Solar power is one of the most efficient and environmentally-friendly ways to generate electricity. Solar panels convert sunlight into electrical energy that can be used to power homes and businesses. Solar systems can be used to generate both on-grid and off-grid power. On-grid solar systems are connected to the electrical grid and can power homes and businesses even when the sun is not shining. Off-grid solar systems are not connected to the electrical grid and must store their energy in batteries.