The DSP-120 19″ Modular Inverter System consist of a 19″ 6RU shelf with up to 6 inverter modules. Two options are available include 1KVA modules and 2.5KVA modules. These options are not interchangeable. Static and manual bypass switches are not available with the 19″ shelf. An optional remote monitoring module with TCPIP, HTML and SNMP is available and will use the 6th slot. With the addition of an expansion shelf up to 25KVA using 2.5KVA modules can be provided.