E

Efficiency The ratio of the output power from the UPS to the input power from the utility. This shows the percentage of the input power that is available as useful output power. For example, a UPS that is 95% efficient delivers 95% of the utility power it receives to the load. The remaining power takes the form of dissipated heat.

EMC Electro Magnetic Compatibility.

Emergency Shutdown Used to instantly or quickly shutdown all of the electrical power available to the UPS and the load. An emergency shutdown device is usually used during a crisis to prevent damage to the UPS and the load. Some computer-room installations require a Remote Emergency Power Off (REPO) capability as part of their security/safety system.

Equalize This is the process of increasing the Float Voltage to the Equalize Voltage to recharge or equalize the batteries.

Event An alarm activation or de-activation.