There is no phase difference between the load current and the load voltage of resistive load. The internal load is resistive, such as incandescent lamps, electric furnaces, etc. The load that only produces effects through electrical components is a resistive load. This type of load has low requirements for voltage and waveform, similar to incandescent lamps, when the voltage is low, the brightness will follow to dim, but it will not affect the incandescent lamp.
Capacitive load refers to the existence of a capacitor in the load. Because of the characteristics of the capacitor, it needs a very large current instantaneously. Due to the phase difference, the current of the load exceeds the voltage of the load, thereby reducing the power factor of the circuit. We call capacitor or other similar components with capacitive parameters inside as capacitive load. The starting power of this type of load is usually 2-4 times the rated power. For example, a fluorescent lamp with a rectifier has a rated power of 8W, but the actual starting power will between 15W-40W, this is a relatively common capacitive load. There is a speical capacitive load, which is the charger of various devices, especially the battery charger. If the quality of the charger is not good enough, it will produce a large haemonics, which will interfere with the inverter. In our actual test, an 2000W pure sine wave inverter with a 1000W battery charger has very large interference, and even cannot start normally. There is also an electric blanket, because the layout of the resistence wire for heating is looped, it will also cause very big interference. A normal 100W electric blanket and a 600W pure sine wave inverter will not work properly.
Inductive load refers to the load with inductive parameters in the load, which are made using the principle electromagnetic induction. Since the current change caused by the phase difference with the power supply lags behind the voltage, a larger current is required at startup. The instantaneous power of a general inductive load is 4-7 times the rated power, such as motors, compressors, electric fans, air conditioners, washing machines, etc. If you use this type of devices, please use the pure sine wave inverter that is 4 times higher than the rated power, because the peak power of the pure sine wave inverter is 2 times the rated power, which has actually reached the inductive load 8 times the peak power at startup. Of course, this kind of load has very high requirements on the waveform, and the modified sine wave inverter is not suitable for this kind of equipment. If used for a long time, the equipments will be damaged and cannot be repaired.
According to the load situation, choosing the right power inverter will save you a lot of unnecessary trouble.