What about maintenance of the physical structure? PV panels have no moving parts but:

1. The inverter and other electrical systems do fail (surprisingly frequently).

2. Solar is very spread-out: maintaining a geographically large facility is not trivial (vegetation, water drainage, cables etc.)

3. Batteries also require maintenance, and are an inherent part of any independent PV installation (if the site relies on the grid, it is no longer independent).