What do the model number suffixes (E, C, D, N) mean for X3-Hybrid G2 inverter?

"E" indicates EPS function is available (requires external changeover device). "C" indicates no EPS function. "D" means the unit has a DC switch. "N" means it does not have a built-in DC switch (external required). The number (e.g., 5.0) indicates the kW rating.