![]() This is because more energy turns into heat instead of powering devices when discharged quickly. If you discharge a battery too quickly, it won't provide as much energy as the label claims, known as Peukert's law. Batteries discharge unevenly Advertisements Why none of these methods guarantee 100% accuracy? Advertisementsīattery runtime formulas aren't fully accurate due to the complexity of battery discharge, as there are other factors that can impact discharge time. Now let's have a look at why these methods only give estimates, not 100% accuracy. Turns out, in actuality a 50ah battery will run a 10A load for about 1.9 hours. Now let's put this info into our 2nd formula. Running load through an inverter? Yes (inverter efficiency - 90%).Let's continue with the previous example and find out the most accurate runtime estimate. Lithium-ion batteries discharge efficiency ≈ 90 − 95%.Lead-acid batteries discharge efficiency ≈ 80 − 85%.This formula takes into account for battery's discharge efficiency rate, recommended depth of discharge, and state of charge. formula 2 Advertisements Formula: Battery runtime = (Battery Ah × Battery volts × discharge efficiency × DoD limit × SoC × inverter efficiency) ÷ load 50ah ÷ 10a = 5 hrsĪccording to this formula, a 50ah battery will run a 10-amp load for 5 hours. To calculate 50ah battery lifetime using this formula, divide 50ah by 10a. You can convert the battery capacity in watt-hours or the appliance input capacity into watt-hours to make it work.īattery capacity in watt-hours = Battery Ah × Battery voltageĪdvertisements Output load in load in amps = Load in watts ÷ volts Example Which makes it confusing in the first place. Mostly, the battery capacities are mentioned in amp-hours (Ah) but our appliances in watts. Or, Battery runtime = Battery capacity in watt-hours (Wh) ÷ Total Output in wattsĭividing the battery capacity (in amp-hours - Ah, or milliamp-hours - mAh) by the output load (in amps - A, or milliamps - mAh) is the least accurate way to calculate the battery runtime.īecause it doesn't take into account for battery's discharge efficiency rate, recommended depth of discharge, and state of charge. Formula 1 Formula: Battery capacity in Ah ÷ Output amps (A) Ready for calculation? Let's dive in! I'll share 2 methods to estimate battery life from basic (least accurate) to advanced (most accurate). 2 ways to calculate battery runtime Advertisements Enter total output load in watts: If your appliance has an output load mentioned in amps, convert it into watts by multiplying the amps by the given volts of appliance.Įnter " Calculate Battery Runtime" button to get the result. Or select no, if the appliance is directly connected to the battery without an inverter (which is usually not recommended).Īdvertisements 6. Is your load connected through an inverter? Select yes, if you're using an inverter to run the AC appliances. Ask your manufacturer or have a look on at your battery's specs sheet for a more accurate value.Ħ. Lead-acid, AGM, sealed, flooded, and Gel batteries should not be discharged below 50%, while only lithium (LiFePO4, LiPo, and Li-ion) batteries can be safely depleted to 100%. Enter your battery's recommended depth of discharge (DoD) limit: Battery depth of discharge (DoD) measures the used capacity of your battery from its total capacity. A fully charged battery will have 100% SoC.ĥ. Enter your battery's state of charge (SoC): SoC of a battery refers to the amount of charge it has relative to its total capacity. Select your battery type: For lead acid, sealed, flooded, AGM, and Gel batteries select "Lead-acid" and for LiFePO4, LiPo, and Li-ion battery types select "Lithium".Ĥ. Enter your battery voltage (V): Do you have a 12v, 24, or 48v battery? For a 12v battery, ENTER 12.ģ. Enter battery capacity in amp-hours (Ah): If the battery capacity is mentioned in watt-hours (Wh), Divide the watt-hours by battery voltage (V) to find out the battery capacity in Ah.Ģ. How to use our battery runtime calculator?ġ. But it can give you a close estimated runtime. Please note that the calculator doesn't include Peukert's law, temperature, and battery agein its calculations, which can affect the battery's discharge time. ![]() This calculator will take into account the efficiency of an inverter (90%) and the efficiency of the battery discharge (lead acid: 85%, Lithium: 95%).Note: Use our solar panel size calculator to find out what size solar panel you need to recharge your battery in desired hours. ![]()
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