With modern business voice and data convergence, the business telephone system, with its multitude of IP servers channeling both voice and data through the same lines, looks more and more like a data centre. The growth of this technology however, has created an increased dependence on it. Consequently, controlled shutdowns are no longer acceptable. Businesses rely on, and expect power system availability for continuity of service – always. If the power stops, so does the business. Longer reserve power run times are necessary for converged data networks with IP telephony as well as system/data processing requirements which are commonly 24/7. On top of this, there are expectations of steadily rising energy costs and, continued growth in already significant business IT energy demand. This means there is a real need for finding new ways to make backup power systems operate with a high level of efficiency. New generation UPS and DC power systems can offer all of this.