Unfortunately, if we look around we can count the photovoltaic panels we see. Concern for the installation and use of photovoltaic panels has grown. In Romania, the popularity of photovoltaic panels has increased due to the fact that, in recent years, several incentive campaigns have been carried out in these investments for an independence from the electricity suppliers. The vast majority of photovoltaic systems are made up of several photovoltaic panels that can be monocrystalline or polycrystalline (monocrystalline ones are made of silicon with a high degree of purity, and offer about 15% better performance than polycrystalline ones). They also contain an inverter that converts solar energy captured from direct current into alternating current, which can be used to power devices in a home. It is recommended that you start studying electricity bills before investing in a photovoltaic system. Then, it is good to talk to a specialist in photovoltaic systems who can calculate the need for photovoltaic panels to support that consumption. If you divide the value of the system by the cost of the bill for a month, you will find out exactly how many months you will pay back your investment and when it will become profitable. Look for a photovoltaic panel manufacturer that has a guarantee of superior performance to ensure that you enjoy stable long-term yields.