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Spikes
Electrical noise
Surges
Sags
Harmonics
Brownouts
Blackouts

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Regulated output with low harmonic distortion unaffected by input voltage or load changes

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1) Offline / Standby UPS
2) Line Interactive UPS
3) Online / Double Conversion UPS

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Minimal transition times between normal and backup noise

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Spikes are short duration rapid voltage transitions superimposed on the mains supply waveform

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High levels of reliability and efficiency

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Relatively low cost, weight and size requirement

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1) Storage
2) Design life
3) Sulphation / Undercharge
4) Overcharge
5) Temperature
6) Over Discharged
7) AC Ripple

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Common Mode noise + Normal Mode noise, causes sensitive equipment and computers to 'hang' or corrupt data.

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An input current with reduced harmonic distortion

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A low degree if electromagnetic interference and acoustic noise

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Power Factor = measure of how efficient the alternating current is being converted into useful work output, and a good indicator of the effect of the load current on the efficiency of the AC source

PF = Actual Power (W) / Reactive Power (VA)

Therefore, important to determine the load’s power factor before selecting the UPS rating

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Surges are sustained voltage increases above the normal mains supply value that last for more than one cycle

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Drops in main supply that can last for several cycles

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- Generally caused by non-linear loads which pull current from the mains supply in large peaks

- Can cause a disproportionate rise in current, resulting in increased temperature which will lead to component failure and general equipment overheating

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Same as sag but for longer and more serious, caused when main supply cannot cope with load demand

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Complete power loss, where the main source of power supply fails

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Inspect battery terminals and connections for corrosion 

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Inspect battery terminals and connections for corrosion 

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The efficiency of the alternating current that is converted into useful work output