An 18kW solar system can generate 18 kilowatts of power under ideal conditions, typically comprising around 44-60 solar panels depending on the efficiency and wattage of the panels used. . Estimates the energy production of grid-connected photovoltaic (PV) energy systems throughout the world. It allows homeowners, small building owners, installers and manufacturers to easily develop estimates of the performance of potential PV installations. Operated by the Alliance for Sustainable. . r generation in the United States. One of the first applications of concentrated which energy is produced or consumed. Watts (W) measur rates of power over a period f time. That's the wattage; we have 100W, 200W, 300W solar panels, and so on. South. . An 18kW solar system is an excellent choice for large homes or medium to large businesses with substantial energy needs. This article will explore the costs associated with an 18kW solar system, factors influencing these costs, the financial incentives available, and the potential return on. . 18kW Solar System: Price, Load Capacity, How Big, and More - Solar Panel Installation, Mounting, Settings, and Repair.