…A UPS protects your computers, important equipment and all other devices you have plugged into it from four different power problems:
voltage sags (voltage is less than it should be)
total power failure
frequency differences (when the power is flowing at something other than 50 Hertz)
There are three types of UPS’s:
online double-conversion: the inverter constantly supplies a regulated voltage to the load and therefore transfer times are zero. This is the safest but most expensive power protection.
line-interactive: Similar to a standby UPS but includes a variable-voltage auto-transformer
offline/standby: Basic features, providing surge protection and battery backup, which is more for a small business or your home.
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The UPS was not invented by one particular person but is the culmination of a lot of different theories and studies. The most common reason for UPS failures is their batteries.
Consistent battery maintenance is required.
The lifespan of UPS batteries depends on many conditions:
environmental conditions
power quality
number of discharges
other batteries connected in the series
Three-phase UPS’s use either standard UPS batteries which are usually used in legacy units or plug-in-play batteries.
Standard batteries are difficult to change and require a manual testing procedure.
Plug-in-play batteries are automatically tested by the UPS and are designed for easier changing.