First of all, to answer your question, the lifespan of a battery panel is 20 years. Generally, the shelf life of domestic manufacturers is 5 years, some 8 years, and very few 3 years. Besides, some battery panel manufacturers claim that their own panels can have a lifespan of 25 years, such as Sharp
In addition, after repurchasing it, you need to clean the surface of the panel Occasionally, dust covering the surface of the battery panel will also affect the service life, which is not the manufacturer's responsibility.
One more thing, batteries are required and many supporting facilities also affect the lifespan
Generally it is 12V or 24V lead acid batteries , which can be used in combination according to your needs.
Since the production of solar panels fluctuates, they must be stored in the battery beforebe put into service.
The battery is generally a lead acid battery. In small and micro systems, nickel metal hydride batteries, nickel-cadmium batteries or lithium batteries can also be used.
Typically, an inverter is used to convert direct current to alternating current.
In many occasions, it is necessary to provide 220VAC and 110VAC AC power. Because direct solar power generation is usually 12V DC, 24V DC or 48V DC. In order to power 220V AC electrical appliances, the DC power generated by the solar power generation system needs to be converted into AC power, so a DC-AC inverter is required. In some situations, when multiple voltage loads need to be used, a DC-DC inverter is also used, for example to convert 24 V DC power to 5 V DC power.