The Modbus client can monitor up to 32 inverters (nodes). See the iE 150 ASC 150 and ASC-4 Solar Modbus client tables for the data that can be monitored for each inverter protocol.
In the Modbus server, 70 registers are reserved for each inverter. The iE 150 Battery Solar Modbus server tables and the ASC 150 Modbus server tables only list the addresses for the first inverter (input register (04), addresses 47000 to 47069). The other inverters follow consecutively. Additional inverter monitoring data is in the input register (04), addresses 49940 to 49961.
In general, data from the inverters supported by the PV protocol (parameter 7561) is supported. However, the available data depends on the inverter make, model and interface.