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How to choose photovoltaic panels?
When considering the installation of a photovoltaic system, the investor is faced with a number of choices and decisions to make. There are many different PV panels, inverters, mounting systems and installation companies on the market. In practice, all of the above-mentioned aspects boil down to the selection of an expert contractor who will take care of the project comprehensively from conception to implementation and connection of the installation.
It is also not an easy task to choose the right system size, panel layout, mutual selection of equipment and safety features for a photovoltaic installation.
Despite entrusting this in the hands of specialists, it is advisable for the investor to have the basic knowledge to verify the offers made by the contractors. As the photovoltaic panels are the most important part of the installation, it is with them that an overview of the features and parameters that are important to maintain reliable and efficient operation should begin.
How to select an inverter in a photovoltaic installation
The selection of the inverter is mutually dependent on the photovoltaic panel area used – more specifically, the maximum electrical power generated by the panels. The two components, the photovoltaic panel array and the inverter, must be selected in such a way as to ensure the highest possible operating efficiency and to maintain, for as long as possible, the expected maximum output of the photovoltaic installation (e.g., 3 kWp).
High-performance inverters achieve a maximum operating efficiency of more than 98%. The high operating efficiency of the inverter ensures a favourable energy and economic effect – reducing the payback period. The efficiency of the inverter depends on the instantaneous load (the AC current at the inverter output in relation to the nominal current for the inverter).