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The image displays an indoor laboratory or classroom setup in Sliven, Bulgaria, centered around a solar energy demonstration unit. The primary subject is a large, light-beige panel, approximately 1.5 meters wide, affixed to a white, adjustable metal stand. This panel holds two rectangular photovoltaic solar modules, each featuring an array of dark, square solar cells. Mounted centrally on the beige panel, between the solar modules, are three electronic components: a small, light-colored rectangular display unit at the top, followed by a black rectangular device, and then a smaller blue rectangular device labeled "DCDC." The entire panel assembly is labeled "HELIOTRON 2022" near its top edge. In the left foreground, a wooden desk supports multiple electronic devices. A grey, rectangular instrument with various ports and a white coiled cable extending from it is positioned on the desk. Behind this, a turquoise-colored device with a circular dial is partially visible. A larger, grey, box-like unit is partially visible in the extreme left foreground. Below the main solar panel stand, on a black base, a grey lead-acid battery, partially labeled "VARTA," is present and connected by wires. The floor is light-colored and textured. The background on the right features a large window with white frames, looking out onto an exterior light-colored building or courtyard. A white corrugated radiator is installed beneath the window. To the left of the window, a brown-orange wall is visible, and further back, dark shelving units contain indistinct objects. Another larger, darker solar panel is leaning against a surface in the distant background.
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