Photovoltaic + heater. Power selection of panels and other components.

The discussion revolves around the feasibility of using photovoltaic (PV) panels for heating domestic hot water, comparing it to traditional solar collectors. Users express concerns about the initial costs and efficiency of PV systems, particularly for a 100-liter boiler. Recommendations include using a minimum of 1.5 kWp of PV panels, with a suitable inverter (e.g., SMA, Fronius) and a heater that matches the panel output. The importance of energy storage and the potential for on-grid systems to utilize excess energy is emphasized. Users also discuss the practicality of DIY solar collectors versus purchasing ready-made solutions, highlighting the need for proper calculations to determine the required power and efficiency. The conversation includes technical details about system components, installation considerations, and the impact of panel orientation and weather conditions on performance.
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