Solarity an enterprise working with PV systems is developing modbus drivers to get data from modbus devices (inverters, PV system loggers, energy meters, ...) and store its informations into csv files. Some files come from history beginnings and others have a higher level of abstraction where it becomes simple to add a new device with given documentation. You'll find basically SMA cluster controller, SMA inverter manager, SMA inverters, Schneider meter, Adtek meter, ABB inverters. See readme...