19/07/2023
In the photovoltaic off-grid system, the main function of the inverter is to invert the DC power of the battery into AC power. Off-grid systems are widely used, and inverters come in various forms. Output wave can be classified into two forms, one is pure sine wave and the other is modified sine wave.
The modified sine wave inverter uses PWM pulse width modulation to generate modified wave output. Due to the existence of about 20% harmonic distortion, it cannot be used with inductive loads such as air conditioners, but it can be used with resistive loads such as lamps. The modified sine wave inverter adopts a non-isolated coupling circuit with simple components and high efficiency. The pure sine wave inverter adopts the isolation coupling circuit design, the circuit is more complicated and the cost is higher, and it can be connected to any common electrical equipment (including TVs, LCD monitors, etc., especially inductive loads such as refrigerators) without interference.
When choosing an off-grid inverter, we need to pay attention to the output waveform of the inverter, and several technical parameters are also very important, such as system voltage, output power, peak power, conversion efficiency, switching time, etc. The selection of these parameters has a great influence on the power demand of the loads.
https://youtu.be/98end5KEKPE
In this video, types of electrical loads are explained in easiest way. Resistive load, inductive load and capacitive load is explained. Also, one of the misc...