An online UPS uses a "double conversion" method of accepting AC input, rectifying to DC for passing through the rechargeable battery (or battery strings), then inverting back to 120 V/230 V AC for powering the protected equipment.
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This specification defines technical requirements for the supply of the equipment and is written as an overlay to IEC 62040-3, following the IEC 62040-3 clause structure. Clauses from IEC 62040-3 not amended by this specification apply as written.
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There are three basic types: diesel, hybrid, and simple mechanical flywheel backed UPS units. Diesel rotary units are generally noisy and are only available in higher (500 to 1,600 kVA) power ranges. They contain a device often referred to as an induction type coupling.
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