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The online ups, sometimes called a true ups, is the best type you can buy. Paradoxically, it is both very similar to, and totally opposite to, the least-expensive type, the standby ups. It is very similar to it in that it has the same two power sources, and a transfer switch that selects between them. It is the exact opposite from the standby ups because it has reversed its sources: in the online ups the primary power source is the ups's battery, and utility power is the secondary power source.
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