An inverter uses around 1 amp per hour with no load. This adds up to 24 amps daily and 168 amps weekly. To save battery power, turn off the inverter when you don't need it. Keeping track of inverter usage helps improve energy efficiency. For example, a. . To calculate the amp draw for inverters at different voltages, you can use this formula Maximum Amp Draw (in Amps) = ( Watts ÷ Inverter's Efficiency (%)) ÷ Lowest Battery Voltage (in Volts) Let us see an example of an inverter amp calculator for a 1500-watt inverter The maximum current drawn by a. . The first step to sizing a battery pack when using a DC to AC power inverter is to know your DC amp rating. Our calculator will help you determine the DC amperage as it passes through a power inverter and provides the wattage rating you are pulling so you can properly size the power inverter you. . An inverter is a device that converts direct current (DC) to alternating current (AC) and is widely used in areas such as solar power, electric vehicles and portable power. When choosing an inverter, it is critical to understand its current consumption as this will directly impact battery storage. . I have listed down the estimated amperage draw values for a range of common inverter wattages. A 300 Watt Inverter generally pulls about 29. A 600 Watt Inverter commonly draws. . The current draw from a 12V or 24V battery when running an inverter depends on the actual load, not the inverter size. A quick rule is to divide watts by 10 for 12V systems or 20 for 24V systems. For more accuracy, divide the load by the actual battery voltage and adjust for inverter efficiency. .