Grape Solar CS-P-270-DJ 270 Watt Polycrystalline PV Solar Panel 10 year limited product warranty on materials and workmanship, 25 year limited power warranty on power output High transmittance, low iron tempered glass with enhanced stiffness and impact resistance Unique frame design with high mechanical strength for easy installation This solar panel can be used for on-grid or off-grid applications Outstanding electrical performance under high temperature and low irradiance conditions