9/12/2023 0 Comments Air conditioner current calculator![]() If our AC input voltage is single phase, then we have our answer, 5.57 amps. If we take the 577 VA and divide it by 103.5Vac we get: We need to subtract 10% to account for the worst case, low line condition: This is the nominal voltage, in reality the input voltage is specified at ☑0%. In the example above the AC input voltage is 115Vac. We need to know the AC input voltage the unit is designed to be powered from. In our example above the supply is an uncorrected unit, powered by a single phase line so: Units with active power factor correction circuitry can have very good power factor like 0.98. Three phase uncorrected switching power supplies have a higher power factor, like 0.85. Single phase uncorrected switching power supplies typically have fairly poor power factor, like 0.65. ![]() Real power is expressed in watts while apparent power is expressed in VA (volt-amperes). It is typically expressed as a decimal number less than 1. Power factor is the ratio of the real power to apparent power utilized. To figure out the input power we take the stated maximum output power and divide by the efficiency: Efficiency is typically stated as a percentage or a decimal less than 1, like 80% or 0.8. The power supplies efficiency is the ratio of input power to output power. Like for this example an S元0P300/115 is a 30kV, positive polarity unit that can provide 300 watts, maximum operated from 115Vac input line. Most of Spellman’s power supplies have the maximum power rating right in the model number. This is the first parameter we’ll need and it can be obtained from the product data sheet. Calculating the maximum input current is fairly easy knowing a few basic parameters and some simple math.Īll of Spellman’s power supplies have an advertised maximum power rating, in watts. Knowing a power supplies maximum input current can be helpful in selecting electrical service requirements, circuit breaker selection, AC input cable and connector selection and even picking an isolation transformer in floating applications. How to Calculate Maximum AC Input Current.
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