— the presence of a Surge sockets in the UPS design. Such sockets are not much different from standard 230 V household ones — they are not connected to the UPS battery, and when the mains power fails, the voltage in these sockets also disappears (although the UPS can play the role of an interference filter). In Surge sockets, devices for which a constant power supply is not critical can be plugged— for example, a printer or scanner. This will save battery power and extend UPS runtime.
