Yes, the PV array DC capacity can exceed the inverter AC capacity. The value of DC/AC ratio for each type of inverter is listed in its datasheet. A typical rule of thumb is that the PV array can be oversized by 20%. This is dependent on location and site irradiation levels. Excessive PV array oversizing will waste money and cause some impact to inverter’s reliability. If you are in doubt of oversize designing please contact your local AISWEI technical expert.