5. Dimensioning of DC Power Systems AC input requirements Each Rectifier Module has an input current of: I max = (P max /Eff) / V input where: I max : Maximum Input Current P max : Maximum Output Power Eff : Efficiency of the Rectifier Module V input : Input Voltage of the Rectifier Module NOTE! Max input current of Eltek’s SMPS 1000SI 48V is 5.5A/200V ac