The Tigo EI Inverter quickly connects to the EI Battery and converts DC electricity from the solar modules into AC electricity for use in the home. Installers and homeowners have the flexibility to choose the size (from 3-15kW) and phase (1 or 3) to meet the needs of their solar project. Features and benefits include: 1 phase options: 3, 5, or 6kW; 3 phase options: 6, 10, or 15kW; Up to 150% DC oversizing; 50V start-up voltage; Built-in Wi-Fi and Cellular (optional); 152-month (12.6 year) warranty.