The lower the hourly watt load, the longer the battery will run. A 150ah battery may be limited to 1800 watts (12V) or 3600 watts (24V), but if you join it with other 150ah batteries, you can run as large a load as needed. 5A Constant Current and Constant Voltage LED Driver Battery Charging Module #JD. Here are some example power curves for a 12V PV (and it looks like it's approx 125W peak) panel, from altestore.com : You also need to know about the battery's characteristics as it charges: the heat losses, and how its voltage changes with temperature and % charged. There are several factors to consider here: the inverter efficiency, battery capacity, load and the prevailing conditions. The runtime depends on how many appliances you run at the same time. The technical storage or access is strictly necessary for the legitimate purpose of enabling the use of a specific service explicitly requested by the subscriber or user, or for the sole purpose of carrying out the transmission of a communication over an electronic communications network. 12v lithium battery is a lithium-ion battery that can store electrical energy and outputs DC current. The other is battery depth discharge. The same applies to your inverter. Energy = power x time. With power of 25 Watt = 25 A*V at V = 12 V you will supply 25/12 Coulomb each second (Amper*s). So if you are going to place a full load on the 150ah battery, do not expect it to last for an hour. This rule applies to any battery inverter system no matter the manufacturer. But this does not account for inverter efficiency. And there are free online GIS insolation resources to give you the raw source information to do detailed calculations yourself, such as the EU PVGIS database. AGM batteries are reputed to accept charge faster than conventional flooded lead-acid batteries. Assuming 8 hrs per day of sunshine, it would take about 4 days. Okay, so 24V batteries are more efficient than 12V. But by connecting two 12V batteries in parallel you increase the voltage to 24V. Fast charging also increases the battery temperature, and should be accounted for in charging voltage temperature compensation (see previous part). Connector, case, and wire. Set the charger's output current to no greater than the '0.7C' rating of the battery. For this, you need to check the current rating of the solar panel of interest. Pure sine wave solar inverter. Advertisementsif(typeof ez_ad_units!='undefined'){ez_ad_units.push([[320,50],'workshoppist_com-banner-1','ezslot_2',135,'0','0'])};__ez_fad_position('div-gpt-ad-workshoppist_com-banner-1-0');if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[320,50],'workshoppist_com-banner-1','ezslot_3',135,'0','1'])};__ez_fad_position('div-gpt-ad-workshoppist_com-banner-1-0_1');.banner-1-multi-135{border:none!important;display:block!important;float:none!important;line-height:0;margin-bottom:7px!important;margin-left:0!important;margin-right:0!important;margin-top:7px!important;max-width:100%!important;min-height:50px;padding:0;text-align:center!important}The standard 0.1C rate is a compromise between battery life and charging practicality: it is slow enough not wear or heat up the battery during charging, but fast enough to fill an empty battery overnight. Your own logo eg: silk print. For (1), you need the panel IV curve, typically presented on the manufacturer's datasheet. The size depends on the type of battery. These are just examples as TV power consumption depends on size. In this article, we will discuss these calculations in detail below. Only Sealed Lead Batteries (SLA) or Absorbed Gas Mat (AGM) batteries have a lower maximum charge rate. A 24V 150ah battery holds twice as many watts as a 12V. Charging at higher rates is often possible, but comes at a cost to battery life. A 2C battery would need just half an hour to load 100 Ah, while a 0.5C battery requires two hours. You can connect two 12V batteries in a series to get 24V. For lead acid batteries, recharge at 50%. With larger-capacity AGM batteries, the maximum recommended charging current cannot be sourced by typical battery chargers, and the charger capacity will limit your currents. The technical storage or access is necessary for the legitimate purpose of storing preferences that are not requested by the subscriber or user. Wide DC input range. Two 150ah units might perform differently depending on the design quality. You can use two solar panels of 200 watts each with this type of battery for charging it up via your solar energy system. As solar power is intermittent and the output of solar panels will be varying under different conditions, there should be a charge controller between the solar panels and the battery that can regulate the power input to the battery. But what if my system is designed for 12V? But increase that to 10 or 20 amps and the battery discharge rate quickens. While such a charge actually takes longer due to the slower absorption stage, the C-rate expression is useful in that it stays the same for all size batteries. Mastervolt, Mighty Max and UPG all give a maximum charge rate of 0.3C; Victron specifies a more conservative 0.2C or less preferred. Also, it should have enough capacity to handle at least 25 volts at the input side (at no load) because youll be using two 200-watt solar panels in parallel. Assuming battery input voltage 12v, a fully charged 150 AH can discharge 150 (AH)*12 (V) = 1800 Watt-hour ideally. As the battery approaches 100% state of charge, the maximum charge rate kicks in. A 24V 150ah battery holds twice as many watts as a 12V. If you skip the absorption stage, which is OK if done only occasionally, the charge time is cut to only 2 to 3 hours. See more details above. Mastervolt Lithium Ion batteries can be subjected to much higher charge currents. Power requirements vary so consider only what appliances you have to use. To realize our dream, we have created this website that deals with everything eco-friendly. Scope of application: 12V-4Ah-150Ah lead-acid battery (disabled for lithium . Add a new light switch in line with another switch? Ecofriendlyhow.com 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. A 150Ah battery has 12 volts at its terminal, so it can store 1800Wh of energy. . The proper charging rate for an AGM battery does not depend on the battery size in amp-hours; 10Ah and 100Ah both have 0.1C standard rate and 0.20.3C fast rates. You can top it off at 85%. " What size solar panel do you need to charge a 150ah lead-acid or lithium battery? First, its important to be aware of how much energy a 150Ah battery stores. If, at some point in time, the storage component's absolute state of charge is 310 Ah, then it has 40 Ah of unfilled capacity, so the highest charge current it could accept would be 40 Ah * 0.4 A/Ah = 16 A. How many transistors at minimum do you need to build a general-purpose computer? 5A Constant Current and Constant Voltage LED Driver Battery . However, this case makes at least two major assumptions, the battery is fully discharged and there are no losses of any kind! That datasheet will also tell you how output varies with panel temperature. How long will it last in this case? So, It can work for 10 hours at a 15A discharge rate. Note that absorption times much below 4 hours are enough in very shallow cycle duty, such as in continuously charged automotive and solar power systems. Can someone migrate this to electrical.stackexchange and make sure people don't have to see this question asked here? It is only a small amount though. As we have discussed, a battery can be charged at 15 amperes; therefore, you can choose solar panels that give you 7.5 amps and place them in parallel to make 15 amps total. In the real world, the battery will not be fully discharged and there are energy losses "everywhere." The question following this knowledge becomes what solar panel rating will be enough to give you 360 watts? The best . Be conservative in your estimate and assume the battery runs out of juice before that. It only takes a minute to sign up. A current of 10A into a 100Ah truck battery means a rate of 0.1C, but for a 50Ah car battery, its 0.2C. Maximum charging current The maximum current you should use to charge an AGM battery is, in most cases, the current that produces a 0.3C charging rate. So the power of your panel is 180 W. Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. But there could've some energy loss while discharge, so at 80% battery efficiency - it can deliver 1800 WH*80% = 1440 WH i.e It can provide 1440 watt current for 1 hour or 720-watt current for 2 hours. A discharge beyond DoD 90% damages an AGM battery and should be avoided. For more details, click here. Read the battery and inverter warranty so you have a full understanding in case a replacement is needed. We use cookies to optimize our website and our service. If there is no load running on the battery. With the depth of discharge expressed in percent and the C rate having units 1/h, the bulk charge time can be expressed. A 24V 150ah battery holds up to 3600 watts, which means you should use a 4000 watt inverter. The equation is: Dehumidifier for 2 hours (to run on solar panels. Sealed Deep Cycle Battery Brand/model: Sunpal 6GFM(G)-150 Type: Gel Battery Rated Voltage: 12v Number of cells: 6 Rating: 150ampere-hour @ 10Hr (C10) Chat to Buy . By knowing its capacity, you can rest easy because the system is running at optimum levels. DOD is depth of discharge, which is the level when the battery has to be recharged. This will not increase the amps though. This site also participates in other affiliate programs and is compensated for referring traffic and business to these companies. A 12V 150ah battery can store 1800 watts so a 2000 watt inverter is the right size. So a 150 Ah battery can supply 150A to the load for one hour. If your battery is the Li-ion type, it can be charged at high currents. Do not allow the battery to be fully discharged. If the manufacturer says recharge at this rate, do it. 150 Amper*hour is the battery charge capacity. If, at some other point in time, its state of charge was 335 Ah, then the highest charge current it could accept would be only 6 A. AGM batteries can technically be charged at even higher rates, well in excess of 0.3C. Refers to the 12V 5Ah motorcycle battery when the battery is dead. Lead-Acid Batteries: The recommended charging current (thus, the battery charger size) for lead-acid batteries ranges from 0.1C to 0.25C (10% to 25% of the battery's Ah rating). mexican names that start with e boy. If we are talking about hundreds or thousands of watts, the efficiency rating will make a huge difference. percent SOC to maintain that capacity by compensating for self-discharge of the battery. $6.37. One of the things you have to do is make certain that the inverter is large enough, in this case for a 150ah battery. With this knowledge, you will then be able to design a solar energy system that can charge your 150Ah battery to use as a backup electrical power source. How Many Amps Does a 25-Watt Solar Panel Produce? Therefore, a 150Ah battery stores 1800 Wh of energy within it, so you will need 1800 Wh of energy to charge your 150Ah battery using the solar panel. Assuming it is a 12V battery and good for 1800 watts, you can load a laptop, a TV, several lights, a fan and a small microwave. the slower charge the better battery, it seems charging current is around C/10 and <= 10A is more favourable to prolong lead acid battery. With a 300ah battery bank you can run a full inverter load and not worry about the depth discharge dropping below 50%. Run time = 480Wh/1000W = 0.48 hours or 28.8 minutes. Max. keep that in mind if you want to run something like an. You need about 200-300 watts of solar panels to fully charge a 12v 150ah lead-acid battery from 50% depth of discharge and 400-500 watts of solar panels to fully charge a 12v 150ah lithium (LiFePO4) battery from 100% depth of discharge in a day. A 12V also pulls twice as many amps as a 24V, depleting the battery faster. Selectable high power charging current. However, charging at such rates will cause severe wear and heating, is not safe and never recommended. A charge controller should also have the capacity to handle a minimum of 20 amperes at the output, 25 volts at the input side, and a regulated 14 volts (during charging) at the output. 4 Best Solar Panels for Blink Cameras for 2023, 4 Best Solar Panels for Teardrop Campers for 2023. Most AGM battery manufacturers also allow faster charging rates up to 0.2C0.3C for their AGM units. Bottom line: add up the watts of each appliance you want to run. (i.e. A 150 AH battery at C20, will last for 20 hours on a load of 7.5 A. . The most important difference is the voltage. A 150ah battery with a 1800 watt load should in theory, last an hour. The only limitation is the inverter size. Having enough reserve power in case of emergency is also recommended. The electrical energy generated by the PV is converted by the inverter Dc to DC and stored in the connected 12v lithium battery. This means that a 360W solar panel at its maximum efficiency can provide 1800Wh of energy in the span of 5 hours. You have 2 tube lights of 40 watts, 2 fans of 75 watts, and 1 Wi-Fi router of 20 watts working on this battery. If you have four of these batteries charge by solar panels the runtime will be longer. But I have solar panels producing around 27A per hour. Configurable AC/Solar input priority via LCD setting. If bulk charge time is only a few minutes, smart charging systems usually set the absorption time as some moderate multiple of this time. Use the formula below to check if the battery can last for the runtime you need. keep this in mind if you will use a 150ah battery for backup power. How long before the battery runs out? If charging time is not an issue, charging rates much under 0.1C can also be used. Browse other questions tagged, Start here for a quick overview of the site, Detailed answers to any questions you might have, Discuss the workings and policies of this site, Learn more about Stack Overflow the company. Round off the results for easier computations. This is particularly true for lead acid batteries. One, a full discharge is not good for battery health. After say 1.5 hours of charging the amps have dropped to 30amps whilst the SOC on the BMV . A 150Ah battery can serve as a great electrical backup for running basic household appliances and gadgets. C-rate is used to describe how fast a battery charges and discharges. With a 24V battery that would be 3600 watts. A 2000 or 4000 watt inverter would be appropriate in these instances. Those are estimated running times, and there are many reasons why your battery bank may not last that long. By the Way, flooded-cell lead-acid batteries will tolerate a maximum charging current of up to 0.7C. Do not load the inverter at full capacity. Take it like this: the same charger amps produce different charging rates for different size batteries. Although this control loop is useful in many applications, it is unnecessary if the power source can provide the maximum required system current plus the maximum required charger current. There are good reasons why you may not want to run the battery inverter at full capacity. (3) the amount light hitting the panel. It will take 10 hours to charge a 150 Ah battery if it gets 15 Amp. Load regulation: 0.5%. But again, lead acid batteries are not supposed to be fully discharged. Is it appropriate to ignore emails from a student asking obvious questions? How powerful a charger you will need for your AGM battery, Which charger setting to use to get a 0.1C or some other charging rate. If you are not familiar with AGM battery charging stages, you may want to check the first part of this series before reading on. If you have an 85% efficient inverter, that 450 hourly watt load becomes 517 watts. This is the current I used for either charging or discharging your battery. These are the two factors that affect battery capacity and runtime. Because amperes are key to AGM charging practice, it is important that you can translate the C-rates into amperes and back. We say almost because due to inefficiency, inverters will use more power (more on that in a bit). Stack Exchange network consists of 181 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. You can compare this with solar panels, whereby you add more panels to improve performance. . $6.05. How do rates and currents relate? Luckily, most chargers do all this automatically. Calculate how much battery power you need. Whether you are tied to the grid or off, having backup power is essential to run basic appliances. So if you have a 12V Eco Worthy LiFePO4 150ah battery, the watt capacity is 1800. Physics Stack Exchange is a question and answer site for active researchers, academics and students of physics. Advertisementsif(typeof ez_ad_units!='undefined'){ez_ad_units.push([[250,250],'workshoppist_com-box-4','ezslot_1',134,'0','0'])};__ez_fad_position('div-gpt-ad-workshoppist_com-box-4-0'); Battery charging rate means how fast a battery is charged in proportion to its total capacity. I can get into more technical details if you elaborate your question. If you have four of these batteries charge by solar panels the runtime will be longer. There will be times when you might have to use a lead acid battery beyond its 50% DOD rate. Buying a 150ah battery is easy enough, but you have to make sure that it is the right one for your inverter. The 150Ah battery is able to accept a maximum inverter capacity of 3500W only. For example, if your voltage limit is 2.40 volt, you will need to set the voltage to 14.40 volt. You can buy a lead-acid battery from here if you dont have one already. 85% to 95% is acceptable.Buy the highest efficiency rated inverter you can afford.Do not load the inverter at maximum capacity. I'm charging the battery with my vehicle's inverter. Typically this is 5 amps per 20 hours. Overall loads when paralleled should not exceed the current limits of a single batteries BMS. So a 25W PV panel would need 72 hours at full output (1800Wh/25W). The only limitation is the inverter size. Before it drops to 0%, the battery will stop running. Will a 150ah be enough? Received a 'behavior reminder' from manager. This expression means a charge rate that adds 10% of battery full capacity each hour; put another way, this rate would charge a battery from empty (0%) to full (100%) in 10 hours. You want to run a TV, Blu-ray, a fan and lights for a 3 hours. I'll delete my comments to save clutter and david and martin can do the same, @user2146 - no need it's a useful discussion to decide the level of questions here. If you have a lead acid 150ah battery, you should only use 50% of the capacity. When using a smart charger (recommended), you should charge AGM batteries until the charger indicates that the battery is full. Recommended Charging Current: 50A-75A: Recommended Charging Current 50A-75A: Maximum Disharging Current: 100 A: Maximum Disharging Current 100 A: Discharging Cut-off Voltage: 40.5 V: Discharging Cut-off Voltage: 43.2 V: Working Voltage Range: 40.5-54.7 V: Working Voltage Range: 43.2-58.4 V: Operating Conditions Cycle Life Fast charging a larger 100Ah AGM battery at 0.3C takes a current of 0.3C x 100Ah = 30A. This is the max rate recommended by most AGM battery manufacturers. A 24V 150ah battery is going to last two hours with the same load. . The MAX1737 switch-mode lithium-ion (Li+) battery charger includes a source-current loop that regulates the total current drawn from the power source. Maximumdischarge current: 100A Maximumchargecurrent: 50A Surge current: 200A Number of cycles: 2500-7000 Weight: 22.6 lbs. Spread over two hours the inverter consumes about 1034 watts, more than the 75ah can handle. How to Calculate How Long an Inverter Will Last, differences between a 12V and 24V battery, four of these batteries charge by solar panels. When using a charger without an automatic float stage (not recommended), be sure to disconnect charger once the charging voltage has exceeded 14.5V for 4 hours or risen above 15V. First, make sure that the GX sees both pylontech batteries, and not just one. Exceeding the 0.5C charge rate can prematurely wear down the life . )0.2C(fast)0.3C(fast)25%5h5h4h4h50%11h8h7h6h75%17h12h9h8h90%22h15h12h10hif(typeof ez_ad_units!='undefined'){ez_ad_units.push([[300,250],'workshoppist_com-leader-1','ezslot_10',560,'0','0'])};__ez_fad_position('div-gpt-ad-workshoppist_com-leader-1-0'); Although the real charging time will depend on the programming of your charger, this table should give you an idea of how long should you expect your AGM to charge at each bulk rate and DoD. Perform regular battery maintenance. But basically you are looking at 10days of full sunshine. We want our questions to be useful to the broader community, and to future users. Hebrews 1:3 What is the Relationship Between Jesus and The Word of His Power? You can use a smaller inverter size if you do not intend to run the battery at full capacity. If an inverter has a 90% rating, it means 10% energy is lost during the conversion. Battery voltage x amp hours / hourly watt load = battery backup runtime. Charging time obviously depends not only on the charging rate, but also how full the battery is when you start. Lets have a look at the details regarding calculations and the technicalities behind choosing these panels for regular use. Plug specifications: US, UK, EU. All of this will be explained in more detail below. The fastest charging rate recommended by most AGM battery manufacturers is 0.3C; for the charge current this corresponds to, see above. Your inverter and solar power setup are also going to determine how much power is needed. I want to charge a 12V battery of 150Ah with a solar panel. Depth of Discharge (DoD) expresses how much of battery capacity has been drained in use before charging. In this article, we will discuss these calculations in detail below. In a nutshell, charging rate in C-units means how much of the batterys max capacity is restored each hour, charging current in amps is what produces the charging rate, and charging time means how long it takes to reach a full 100% charge. Did neanderthals need vitamin C from the diet? Your appliances may use more power depending on what settings you have chosen. This inverter battery can run TVs, light bulbs, kitchen appliances, computers and other devices and appliances. Make allowances for inverter efficiency issues and drops in voltage. But due to some losses, we may take 12-14 Amperes for batteries charging purpose instead of 12 Amps. Save my name, email, and website in this browser for the next time I comment. The calculation steps are correct, but the runtimes are estimates. But we also need to talk about inverters. For example, a 1C battery needs one hour at 100 A to load 100 Ah. The most important is that lead acid batteries have a depth discharge rate of 50%. So you can load up to 3600 watts of appliances and the battery will last for 4.5 hours, same as a 12V. First, we need a few definitions. Obviously the higher the inverter efficiency rating, the better for your system. You can then estimate the panel's temperature from the ambient temperature - it will (to the first order) be a fairly steady amount above ambient. Due to the downsides, charging rates above 0.1C should be reserved for occasional use in time-critical recharges.AGM MAXCHARGE RATEBrandMax.rate[C]Max.rate[A], 60AhFullriverMastervoltMighty MaxUPGVictron0.35C0.30C0.30C0.30C(<0.2C)21A18A18A18A(12A). Charging these with solar energy will give you free and green energy. . If you are going to run any AC appliances on the battery, you need an inverter. Pure sine wave inverters are the most effective, though some appliances also work with modified sine wave inverters. The house bank voltage shown on the boats normal display shows say 13.3V. Although this will not allow you to hit 0.1C or some other target rate exactly, the options are usually enough to give you at least one safe charging rate under 0.2C. Now you know that you need a minimum of 360 watts for your solar panel. 12V, 25 Watt. If you need to run a lot of appliances, a 1000 watt inverter may be insufficient. Advertisementsif(typeof ez_ad_units!='undefined'){ez_ad_units.push([[300,250],'workshoppist_com-leader-2','ezslot_11',151,'0','0'])};__ez_fad_position('div-gpt-ad-workshoppist_com-leader-2-0');if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[300,250],'workshoppist_com-leader-2','ezslot_12',151,'0','1'])};__ez_fad_position('div-gpt-ad-workshoppist_com-leader-2-0_1');.leader-2-multi-151{border:none!important;display:block!important;float:none!important;line-height:0;margin-bottom:7px!important;margin-left:0!important;margin-right:0!important;margin-top:7px!important;max-width:100%!important;min-height:250px;padding:0;text-align:center!important}Low/High: Many consumer chargers indicate the optional currents with a motorcycle and a car symbol. Can a 24V Solar Panel Charge a 12V Battery? In all three cases the maximum charge current is 30 A, so you can never charge faster than 30 A. But in reality the battery will run out of amps before that. Watts (electrical power) = Volts $\cdot$ Amps, so 25W = 12V $\cdot$ 2.1A. A 24V battery can hold twice as many watts as a 12V. Hi @rossmuller1. Typical charging rate, current and time for a standard 60Ah automotive AGM battery are 0.1C, 6A and 15h. For example, bulk charging an AGM battery at 50% depth of discharge at the standard 0.1C rate takes (50/100 0.2) / 0.1 = 3 hours. July 2, 2022 . Battery sizes are measured in amp hours, so you need to find out how many watts a 150ah battery is. consider it 'case law' ;-), +1 for remembering that most solar panels do not work at night. You also have to make sure that the charge controller can handle the extra power. 12v lithium battery only maintains electrical connection with the inverter. Solar panels produce direct current and this must be turned into alternating current before it is passed onto appliances for use. To charge a 150Ah battery, youll need 1800 Watts during peak sunshine hours. Scope of application: 12V-4Ah-150Ah lead-acid battery (disabled for lithium batteries). Inverter capacity is measured in watts. Chargers have different profiles programmed in, and some charging cycles may take a lot longer than others. You can connect two 12V batteries in a series to get 24V. That's an unusual combination of quite a small panel and a very big battery - is the battery designed to be a multi-week store for a low-power system, by any chance? State of Charge (SoC) expresses how much of battery capacity is left; it is the counterpart of Depth of Discharge. So power of needed solar panel is computed as follows, $12\,\text V\cdot15\,\text A=180\,\text W$. If we assume 50% efficiency, this would bring the time up to 36 hours. if you want to run a full 150ah inverter load, get a lithium battery. Read on to learn about how much solar energy is required to charge a 150Ah battery so it can be utilized as a backup to run your appliances. (C10) Internal resistance: 4m Maximum charging current . Commenting really doesn't help. Output current: DC = 6A (maximum). 12V 150Ah sealed lead acid SLA battery supply by UNICELL in Singapore . The more load you place on an inverter, the more important the efficiency is. Products search. Charging it each day with solar energy will give you free-of-cost green energy. However, this case makes at least two major assumptions, the battery is fully discharged and there are no losses of any kind! 1800 watts is usable if the battery has a 50% depth discharge rate. . To charge a 150Ah battery of 12 volts, you'll need 1800 Wh of energy and a minimum of 360 watts from solar panels to charge the battery. Is there a way to step up the . then maximum charging current is 8A. We take a look at these next, and then sum them up to total charging times. Or you can buy a deep cycle lithium battery that has a 100% discharge rate. In the last part, we went through AGM battery charging voltages. A common 100Ah-150Ah lithium battery can deliver enough energy to operate a maximum of 1000w. But due to Peukerts Law , a battery discharges faster when more amps are drawn. During this stage, the charger adjusts its applied voltage to deliver the maximum current to the battery. For more details, click here. How Long Will a 200W Solar Panel Take to Charge a Battery? So you can load up to 3600 watts of appliances and the battery will last for 4.5 hours, same as a 12V. More info. Hence if there is a 10A load: The solar panel specs is So instead of two hours the battery will cease to work in less than that, maybe an hour and 45 minutes. Mathematica cannot find square roots of some matrices? Use the batteries only as directed. It is difficult to give an exact number for two reasons: batteries lose charge with heavy use, and the depth discharge varies. (Recommended) Charge Current - The ideal current at which the battery is initially charged (to roughly 70 percent SOC) under constant charging scheme before transitioning into constant voltage charging. Yes, you can use a 12v power supply to charge your 12v battery how many amps do i need to charge a car battery? Share . In this guide we will explain what capacity you will need. 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