Available in three/single-phase (10/15/20 kVA) and mono/mono (6/10 kVA) versions, with DSP microprocessor control for the best reliability. This inverter is provided with IGBT, PWM technology, VFI-SS-111 double conversion (Voltage Frequency Independent by the CEI-EN62040-3), unitary power factor, LCD display, RS232 communication port and intelligent slot for AS400-SNMP, communication software, upgradable batteries, internal maintenance manual by-pass; up to 3 units can work in parallel mode.