would take 6.9 hours however lead acid batteries do not like deep discharges so you would be better off using only 20% to 25% of it's capacity which at 25% would be 1.7 hours of charging. For a 200ah battery, if you are giving 1A (Ampere) supply, it’ll take 200hours to fully charge. If you have access to a smart charger, it’s best to hook your car battery to it as soon as possible to bring the battery to a healthy state. So you need 1200 / 250 = 4.8 hours of bright sunlight. If the battery is completely discharged, you will likely need to jump the battery from another vehicle for a few minutes first to give it a temporary spike in voltage so that a smart charger can recognize the battery. When your car's battery has been given a jump way too many times, it's time to start looking for a new one. This is a problem you might run into if you really let your car battery completely discharge. A standard 100 amp hour battery on a 15 amp charger at room temperature, will typically take around 5.33 hours to reach 80% capacity. If the battery is fully empty, then you just need to double these times to … If you are looking to maintain your car battery at a fully charged level then a low amp is preferable to a high amp charger. This leads to overheating, the boiling-off of the electrolyte or worse. An 8 amp charger can charge a 50% discharged small car battery (200-315 CCA or RC 40-60) in about 3 to 4 hours, a mid-sized battery (315-550 CCA or RC 60-85) in 4 to 5 hours, or a large car battery (550-1,000 CCA or RC 85-190) in 5 to 9 hours. It takes a long time to charge and will switch off automatically in some chargers once your battery is fully charged. You also have to take in mind of the kind of car battery. Larger vehicle batteries can be charged in 50 hours at 2 amps, or 10 hours at 10 amps. This is a great amperage to use when you are going to leave your charger connected to your battery for extended periods of time on batteries that are seldom used such as that antique car that is only driven once a month, the trickle charge on a smart charger will maintain the level of charge in the battery so that your car is ready to use when you want to take it out for a spin. You do also have to take a look at the size of your car battery and the battery type. 10 amps are needed for Deep Cycle Marine Batteries. Unless you knowingly have upgraded your batteries, I bet you have 100Ah or less in total, and a 100W panel will be enough to recharge your battery as long as it’s sunny. The same batteries could be charged in about 12 hours, 16 hours, and 24 hours with a 4-amp charge, respectively. It also increases the production of hydrogen gas (explosive) and hydrogen sulfide (H2S, noxious). A 20 amp charger can charge a 50% discharged small car battery (200-315 CCA or RC 40-60) in 1.5 hours, a mid-sized battery (315-550 CCA or RC 60-85) in 2 hours, or a large car battery (550-1,000 CCA or RC 85-190) in 2 hours. Please consult a certified electrician if there is anything you are uncomfortable with. If you are using a high amp charger then the charging process will be a lot shorter than when using a low amp charger. In this article, I will be covering how I calculated the numbers in my charts, what type of charger is best for charging your car’s battery, charging your car battery with the car’s alternator, and the length of time to charge a car battery when using commonly available chargers. Working with electricity can be deadly if you are not careful. If you need faster charging, you have to use more number/size of the panels so as to increase the current of the supply. They have to be overcharged to 106%. The real question should be how many hours would x watts solar panel take to charge 200ah battery Because its current that really determines how fast the battery charges, that means even a 40 watt panel would charge your battery, just that it would take longer . Thanks If you have two 100Ah batteries wired in parallel, you have 200Ah capacity. I think 5-amps is the sweet spot when it comes to vehicle batteries. If you’re looking for a solid charger and/or maintainer, I recommend this 5-amp charger from Amazon.  It is gentle on your car battery, can charge it overnight, and can be left connected indefinitely for long-term storage! Green = Safe Charger Amp Rating, Yellow = Use Caution, Red = Risk of overcharging / battery damage. First working with John Deere to reduce their impact on the environment, whilst building his love for writing in his spare time. Home Battery Bank is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com. Stage 1 of the SLA chart above takes four hours to complete. Simple you need at least C/10 charge current (20-Amps). The length of time it takes to charge your car battery is completely dependent on the size or amp of your battery and the amp of the car charger you are using. The additional 10% is to make sure that the battery is fully-charged. At 1 hour the battery voltage has only risen to 13.8V at a.2C charge rate. 15 amp chargers are starting to push the car battery past its ability to absorb all of the current from the charging process. Let’s take the 32AH battery. It might take an extra hour or two, but it’s worth it for a healthy battery. The standard Li-ion family has a nominal voltage of 3.6V/cell; lithium iron phosphate is 3.20V/cell. 40 amp chargers give off an amperage at nearly 100% of the estimated amp hours of a typical starting battery and may be hazardous and shorten the lifespan of your battery. Just taking a look at the selection at a big-box store, let alone a designated battery... What Happens If You Disconnect the Positive Terminal First? So, 6AH/5 hours = 1.2 amps per average hour from the 1.5 amp charger. 2. Bob Robinson has been a tool enthusiast and lawn care expert for the past 11 years. I’ve brought a few batteries back to life in this manner that were undetectable by smart chargers. Once that was done, you simply take any of the values, calculate the percentage of AH that needs to be recharged, divide it by 0.8, and then divide it by the number of amps of the charger. There are many possible issues that could lead to your car battery taking a long time to charge. So to recharge them from 50% would take 17 hours with a 100W panel. If you have 400 watts of solar, you will charge twice as fast. The purpose of this chart was to extrapolate what Schumacher (an actual manufacturer of battery chargers) provided. We hope you enjoyed our article on "How long does it take to Charge a car Battery with a 12 volt charger? Without doing so will result in a smart charger not recognizing a battery and current will not flow. The approximate amp hour range times are estimated below. Yes, they do but it isn’t an ideal way of charging a 50% or more discharged battery. You really should test your battery’s open circuit voltage with a voltmeter before you start charging to anticipate the time — especially if you don’t have a modern smart charger! A 2 amp trickle charger can charge a 50% discharged small car battery (200-315 CCA or RC 40-60) in about 11 to 14 hours, a mid-sized battery (315-550 CCA or RC 60-85) in 14 to 18 hours, or a large car battery (550-1,000 CCA or RC 85-190) in 18 to 35 hours. This type of amperage is used when using a trickle charger or just maintaining your battery at a certain level and not trying to get a quick charge to boost your battery and get it started. From dead (fully discharged) it would take a small car battery about 25 hours, a larger car or small SUV battery 32 hours, or a larger SUV and Truck about 48 hours to fully charge on a 2-amp charge. No, A car battery charger on trickle charge is too low to do the job. To do that with a MPPT controller requires 20 amps x 25 volts = 500 watts usin ginexpensive GT panels. Again with the faster charge rate that Lithium Batteries can accept even a 45-Amp Lithium Charger can recharge a 100-AH Battery, (100-AH divided by a 45-Amp charge rate) that would equal about 2.2 hours plus the extra time required at the end of the charge due to a lower charge rate, would equal an estimated recharge time of approximately 3 Hrs. This is not ideal if you are looking for a quick charge for your car, however it is the perfect charger to use for smaller batteries such as motorbikes or other smaller batteries. When using a 40 amp charger you must take care not to overcharge your battery so keeping it connected for long periods of time will damage your battery. Charging your battery with a four amp charger will take about 12 hours to get a full charge out of this low amperage. Yes, a trickle charger that is not a “smart charger” operating in “float” mode will eventually ruin your battery if left connected over time. The 12-volt smart charger needs measurable voltage in the battery to begin charging. Home Battery Bank is compensated for referring traffic and business to these companies. 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. It’s not recommended to use this large of a charger. How long will it take to charge 32 batteries of 12v by 200ah with 48v 23 amp inverter (the batteries are connected four in parallel) so far I have charged the batteries for 50 hrs but their charge … A 15 amp charger can charge a 50% discharged small car battery (200-315 CCA or RC 40-60) in about 2 hours, a mid-sized battery (315-550 CCA or RC 60-85) in 2.25 hours, or a large car battery (550-1,000 CCA or RC 85-190) in 2.5 hours. And How long to charge a deep cycle battery? When the BMS senses the temperature is below 25 degrees F, it will not let the battery accept a charge. There are two main reasons why: First, the chances are your generator’s DC outlet is limited to a current of about 8 amps maximum. Source(s): long charge 12v 200ah deep cycle battery 125 watt solar panel: https://biturl.im/KGBev. As an example, a 100Ah battery must be cut-off any time charging current minimized to 3A. In fact, I would stay in the 2 to 8 amp range. Limitations to these results could be from any of the following: internal resistance, heat, the age of the battery, the specific gravity of each of the cells, the sulfation level on the plates, the true output of the charger, and more. 30 amp chargers give off an amperage at more than 50% of the estimated amp hours of a typical starting battery and could be hazardous and shorten the lifespan of your battery. The reason your smart charger won’t begin the charging process is because of its built-in safety feature. Can this system provide 1500watt-hour during the day and another 1500watt-hour during the night 2. This slowly evaporates the electrolyte through electrolysis (overcharging). Knowing how long you might be without a vehicle and making plans around that might make your day a little better though. Structural damage to the battery is a great possibility. A 1.5 amp trickle charger can charge a 50% discharged small car battery (200-315 CCA or RC 40-60) in about 15 to 19 hours, a mid-sized battery (315-550 CCA or RC 60-85) in 19 to 25 hours, or a large car battery (550-1,000 CCA or RC 85-190) in 24 to 46 hours. How long to Charge a car Battery at 4 amps? Structural damage to the battery is a great possibility. Double these times if the battery is fully discharged. If you’re going to do it, try to leave the car running for at least 20-30 minutes and turn off all unnecessary accessories (AC, radio, lights, etc.). Anything at 50% or below will shorten the lifespan of your battery. Usually, a mid-sized car uses a battery of the size 40-80Ah. A 40 amp charger can charge a 50% discharged small car battery (200-315 CCA or RC 40-60) in about 45 minutes, a mid-sized battery (315-550 CCA or RC 60-85) in 1 hour, or a large battery (550-1,000 CCA or RC 85-190) in 1.5 hours. If you’re in a hurry though, you can simply click on your charger’s amp rating below for a brief answer or and you can cross-reference your charger with your battery in the charts below for a wider range of charging times. Double these times if the battery is fully discharged. Disconnect the battery to get an accurate reading with the voltmeter and to reduce the risk of hurting your car’s electronics when charging in case your battery has an internal short. 40 amp chargers give off an amperage at 100+% of the estimated amp hours of a typical starting battery and might be hazardous and shorten the lifespan of your battery. So, make sure you choose the correct charger for your battery. 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