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ITGlossary · Power quality
Voltage Regulation Range
The input voltage range over which a UPS or stabilizer keeps its output close to 230 V without drawing on the battery.
Technical level:Intermediate
The voltage regulation range shows within what limits the mains voltage can vary without the UPS or stabilizer having to fall back on the battery, while still keeping the output close to 230 V. In specifications it usually appears as the input voltage range, together with the output voltage accuracy.
Line-interactive UPS units and AVR stabilizers correct the voltage in steps, boosting or reducing it. Double-conversion (online) UPS units deliver a very stable output, typically accurate to about ±1–2%. In areas with frequent sags or high voltage, a wide range means fewer transfers to battery and longer battery life.
Compare the range at your actual load: on some models the lower limit applies only at reduced load, which is stated in the notes of the datasheet.
Related terms
- Input Voltage WindowThe range of mains voltage within which a UPS keeps powering the load from the grid without switching to battery.
- Line Interactive UPSA UPS that corrects voltage sags and swells with an automatic voltage regulator and switches to battery only when the voltage is lost or out of range.
- AC RippleA small unwanted AC component on the DC charging voltage of a UPS that heats the batteries and shortens their life.
- Automatic Voltage Regulator (AVR)A device that automatically maintains a constant voltage level to protect electrical equipment from fluctuations.
- Line ConditionerA device that improves power quality by regulating voltage and filtering noise.
- Noise (Electrical)Unwanted high-frequency disturbances on the supply voltage, e.g. from motors or power supplies, which UPS systems and line conditioners filter out.