Online Double Conversion UPS Systems

Online Double Conversion UPS Systems are considered to provide the best power protection available. Most modern systems provide a sine-wave inverter which is always on – hence ‘online’. As a result the output is independent of the input giving the classification VFI: Voltage and Frequency are Independent from the input voltage. However, actually technically this may not be true as in many cases the output frequency will track the input frequency (in case a revert to bypass is required).

Online UPS Power Flow in Normal Operation

In normal operation, the AC power feeds the rectifier / charger which maintains a float charge on the batteries and converts the AC power to a DC power “bus” which feeds the inverter circuit, which converts DC to a stable AC power waveform. Hence the term “double conversion”.

Online UPS Power Flow on Battery Power

Should the mains fail – or go out of tolerance – too high that exceeds design parameters or too low that current input is unsustainable then the unit will revert to battery power. At which point the input mains is disconnected and the DC bus will be maintained from the batteries. This is seamless and the inverter is operating all the time, meaining this is a true “no break” technology.

The drawback of online technology is the high fan noise (some systems have automatic fan speed reduction at low loads) and lower efficiency than other technologies (usually in the order of ~90%). As a consequence many manufacuturers have incorporated “ECO Mode”, however if you want to operate in ECO mode a sine wave line interactive UPS System would be a better option.

Matching Products for Online Double Conversion UPS Systems

KR1000L-J 1KVA/700W Extended Run UPS

KR1000L-J 1KVA/700W Extended Run UPS

1KVA / 700W Online Double Conversion Uninterruptible Power Supply, with high capacity charger for long runtime applications. The unit contains no…

VFI1000T 1KVA/900W Online UPS System

VFI1000T 1KVA/900W Online UPS System

Fully featured online double conversion UPS in compact tower format. Unit contains 3x12V 9Ah internal batteries but runtime can be…

VFI1500B 1.5KVA/1350W Online UPS System

VFI1500B 1.5KVA/1350W Online UPS System

The VFI1500B is a fully featured online double conversion UPS System with 1500VA and 1350W rating that can be rack…

KR3000L-J Extended Run 3KVA/2.1KW UPS System

KR3000L-J Extended Run 3KVA/2.1KW UPS System

3KVA / 2100W Online Double Conversion Uninterruptible Power Supply, with high capacity charger for long runtime applications. The unit contains no…

VFI3000B 3KVA/2.7KW Online UPS System

VFI3000B 3KVA/2.7KW Online UPS System

The VFI3000B is a fully featured online double conversion UPS System with 3KVA and 2700W rating that can be rack…

VFI3000T 3KVA/2.7KW Online UPS System

VFI3000T 3KVA/2.7KW Online UPS System

Fully featured online double conversion UPS in compact tower format. Unit contains 6x12V 9Ah internal batteries but runtime can be…

VFI3000BL 3KVA/2.7KW Extended Run Online UPS System

VFI3000BL 3KVA/2.7KW Extended Run Online UPS System

The VFI3000BL is a fully featured online double conversion UPS System with 3KVA and 2700W rating that can be rack…

VFI6000BL 6KVA 5400W Extended Run Rack/Tower UPS

VFI6000BL 6KVA 5400W Extended Run Rack/Tower UPS

The VFI6000BL is a true online double conversion UPS System in a rack/tower format. The unit does not contain internal batteries…

VFI10KT 10KVA 9KW UPS System

VFI10KT 10KVA 9KW UPS System

Fully featured 10KVA, 9KW Rated single phase online double conversion UPS in compact tower format. Unit contains 16x12V 9Ah internal…

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