Each machine comes with an internal battery backup unit (UPS).
Genesis units come with a power supply unit (PSU), which is a device in the computer that converts AC to DC voltage to power the motherboard and CPU.
They also come with a UPS, which is a battery backup device that takes in AC voltage and outputs AC voltage. This device is located in the bottom of the ATMs and serves as a backup battery in the case of a power outage or any case in which the ATM suddenly loses power.
Also, it is important to note that when using the ATMs in a 220v country, like in Europe, prior to plugging in the machine, the voltage selector switch on the back of the PSU needs to be switched to 220. The APC UPS that comes with the USA shipped Genesis Coin units is not 220v compatible, so it must be replaced with European 220v version (if needed for a quick short-term fix, against manufacturer recommendations, the UPS can be bypassed and all devices plugged directly into the 220v power). The only device that requires to be switched to be 220v compact is the PSU, by flipping the switch on the back of it.
Taken from “EB-Staff Chat Main”.