This means you need an inverter with at least 2. 5 kW capacity to handle this load comfortably, factoring in efficiency losses and a safety margin. Use our online tool Watt to Amp Calculator (Single & Three-Phase): Best ToolCalculate the right inverter size for your power needs Combined wattage of all devices you want to run Motors and compressors can surge 2-3x on startup Motor loads require higher surge capacity Choosing the right inverter size is critical for any off-grid, RV, or backup power system. By. Your inverter needs to handle every watt your loads demand simultaneously -- both the steady continuous draw and the brief high-power surges when motors start. Oversizing wastes money and efficiency. Continuous Power (or nominal rating) is the amount of power the. When selecting an inverter, consider both continuous power needs and startup (surge) requirements: Many appliances with motors (refrigerators, air conditioners, pumps) require 2-5 times their rated wattage to start up.
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