What is Off grid system?Off-grid system is suitable for areas without grid-connected or unstable grid-connected power. It can use the battery to back up, which can satisfy the load need for the rainy days or other urgent situations. Off grid system is usually composed of solar panels, connector, inverter, battery and mounting system Item NO. 2.5KW-20KW Off Grid Solar System System Type: Off Grid Solar System Solar Panel Type: Monocrystalline Solar Panel Battery Type: Lead Acid Battery/Lithium Ion Battery Charge Controller MPPT Inverter 2.5KW-20KW Off Grid PV Cable Black For STD, Red Optional 4mm2 Mounting System Roof/ Ground (Alumimum Alloy) Warranty 10 Years Customization Accepted