Power Station Power Factor Correction: Reactive Loads and Apparent Power

Volume I  ·  May 2026  ·  258 words

Power factor is the ratio of real power (watts, the power that does useful work) to apparent power (volt-amps, the product of voltage and current). A resistive load like a heater has a power factor of 1.0 — all current does work. A motor load like a refrigerator compressor has a power factor of 0.6-0.8 because the motor's inductive windings draw current that is out of phase with the voltage and does no useful work. A portable power station's inverter rating is in watts (real power), and it must supply the real power component of the load. The apparent power (VA) can exceed the wattage rating without tripping the inverter if the power factor is low — but the inverter must still supply the reactive current, which generates additional heat in the inverter. The EcoFlow Delta 2 and most consumer power stations specify their inverter rating in watts and do not publish a VA rating — the assumption is that the rating accounts for typical power factors of 0.8-1.0. A load with a very low power factor (below 0.6) may trip the inverter at a lower wattage than the rating suggests because the reactive current exceeds the inverter's internal current limit. This is most likely with older or inexpensive motor-driven appliances.