It is certainly the degree of efficiency. The efficiency, ie, in which the inverter
turns electricity generated by the modules. Typically, the efficiency ranges in the range between 90% and 98%.
Obviously, the higher the efficiency of the inverter, the greater the amount of electricity fed into the grid and transformed. In this regard, an example will demonstrate how a seemingly small difference in the performance of an inverter
may affect the return on investment in a photovoltaic system.
Imagine having to choose between two inverters that have a yield difference approximately 2%. Assume further that the nominal power of our system is approximately 6 kWp (a professional firm or a small office). Imagine, finally, that the plant is located in the South The theoretical annual energy capability should therefore amount to approximately 1,600 kWh / kW. Our system should therefore produce 1,600 kWh / kW x 6.00 kW = 9,600 kWh per year. Now, though, as
we hypothesized that the difference in the performance of the two inverters is equal to 2%, it means that we have a difference of energy equal to 2%.
That is, an inverter will produce a 2% more electricity than the other. This difference will be exactly equal to 2% 9600 kWh. That is, about 192 kWh. The incentive rate is recognized equal to 0.42 € / kWh. Multiplying the amount of the fee for 192 kWh we obtain a value of € 8.00 which is the difference in economic terms, representing the difference in performance between the two inverters to be evaluated. € 8.00. A few, right? You're right.
We try, however, to repeat the same calculation for air a bit 'bigger. For example, an installation of 50 kWp (keeping in mind the price, in this case, it would be of 0.40 € / kWh), the difference corresponding to a difference in economic performance of the inverter
equal to 2% would be 50, € 00 per year, 1000 € in total, for a period of twenty New Energy Bill. For a 100 kWp, the economic difference would be 100 € / year, and € 2,000 in total.
continue?
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