Huangming Solar's hl and ll represent high water level and low water level respectively. Solar meters can set high and low water levels. Huangming Solar Energy Co., Ltd. (hereinafter referred to as Huangming Solar Energy Co., Ltd.), as a leader in the world's solar energy industry, has an annual collector area of ??3 million square meters, which is equivalent to the entire European Union combined and more than twice that of North America. Its brand collection China's well-known trademarks and China's environmental label products are integrated into one. The business mainly includes: solar water heaters (household hot water solutions), solar hot water systems (unit collective hot water solutions), solar high-temperature thermal power generation, solar air conditioning, seawater desalination, etc.