Solar panel efficiency requires consistent area for input and output calculations

Steps:

• Total output power is 1 kW for the system.
• Each panel has area 2 m² / 3 = 0.67 m².
• The statement "an area of 1 m² of each panel receives 0.8 kJ in 1 s" implies a receiving area larger than the physical panel area (0.67 m²), creating inconsistency.
• Without clarification on whether 1 m² is physical, projected, or standard area, input power cannot be calculated reliably.

Not enough information.

Final answer: Not enough information.