由于太阳能电池受到光强以及环境等外界因素的影响，其输出功率是变化的，光强发出的电就多，带MPPT最大功率跟踪的逆变器就是为了充分的利用太阳能电池，使之运行在最大功率点。也就是说在太阳辐射不变的情况下，有MPPT后的输出功率会比有MPPT前的要高，这就是MPPT的作用所在。(Because solar cells are affected by external factors such as light intensity and environment, their output power is varied. Light intensity emits much electricity. The inverter with MPPT maximum power tracking is designed to make full use of solar cells to operate at the maximum power point. That is to say that in the case of constant solar radiation, the output power after MPPT will be higher than that before MPPT, which is the role of MPPT.)