As the efficiency of solar cells or solar energy is mentioned, always keep in mind that this has something to do with size. The vast majority of all solar cells to an effective evaluation. To understand this immediately, just compare vs 200Wp high efficiency low efficiency aluminum composite panel. Both produce the same amount of electric potential that is 200Wp. The only difference is the high efficiency panel is smaller than the low efficiency panel. If you have enough space roof or ground, it does not matter whether you use the high or low effective sheet as long as you reach the output capacity of your request.