With solar hot water, heat is captured directly from the sun through collectors installed on the roof and is transferred to the fluid circulating inside. Water is then stored in an insulated tank for future use. Solar power (PV)  converts light from the sun into electricity. The amount generated depends on the number of panels and size of the inverter. Any excess power can be sold back into the grid or stored in a battery, while additional electricity can be bought from the grid when the sun is not shining