This 4kW system consists of 12 x AEG Twin-Peak PERC Monocrystalline panels of 340W, and a Fronius Primo 4kVa, 3-phase inverter.
Such a system produces about 6900kWh per year, yielding annual savings of €1400.
Using laser cut, to divide the standard cells of the panel in half, the Twin-Peak technology offers double the cells, thus reducing the overall resistance and increasing efficiency. The second feature of the panel is PERC technology, which is a reflective layer on the back of the panels that collects and reflects any radiation that penetrated the panel completely, also increasing the overall efficiency. These two features result into increased output over the same surface area of a conventional panel, finding applications where spacing is an issue.
The Net-Metering billing method is a mechanism that debits the amount of energy produced by the solar system and not used directly onto the household, for future use. For 1-phase households, the maximum size allowed to be installed is 4.16 kW, whereas for 3-phase households this limit is 10 kW.
What is included in the quote that you receive?