Let’s say you have a 5 kWh solar generator. To convert kilowatt hours to amp hours, multiply kilowatt hours times 1000, then divide by volts.įormula: amp hours = kilowatt hours × 1000 ÷ volts
300 MAMP TO AMP HOW TO
How to Convert Kilowatt Hours to Amp Hours (kWh to Ah) For instance, it's more common to see a battery marketed as having a capacity of 300 watt hours rather than 0.3 kilowatt hours. Note: You'll usually see battery capacities of less than 1 kilowatt hour expressed in watt hours. So, your lithium battery has a capacity of 1.2 kilowatt hours, or 1200 watt hours. Going back to the example above of the 1.2 kWh lithium battery, if you wanted to instead express the battery's capacity in watt hours, you'd do the following: 1.2 kWh × 1000 = 1200 Wh So, to convert kilowatt hours to watt hours, you simply multiply kilowatt hours times 1000.įormula: watt hours = kilowatt hours × 1000 Watt Hours vs Kilowatt Hours (Wh vs kWh)ġ kilowatt hour is equal to 1000 watt hours, like how 1 kilometer is equal to 1000 meters. In reality, battery capacity depends on a host of factors including things like discharge rate, battery age, battery chemistry, and ambient temperature. Note: This is a very simplified scenario. Energy usage is usually listed in watt hours or kilowatt hours, so calculating a battery's kilowatt hours helps you figure out how long the battery can power the device or appliance.įor instance, if you have some LED lights that consume 100 watt hours a day, a 1 kilowatt hour battery can power them for about 10 days before needing to be recharged.
The bottom line is, if you're comparing batteries of different voltages, you need to compare their kilowatt hours rather than their amp hours.Ĭonverting amp hours to kilowatt hours is also helpful when sizing batteries. That's right - the 24V 100Ah battery stores twice as much energy as the 12V 100Ah battery. You learn the 12V 100Ah battery has a capacity of 1.2 kWh: 100 Ah × 12 V ÷ 1000 = 1.2 kWhĪnd the 24V 100Ah battery has a capacity of 2.4 kWh: 100 Ah × 24 V ÷ 1000 = 2.4 kWh So you calculate the kilowatt hours of both of your batteries. To take both of these into account, you need to calculate a battery's kilowatt hours. Like I said, the amount of energy stored in a battery depends on its amp hours and voltage. You may assume, then, that they hold the same amount of energy. If you look at their amp hours, you see they're identical. This is because the total energy a battery can provide depends on both its amp hours and voltage.įor example, let's say you have a 12V 100Ah battery and a 24V 100Ah battery. It's easy to deduce that a 12V 50Ah battery has half the capacity of a 12V 100Ah battery, for instance.īut, once you start to compare batteries of different voltages, only comparing their amp hours can lead to confusion. This is helpful when comparing batteries with the same voltage. It's common for battery sizes to be listed in amp hours. So, in this example, your battery has a capacity of 1.2 kilowatt hours. Knowing these, we can now calculate its kilowatt hours.
It has a capacity of 100 amp hours and a voltage of 12 volts. As you can see, these are printed right on the front of the battery. To calculate battery capacity in kilowatt hours, first locate its amp hours (Ah) and voltage (V). To convert amp hours to kilowatt hours, multiply amp hours times volts, then divide by 1000.įormula: kilowatt hours = amp hours × volts ÷ 1000Ībbreviated: kWh = Ah × V ÷ 1000 Example: How to Calculate Kilowatt Hours of a Batteryįor example, let's say you own this lithium battery: How to Convert Amp Hours to Kilowatt Hours (Ah to kWh) Here is a conversion chart converting common amp hour values to kilowatt hours at 12 and 24 volts. Or would you rather convert kilowatt hours to amp hours? Amp Hours to Kilowatt Hours Conversion Chart
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