Specification: Maximum power: 80W ± 0.25W Working voltage: 18V±0.3V Working current: 6.66At0.15A Short circuit current: 4.44A ± 0.15A Open circuit voltage: 21V ± 0.8V Temperature coefficient voltage: (O.06510±0.15)%/°C Current temperature coefficient: -(160±10) mA / °C Power temperature coefficient: -(0.50.05)%/°C Maximum system voltage: 20V ambient temperature: -40 / °C - + 85 / °C (40 °F to 185 °F) Air resistance: 50pst (2400 Pascals) Snow protection: 113psi (5400 Pascals) Hail impact: 25 mm (1 inch), 23 m / s (52 mph) Net weight: 1800 g Gross weight: 2000 g Product size: 80 * 54 * 0.25cm / 31.49 * 21.25 * 0.09in Package List: 1 * 80W Single Crystal Solar Panel Note: 1. Do not scratch the surface of the solar panel with sharp objects. 2. Expose the solar panel to direct sunlight to ensure the fastest charging time during charging. 3. Do not place the charger on rainy days, as this may cause a short circuit. Tips: 1. Before use, please make sure that the positive and negative terminals of this product are connected to the positive and negative terminals of the charging product. 2. Unless you are a professional technician, do not attempt to modify the PCB circuit, otherwise we are not responsible for such results. 3. Best working time: 9:00-17:00 (mainly used for sunny weather) 4. Quality Assurance: 3 years of material and process assurance; ensure that the output power is 80% within 5 years, and the output power is 50% within 10 years. The power loss of the component was 3% during installation.