The expected usable life of a UPS system is many years, often more than a decade. You wouldn't expect your vehicle fleet or your manufacturing machinery to continually give you the same quality output if you run it for a decade without maintenance, would you?
The same applies to UPSs and DC systems. As years go by, the attached loads will vary. Batteries will need changing. The devices need periodic cleaning to prevent overheating. Connections and cabling need to be inspected. Software upgrades have to be installed. And so on.
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