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: So, your lithium battery has a capacity of 1.2 kilowatt hours, or 1200 watt hours. Note: You'll usually see battery capacities of less than 1 kilowatt hour expressed in watt hours.
For example, if you have a 150 Ah battery with a voltage of 24V, the calculation would be (150 Ah * 24V) / 1000 = 3.6 kWh. For easy and accurate conversions at various voltage levels, use our interactive amp hours to kilowatt hours conversion calculator. Enter the values in the boxes, press ‘Convert’, and see the result. 1. Definitions
To calculate battery capacity in kilowatt hours, first locate its amp hours (Ah) and voltage (V). As you can see, these are printed right on the front of the battery. It has a capacity of 100 amp hours and a voltage of 12 volts. Knowing these, we can now calculate its kilowatt hours. Here's how to do it:
The conversion from Ampere-hours to kilowatt-hours involves multiplying the Ah by the battery’s voltage and then multiplying it by the time in hours. For example, a 100Ah battery with a voltage of 12V would have a capacity of 1.2 kWh (100Ah x 12V = 1.2 kWh).
Lithium-ion batteries, prevalent in electric vehicles and portable electronics, have a different approach to kWh calculation. The formula takes into account the nominal voltage and ampere-hours (Ah): markdown kWh = Voltage x Capacity (in Ah) Understanding these variations ensures precise calculations tailored to specific battery types.
For a 12V 200Ah battery, the calculation would be: kWh = 12V x 200Ah / 1000 = 2.4 kWh. This means that the battery has an energy capacity of 2.4 kilowatt hours. It can deliver 2.4 kilowatts of power for one hour, or 1.2 kilowatts for two hours, and so on.