Can we connect the output of UPS system with different power ratings (different kVA) to a single bus and the load will be shared based on their kVA rating?
In case of parallel UPS (see description below) it is not possible to have different power ratings in the same system.
UPS system are widely used in parallel configurations. The main reasons are:
UPS systems in parallel, is actually one system made of parallel UPS modules, who has one output.
The UPS modules in the same system are always of the same power rating and from one sole manufacturer.
Each UPS module is supplying equal power to the load (load sharing).
Carlo Kufahl is the Product Manager for 3-phase modular UPS at the center of excellence for UPS, Power Protection Product Group of ABB, Quartino, Switzerland. He joined in 2010 and as a Sales Engineer for two years and then he took over as Product Manager. Today he coordinates and manages the complete life cycle of the 3-phase modular UPS which includes pre-development, development, launch, sales and phase out of products. Carlo holds a Bachelor’s degree in Electrical Engineering from the University of Applied Sciences and Arts of Southern Switzerland. Carlo also holds a Master in Business Administration obtained at Zürich University of Applied Sciences.
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