Use of transformerless technology results in a significant reduction in volume and weight of the UPS also improving the important ratio between power and foot print of the UPS. Because there is no transformer at the output of the inverter, the electrical losses of equipment decrease and efficiency increases. Increased efficiency lowers the cost of consumed electricity. In addition a transformerless UPS has lower accoustic noise. DC voltage level of traditional UPS is low, so in order to generate enough AC voltage at output, it needs a step up transformer in the inverter. The DC voltage level in transformerless UPS is already high enough, so there is no need for a step up transformer to be used.