Just use this conversion formula: 1 Ton = 3. 5169 kW In practice, we say that 1 ton is equal to 3. How to choose the capacity of an inverter? The capacity of an inverter should be chosen based on the total power requirement of the devices it will be powering. It calculates the total load, required VA, recommended inverter size with safety margin, DC input power, AC output power, apparent power, and the power factor. Although you can use our tool whenever you want, knowing the formula can come in handy in situations where you would want to show off your math skills, in a class pop quiz, or in case of. A ton of refrigeration is approximately equal to 12,000 BTU/h or 3.