On-line UPS’s use power to charge the battery and then operate the inverter.
This power is paid for by you the user of the UPS.
This power, used by the UPS to protect and support your computer and equipment is between 5 and 20 % of the power used.
A line interactive UPS uses less power, because the inverter does not operate unless there is a power failure.
A line interactive UPS is generally cheaper than an on-line unit in price and in running costs.
A line interactive UPS is generally smaller than an on-line UPS,
An on-line UPS has a more stable output than a line interactive unit.
Most modern on-line UPS’s do not have isolation between the input power and the output power.
If the input is not isolated from the output, the equipment connected to a UPS can be affected by noise and distortion of the neutral line.
Most equipment including PC’s do not require a sinusoidal (sine) waveform as the power supply converts the waveform to DC (direct current).
Batteries are an essential part of any UPS system and should be replaced every 3 to 5 years (depending on supply conditions, this could even be sooner) unless the batteries are rated at a higher life expectancy.
Sometimes it will cost 60% of a small UPS’s cost to replace the battery, but this could still be worth doing due to the higher specification of the replacement battery.
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