OPTI-UPS DS160KD33 - Manual (Page 6)

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Besides, the knowledge of choosing the best and most suitable UPS can be easy or
can be difficult, it depends on whether you know the key points or not. The most
obvious specification is the power, it depends on how large is your load. Usually, an
allowance of 50% more power must be added to the current power you needed, both
for tolerance and future expansion. Of course you can add more than 50% if you
expect a larger increase of load in the future.
Another important point is the reliability, the prime aim of a UPS is to protect your
load, and therefore the UPS should be much more reliable than the AC source.
Those unfortunate UPS users who bought a unreliable UPS may suffer the
problem of frequent break down of the UPS, even more frequent than AC failure,
the cost of repairing is more the cost of the unit itself.
The last point is to choose an honest and experienced suppler who can help you
to choose the correct UPS, react promptly in case of UPS problem. Then, you can
save your money as well as buy a correct, suitable, and reliable UPS that is the
same as buy insurance to your load.
Generally, there are four different modes of operation, the NORMAL OPERATION
MODE, the BACK-UP (BATTERY) MODE, the RESERVE MODE and the
MAINTENANCE BYPASS MODE. They are explained as below.
Normal Operation Mode:
The rectifier converts the AC input to DC power to supply the inverter and charge the
battery simultaneously. All the fluctuations, surges and spikes of the AC input is
removed during AC to DC conversion, therefore the AC supplied by the inverter is
clean and stable.