Just make sure to read the manual regarding the margin of error.Ī lead acid battery voltage chart is a crucial reference that people need to understand and use if they would like to get the maximum value of their batteries. Although not as accurate as a multimeter or a hydrometer, this method is still a good way to get an estimated result for your guidance. Buy a Solar Charge Controller - If you own or are planning to get a solar power system, chances are it will already come with a battery status indicator although you can still buy a solar charge controller if you don’t have one. The only downside to this is that it can only work for flooded/wet lead acid batteries. Get a Hydrometer to Check Specific Gravity - Using a hydrometer is another great way to check lead acid battery capacity because of its accuracy.Use a Multimeter - The best and easiest way to test the charge of a battery is through the use of a multimeter since it can provide the most accurate and most reliable results against other kinds of battery capacity testers.There are a few ways that you can take to check the lead acid battery capacity. This then shows a 2.52 volt difference between 100% and 0% discharge. Meanwhile, a 48V flooded lead acid battery is in a fully charged state at 50.92 volts and it is in a fully discharged state at 48.40 volts (assuming 50% max DOD). This gives us a 3.80 volt difference between 100% and 0% charge. īased on the chart above, a 48V sealed lead acid battery is in its fully charged state at 52.00 volts and that it is in a fully discharged state at 48.20 volts (assuming 50% max DOD). It is also used for high-power capacity solar-powered generators such as Nature’s Generator Powerhouse. Typically used by telecom companies for their backup power supply is a 48V lead acid battery. This means that only about 50% of the full capacity of a lead acid battery can be extracted and utilized. Second, lead batteries have a depth of discharge (DOD) of approximately 50%. Again, as a reminder, it is always better to use the chart that came straight out of the box of your lead battery but if you’re just looking for a general guide, you may take a look at the chart we have below.Īlso, two important things you need to take note of before you proceed: One, when estimating the state of charge, it should be done at room temperature and the battery is at rest for at least half an hour. Lead acid batteries are most commonly used in a wide array of applications including renewable energy systems such as solar power systems, backup power supplies such as uninterruptible power supply (UPS), and of course, in automobiles (for starting and ignition power).īelow are 3 lead battery voltage charts for the most common lead acid battery voltages - 12V, 24V and 48V. Sealed lead ones SLA/VRLA batteries on the other hand require less maintenance and ventilation, not to mention it is leak-proof and can withstand changing climates better than the flooded variant. Flood lead acid batteries are cheaper although they require more maintenance and proper ventilation. Speaking of battery type, lead acid batteries come in two types: flooded/wet lead acid batteries and sealed lead acid(SLA)/valve-regulated lead acid (VRLA) batteries. While there are available voltage charts that you can find online or get at your local battery store, it is always best to refer to the lead acid battery voltage chart provided in the manual that comes along with the battery you are using/going to use. Lead acid battery voltage curves vary depending on factors such as battery type, temperature, and discharge rate. Using this chart will let you know the corresponding % charge, basically how much more juice is left, in a lead acid battery based on the voltage it is currently showing The good news is that there are lead acid battery voltage charts you can refer to if you want to find the specific battery voltage (6V, 12V, 24V, 48V, etc.) state of charge (SOC). For example, a 12V sealed lead acid battery has a 12.89V at 100% charge, and then once it goes down to 11.63V that means it is at 0% charge. Just like any other type of battery, lead acid batteries have a different voltage at different stages of charge.
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