Caveat: This reply focuses on the pc components, not other devices that might even be powered via the UPS. I have observed occasional experiences of non-sine wave power getting incompatible with selected other devices. all classes and interfaces within the superclass hierarchy (e.g. see Java course is current in classpath https://condonearme82692.blazingblog.com/33815999/uninterruptible-power-supply-ups-fundamentals-explained