Ключевые слова: alternative, building, cell, collector, copy space, current, daylight, daytime, electrical, electricity, energy, environment, environmental, facing, friendly, generating, generation, house, installation, modules, outdoors, panels, photovoltaic cells, photovoltaic panels, photovoltaic roof, photovoltaic system, producing, production, pv panel, pv panels, regenerative, renewable, renewable energy, renewable source, roof, sky, slate, snow, snow covered, solar electric, solar energy panels, solar panel, solar power, sunlight, supply, tiles, voltage, winter, wintertime, wintery, wintry,