![]() ![]() For example, the rates in amps for most lead acid batteries are 30% of amp hour capacity. Pretty easy! Why Convert Kilowatt Hours to Amp Hours? Battery charge and discharge rates are based on their capacity in amp hours. ![]() So, in this example, your generator's battery has a capacity of 50 amp hours. Knowing these two numbers, you can now calculate your battery capacity in amp hours. You look through the product manual and find that the battery voltage is 43.2 volts. Let's say you own a solar generator with a battery capacity of 2.16 kilowatt hours. To convert kilowatt hours to amp hours, divide kilowatt hours by volts, then multiply by 1,000.Ĭonversion formula: amp hours = kilowatt hours ÷ volts × 1000Ībbreviated: Ah = kWh ÷ V × 1000 Example: How to Calculate Amp Hours of a Battery How to Convert Kilowatt Hours to Amp Hours (kWh to Ah) Note: Don't see the values you're looking for in this chart? Use our kilowatt hours to amp hours conversion calculator at the top of this page to calculate them for your specific scenario. Here is a conversion chart converting common kilowatt hour values to amp hours at 12V and 24V. Table 2 lists each 3-phase constant for the respective 3-phase voltage obtained from the above calculation.Or would you instead like to convert amp hours to kilowatt hours? Kilowatt Hours to Amp Hours Conversion Chart Now, if you look at the “1,000 ÷ 1.732V” portion of this equation, you can see that by inserting the respective 3-phase voltage for “V” and multiplying it by 1.732, you can then divide that resulting quantity into “1,000” to get a specific number (or constant) you can use to multiply “kW” to get the current draw of that 3-phase load at the respective 3-phase voltage. If you have a piece of equipment that draws 80A, then you can calculate the relative size of the required power source, which is 10kW (80 ÷ 8.33).īy using this same procedure but inserting the respective single-phase voltage, you get the following single-phase constants, as shown in Table 1.įor 3-phase systems, we use the following equation:Īgain, assuming unity PF and solving this equation for “I,” you get: So, if you have a 10kW load, you can calculate the current draw to be 83.3A (10 × 8.33). Now, if we look at the “1,000 ÷ V” portion of this equation, you can see that by inserting the respective single-phase voltage for “V” and dividing it into the “1,000,” you get a specific number (or constant) you can use to multiply “kW” to get the current draw of that load at the respective voltage.įor example, the constant for the 120V calculation is 8.33 (1,000 ÷ 120). Single-Phase Calculationsīasic electrical theory tells us that for a single-phase system,įor the sake of simplicity, let's assume the power factor (PF) is unity. You can use constants that apply to specific single- and 3-phase voltages to calculate current (I) and kilowatts (kW). No matter what the circumference and diameter of the respective circle, their ratio is always pi. You may ask, “What exactly is a constant?” An example of a constant with which you're very much familiar is pi (π), which is derived by dividing a circle's circumference by its diameter. We'll also show you how you can do these calculations “in your head,” with very reasonable accuracy, through the use of constants. This month, we'll discuss the most fundamental of calculations - those for current (I) and kilowatts (kW). Welcome to the first in a series of articles focusing on electrical calculation basics.
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