太阳能突然不火了，这是为啥？

Group 1: Solar Water Heater Issues - Solar water heaters were once popular for being eco-friendly and cost-effective, but their usage has declined due to performance issues in poor weather conditions [2][3] - Users experience dissatisfaction when solar water heaters fail to provide hot water during cloudy or winter days, leading to a negative user experience [2] - Maintenance costs for solar water heaters can be high, often approaching the cost of a new unit, due to frequent repairs needed after prolonged outdoor exposure [3] Group 2: Challenges in Solar Power Industry - The solar power industry in the U.S. has faced significant challenges, particularly after the repeal of key federal incentives under the Trump administration, leading to delays and reduced installation rates [4] - In China, while solar installation capacity has increased, the growth rate has slowed, and prices for key components like polysilicon and solar cells have dropped significantly, causing many companies to incur losses [5] - The solar thermal power sector has not seen significant new projects since 2020, with existing policies lacking continuity, which hampers further development [5] Group 3: Future Prospects - Despite current challenges, there are opportunities for growth in the solar industry, particularly through technological innovation and international cooperation, as evidenced by participation in events like the European International Solar Exhibition [6] - China is positioned as a leading player in the global photovoltaic market, with many companies showcasing innovative products and technologies [6]