ELGlossary
A
- AC EfficiencyDifficulty 2 of 3
- Indicates how efficiently a UPS converts incoming AC power into usable output power during normal operation.
- AC RippleDifficulty 3 of 3
- Small unwanted AC voltage that can appear in the DC output of a UPS. It can damage batteries over time if not properly filtered.
- AHDifficulty 1 of 3
- Ampere-hour (Ah) represents a battery’s total storage capacity. It shows how much current a battery can supply over time.
- Alarm ContactDifficulty 2 of 3
- A relay output on a UPS or monitoring device used to signal alarm conditions to external systems.
- Ambient TemperatureDifficulty 1 of 3
- The surrounding temperature of the environment where UPS or batteries are installed.
- ATS (Automatic Transfer Switch)Difficulty 2 of 3
- A device that automatically transfers load between power sources such as utility and generator.
- Auto RestartDifficulty 1 of 3
- A UPS feature that automatically restarts the system after utility power returns following a shutdown.
- Automatic Voltage Regulator (AVR)Difficulty 1 of 3
- A device that automatically maintains a constant voltage level to protect electrical equipment from fluctuations.
- AutonomyDifficulty 2 of 3
- The time a battery-powered system (like a UPS) can continue operating critical loads after a power failure.
B
- Battery BankDifficulty 2 of 3
- A group of batteries connected together to increase total backup time or capacity.
- Battery Charging CurrentDifficulty 2 of 3
- The amount of current supplied to charge a battery, regulated by the UPS system.
- Battery Management System (BMS)Difficulty 2 of 3
- A system that monitors and manages the performance, health, and charging of batteries.
- BlackoutDifficulty 1 of 3
- A complete and sudden loss of electrical power from the grid.
- BypassDifficulty 2 of 3
- An alternative power path in a UPS that allows the load to continue receiving power during UPS maintenance or faults.
C
- Capacity SystemDifficulty 3 of 3
- A parallel UPS setup where all modules contribute exactly enough to meet the total load, without redundancy.
- Circuit ProtectionDifficulty 2 of 3
- Methods used to prevent damage from electrical faults like overcurrent or short circuit.
- Cold Start FunctionDifficulty 2 of 3
- A feature that allows a UPS to be started directly from the battery without utility power.
- Cooling FanDifficulty 1 of 3
- A built-in fan in UPS or batteries used to dissipate heat during operation.
D
- DC EfficiencyDifficulty 2 of 3
- Measures how effectively a UPS converts battery power into output power during battery mode.
- DC VoltageDifficulty 1 of 3
- Refers to the direct current (DC) voltage level, typically that of a UPS battery.
- Double ConversionDifficulty 3 of 3
- A UPS topology where incoming AC is converted to DC and back to AC, ensuring stable output regardless of input conditions.
- Double Conversion EfficiencyDifficulty 3 of 3
- Indicates how efficiently a UPS in double conversion mode delivers power, especially as the load increases.
- Dry ContactDifficulty 2 of 3
- A passive relay contact used to transmit status signals without applying voltage.
E
- Electromagnetic Interference (EMI)Difficulty 2 of 3
- Unwanted electrical noise or interference that can disrupt electronic equipment operation.
- EMC (Electromagnetic Compatibility)Difficulty 3 of 3
- The ability of a device to operate without interfering with or being affected by other electrical devices.
- Emergency Power Off (EPO)Difficulty 2 of 3
- A safety feature that allows immediate shutdown of power to connected systems in an emergency.
- EV Connector Type 2Difficulty 1 of 3
- A standard charging plug for electric vehicles used widely in Europe.
F
- Fast ChargingDifficulty 2 of 3
- A technique that allows batteries to charge quickly without damage, using advanced charge control technology.
- Float ChargingDifficulty 2 of 3
- A continuous low-level charging method to keep UPS batteries full and prolong their lifespan.
- FrequencyDifficulty 1 of 3
- The rate at which AC power cycles per second, usually measured in Hertz (Hz).
G
- GeneratorDifficulty 2 of 3
- A backup power system that automatically starts and supplies electricity during grid failure.
- Ground FaultDifficulty 2 of 3
- An unintentional electrical path between a power source and a grounded surface.
H
- Harmonic DistortionDifficulty 3 of 3
- Waveform distortion in electrical signals, often caused by non-linear electronic loads.
- Hot-swappable BatteriesDifficulty 2 of 3
- Batteries that can be replaced without turning off the UPS or disconnecting the load.
I
- Input Power CordDifficulty 1 of 3
- The cable that connects the UPS to the AC power source.
- Input Voltage WindowDifficulty 2 of 3
- The range of acceptable input voltages that a UPS can operate within without switching to battery.
- Inrush CurrentDifficulty 2 of 3
- The initial surge of current required when electrical equipment is first powered on.
- InverterDifficulty 2 of 3
- The component inside a UPS that converts DC power from batteries back to usable AC power.
- IsolationDifficulty 2 of 3
- Electrical separation between input and output circuits to prevent faults or interference.
K
- kVA (kilovolt-ampere)Difficulty 1 of 3
- A unit that defines the apparent power of electrical equipment. 1 kVA = 1,000 VA.
L
- Line ConditionerDifficulty 2 of 3
- A device that improves power quality by regulating voltage and filtering noise.
- Line Interactive UPSDifficulty 2 of 3
- A UPS system that regulates voltage using an automatic voltage regulator before switching to battery.
- Lithium-ion BatteryDifficulty 2 of 3
- A modern battery type known for high energy density, long life, and fast charging capabilities.
- LoadDifficulty 1 of 3
- Any device or system connected to a power source and drawing electrical current.
- Load SheddingDifficulty 2 of 3
- A method used to prioritize power delivery by disconnecting non-critical loads during outages.
M
- Maintenance BypassDifficulty 2 of 3
- A manual switch used to isolate the UPS for servicing while still supplying power to the load.
- ModbusDifficulty 3 of 3
- A communication protocol used for connecting industrial electronic devices, including UPS systems.
- ModularDifficulty 3 of 3
- A UPS design where independent modules can be combined to meet power and redundancy needs.
- MTBFDifficulty 2 of 3
- Mean Time Between Failures – The average time a device operates before experiencing a failure.
- MTTR (Mean Time To Repair)Difficulty 2 of 3
- The average time it takes to repair a system after a failure occurs.
N
- Network Management Card (NMC)Difficulty 2 of 3
- An interface card enabling remote monitoring and control of UPS systems via network.
- Noise (Electrical)Difficulty 2 of 3
- Any unwanted electrical signal that interferes with normal operation of equipment.
O
- Online (Double Conversion) UPSDifficulty 3 of 3
- A UPS that constantly converts incoming AC to DC and back to AC to provide clean, uninterrupted power.
- Overcurrent ProtectionDifficulty 2 of 3
- A system designed to interrupt excessive current to protect UPS and loads.
- OverloadDifficulty 2 of 3
- A condition where the connected load exceeds the UPS capacity.
- OvervoltageDifficulty 2 of 3
- An abnormally high voltage that can damage connected equipment.
P
- Patch PanelDifficulty 1 of 3
- A hardware unit used in networking to manage and route data cables.
- Peak LoadDifficulty 2 of 3
- The highest amount of power drawn by connected equipment during operation.
- PhaseDifficulty 2 of 3
- Describes how electrical current flows in AC systems, either single-phase or three-phase.
- Power ConditioningDifficulty 2 of 3
- The process of cleaning and stabilizing power before it reaches sensitive equipment.
- Power FactorDifficulty 2 of 3
- A measure of how effectively electrical power is being used by a system.
- Power FailureDifficulty 1 of 3
- A total loss of electrical power supply from the utility.
- PV InverterDifficulty 2 of 3
- A device that converts DC electricity from solar panels into AC electricity for use or grid feed-in.
R
- Rack Unit (U)Difficulty 1 of 3
- A standardized height unit used to describe vertical space in server and UPS racks.
- Rack-Mount UPSDifficulty 1 of 3
- A UPS system designed to fit into a server or equipment rack.
- Rectifier/ChargerDifficulty 3 of 3
- A UPS component that converts AC to DC and charges the battery.
- RedundancyDifficulty 3 of 3
- The duplication of critical components in a system to ensure continuous operation if one part fails.
- Redundant Power SupplyDifficulty 2 of 3
- Backup power supply built into equipment to maintain uptime if the main fails.
- Remote MonitoringDifficulty 2 of 3
- The ability to observe and manage UPS performance over a network from another location.
- RFI — Radio Frequency InterferenceDifficulty 2 of 3
- High-frequency noise from electronic equipment that can affect wireless communication.
- RightsizingDifficulty 2 of 3
- Selecting UPS capacity to match current load and scale with future needs, avoiding over-sizing.
- RuntimeDifficulty 1 of 3
- The amount of time a UPS can power equipment after a power failure.
S
- ScalabilityDifficulty 2 of 3
- The ability of a UPS system to expand capacity by adding additional modules or batteries.
- Serial PortDifficulty 2 of 3
- A communication port on a UPS used to connect and transmit signals to computers or monitoring equipment.
- Short CircuitDifficulty 2 of 3
- An abnormal connection of low resistance causing excessive current flow.
- Signal ConditioningDifficulty 3 of 3
- Adjusting electrical signals to meet required standards for equipment performance.
- Single-phase PowerDifficulty 1 of 3
- An electrical system with one alternating current (AC) voltage phase, commonly used in homes and offices.
- Six Nines AvailabilityDifficulty 3 of 3
- A high standard of system reliability, meaning 99.9999% uptime with minimal downtime per year.
- Smart ChargingDifficulty 2 of 3
- Technology that optimizes battery charging based on usage patterns and environmental factors.
- SNMPDifficulty 2 of 3
- A standard network protocol used to monitor and control devices like UPS systems over a network.
- Static BypassDifficulty 2 of 3
- A built-in UPS function that automatically routes power around internal electronics in case of failure.
- Static SwitchDifficulty 3 of 3
- A solid-state device used to transfer power paths instantly between UPS and bypass.
- Surge ProtectorDifficulty 1 of 3
- A device that protects electrical equipment from voltage spikes or surges.
T
- Three-phase PowerDifficulty 2 of 3
- A power system with three AC voltages, used in industrial or high-load applications.
- Total Cost of Ownership (TCO)Difficulty 2 of 3
- All direct and indirect costs associated with the purchase, maintenance, and operation of UPS systems.
- Transfer SwitchDifficulty 2 of 3
- A device that switches load between power sources such as UPS and generator.
- Transfer TimeDifficulty 1 of 3
- The delay between a power failure and when the UPS starts supplying power from the battery.
- TransformerDifficulty 2 of 3
- An electrical component that changes voltage levels or isolates circuits.
- Transformer-basedDifficulty 3 of 3
- Traditional UPS design using internal transformers to regulate voltage and provide isolation.
- Transformer-lessDifficulty 3 of 3
- Modern UPS design that omits bulky transformers to improve efficiency and reduce size.
U
- UPS (Uninterruptible Power Supply)Difficulty 1 of 3
- A device that provides backup power and protects equipment from power disturbances.
- USB PortDifficulty 1 of 3
- A USB interface used for communication between UPS and computers.
- User-Replaceable BatteriesDifficulty 1 of 3
- UPS batteries that users can safely replace on their own, without needing a technician.
V
- Volt (V)Difficulty 1 of 3
- The unit of measurement for electric potential or voltage.
- Voltage DropDifficulty 1 of 3
- A decrease in voltage level in a circuit due to resistance or high load.
- Voltage Regulation RangeDifficulty 2 of 3
- The range within which a UPS can regulate voltage output to remain stable.
- Voltage SpikeDifficulty 2 of 3
- A short, high-voltage surge that can damage electronic equipment.
- VRLA BatteryDifficulty 2 of 3
- A sealed battery type used in UPS systems, requiring minimal maintenance and ventilation.
W
- Watt (W)Difficulty 1 of 3
- A unit of power measuring the rate of energy consumption or output.
Z
- Zero Transfer TimeDifficulty 3 of 3
- A feature of online UPS systems where the switch to battery power occurs with no delay.