LDK 230w Polycrystalline solar panels 1,Using high quality Motech solar cell. 2,Certificate: IEC, ... Standard testing condition: 25, AM1.5 spectrum, 1,000W irradiance Insulation: >100M Ohms Voltage stand-off: 2,000V AC and 3 ... condition: 25 degrees Celsius, AM1.5 spectrum, 1,000W irradiations Insulation: ≥100M Ohms Voltage stand-off: 2,000V AC, 3,000V ...