Wiring batteries in series sums their voltages but keeps their amp hours the same.įor example, let’s say you wire two 12V 100Ah LiFePO4 batteries in series. Batteries can be wired in series, parallel, or series-parallel. In certain cases – such as building an off-grid solar power system – you may need to wire multiple batteries together to build a battery bank. Your car battery has a capacity of 600 watt hours. To calculate its watt hours, you multiple its amp hours by its voltage: 50Ah × 12V = 600Wh Let’s say you have a 12V 50Ah car battery. If your battery’s capacity is given in milliamp hours, multiply its milliamp hours by its voltage and then divide by 1,000.įormula: battery watt hours = battery milliamp hours × battery voltage ÷ 1,000Ībbreviated formula: Wh = mAh × V ÷ 1,000Ĭalculator: Milliamp Hours to Watt Hours Calculator Example: 1 Battery To calculate a battery’s watt hours, multiply its amp hours by its voltage.įormula: battery watt hours = battery amp hours × battery voltageĬalculator: Amp Hours to Watt Hours Calculator In this example, your battery has a capacity of 100 amp hours. Here’s how to calculate its amp hours: 1280Wh ÷ 12.8V = 100Ah You look at the battery specs and see that it has a voltage of 12.8 volts and a capacity of 1280 watt hours. Let’s say you have the following LiFePO4 battery. To calculate a battery’s milliamp hours, divide its watt hours by its voltage and then multiply by 1,000.įormula: battery milliamp hours = battery watt hours ÷ battery voltage × 1,000Ĭalculator: Watt Hours to Milliamp Hours Calculator Example Small batteries - such as those found in phones, tablets, and battery packs - more commonly express their battery capacity in milliamp hours. To calculate a battery’s amp hours, divide its watt hours by its voltage.įormula: battery amp hours = battery watt hours ÷ battery voltageĬalculator: Watt Hours to Amp Hours Calculator For battery banks with multiple batteries wired together, we’ll also calculate your battery bank’s voltage. And if you’ve entered your battery capacity in amp hours, we’ll calculate your battery’s watt hours. If you’ve entered your battery capacity in watt hours, we’ll calculate your battery’s amp hours. Click “Calculate Battery Capacity” to get your results. We’ll use this number to calculate the length of your parallel strings.ħ. For instance, if each of your series strings has 4 batteries in it, you’d enter the number 4. If your batteries are wired in a series-parallel configuration, enter the number of batteries wired together in each series string. If you’ve selected the series-parallel option, a field will appear asking for the length of your series strings.Ħ. The series-parallel option is only available if you’ve entered a number of 4 or greater in the Quantity field. The wiring options are series, parallel, and series-parallel. If you have multiple batteries in your battery bank, select how they’re wired together. If you enter 2 or more, a field will appear asking how your batteries are wired together.ĥ. If you’re calculating the capacity of 1 battery, you’d just enter the number 1. Enter the number of batteries you have in your battery bank. For some battery types, such as lead acid batteries, you can’t use their full capacity without damaging them and shortening their lifespan.Ĥ. If you select a battery type, we’ll estimate your battery’s usable capacity. Optional: Select your battery type from the list. If you have a 12V battery, you’d enter the number 12.ģ. For instance, if you have a 1200Wh battery, you’d enter the number 1200 and then select “Wh” from the list of unit options.Ģ. The unit options are milliamp hours (mAh), amp hours (Ah), watt hours (Wh), and kilowatt hours (kWh). Enter your battery’s capacity and select its unit from the list. Battery voltage: How to Use This Calculatorġ.
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