These panels typically measure about 5.4 feet by 3.25 feet, weigh 26 to 28 lbs for portable versions, and use standard MC4 connectors. Key Specifications includes; Power Output: 450W nominal powerVoltage Options: Available in 24V, 36V, or 48V configurations (and ~37V to 41V for portable units)Cell Type: Monocrystalline siliconEfficiency: Roughly 23% for high-quality models