![]() The steady state value was reached in 267 milliseconds. AC POWER calculator for single phase or 3-phase system (balanced load) Active and apparent electrical power : Energy calculation : Formula to calculate power. The inrush current was 7.26 times the steady state run current of 12.4 amperes. The momentary interruption test and the cold load pickup test showed an average inrush current of 90 amperes which lasted for 117 milliseconds. The test after a 25 cycle interruption produced lower inrush current and shorter times to reach steady state, 6 – 17 amperes and with 217 milliseconds to reach steady state.Īlso tested was a 3 ton air conditioner. It took 483 milliseconds to reach the steady state condition. The average inrush was 7.5 times the steady state run current of 2 amperes. The test results showed an average inrush current of 15 amperes and a maximum of 18 amperes. Similar tests were conducted with on a ¼ HP refrigerator motor. This calculation will not work for a whole house or commercial location, but is ideal for determining your mini split, through-the-wall, PTAC or window AC size. A surge factor of 3x should be used for kitchen appliances and other electronics equipment, and surge factor of 1x for resistive loads.Īnother more interesting document on Cold Load Pickup Issues also shows similar inrush current figures. Our BTU calculator is designed to determine how many BTUs are needed for a single room. ![]() Video of the Day Step 2 Find the full load amps (FLA) of the units largest motor. The name plate is a small piece of metal printed with the electrical information for the product. Examine the air conditioner, heater or other electronic unit and find the name plate. I found this mentioned in an Off grid guide by Ja圜ar.Īustralian Standard AS4509.2 states a surge factor of 7x the continuous power should be used for electric motors, water pumps, fridges, air conditioner, and washing machines. Step 1 Locate the name plate of the product to be wired. Why would you like a thinner cable, if it is to save cost then the length is likely subtantial and therefore more of a reason to use thicker conductors.Īlso the electricians are aware that compressor devices have very large inrush currents that are supported by thicker cables. You do not indicate so I wonder if you have considered the cable run length. ![]()
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