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What is the most important characteristic of an inverter?

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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modules for a photovoltaic system must be certified

Because the modules for a photovoltaic system to be certified? It expressly requires the Decree of 19 February 2007. The supplier may also propose the best form of the world, but if it does not have a certificate, is not for our
if we are to obtain the incentives of the New Energy Bill.

The GSE will reject, in fact, our common recognition of the incentive rates, if not installed photovoltaic modules Certificates.

But what I'm talking about certification? The photovoltaic modules of a system connected to the electricity network in Italy are obliged to be certified according to IEC 61215, which determines the electrical and mechanical characteristics.

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The technical specifications of photovoltaic modules

The SPC is the identity card of a photovoltaic module. In it contains the main technical features that define the performance of the module. Often it is a description of the module, its components, cells and the material that constitutes it.
concentrate on the technical characteristics.
usually shows the ratings, that is the power measured in terms standard set by international standards (Standard Test Conditions, STC). But perhaps the most important feature of all is the tolerance on power. What is the meaning of this switch? This indicates the manufacturer's warranty as to the reproducibility over the years, the performance of the module, as indicated in the technical, with a consistency that has
deviations, according to a range more or less wide.
A little 'complicated, right? We express the same idea in different ways. The higher the value of tolerance Power, the lower the reproducibility of the module performance over the years, because the greater the deviation of performance respect to the parameters specified in the technical and, consequently,
lower the quality of the module.