The paper analyzes the electricity generation from photovoltaic micro-installation, which was not subjected to any maintenance operations such as cleaning or periodic change of the PV panel tilt angle, recorded in the years: 2015-2017. The PV micro-installation presented is a system called On-Grid, i.e. it is connected to a low voltage power network, and the PV generator is built from the two most commonly used types of PV modules: from mono- and polycrystalline silicon. Data sets for relative energy yields combined and broken down into PV generator manufacturing technologies were analyzed. The results of the measurements were also divided into percentage amounts of generated energy in two time intervals: "summer" months from April to September (on average over 80% of generated electricity) and others recognized as "winter". This division was also made for two technologies of making a PV generator.
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