These Home UPS Features are : Tick Microprocessor based design Tick Automatic line-to-battery switchover Tick Intelligent 2-stage charger Tick High efficiency DC to AC conversion Tick Over load protection Tick Compact rack tower design The energy efficient inverters are designed to meet international standards for quality and high performance. NUMERIC Digital HPH Series converts DC power to clean modified sine wave AC power that is ideal for residential and office appliances.