Is the hotel's solar energy still valuable after several years of use?

It's worthless The actual service life of the solar water heater is fifteen years, and the hotel's solar energy is worthless after several years. The depreciation period of solar water heaters should be comprehensively converted according to the actual purchase price and the maintenance expenses incurred in actual use. After five or six years of use, there is no maintenance cost. The higher the maintenance cost, the more useless it is, and it is scrapped.