We have tested 4 floor-mounted uninterruptible power supplies to find out how much they differ in efficiency, battery life and benefits per thousand rubles invested. In addition to the synthetic load, we used testing by servers, and also made sure of the quality of the sinusoid at the output of each of them. If you think all UPSs are the same, this article is for you. Double conversion uninterruptible power supplies, or, as they are more often called, On-Line models, are most often used to ...