How Many Solar Panels Do You Actually Need? A solar system isn't defined only by its total kW rating. The number of panels you need depends on your target system size and the wattage of the panels you choose. For example: A higher-wattage panel can achieve the same system capacity with fewer panels than a lower-wattage panel. SolarBazaar's Solar Panel Quantity Calculator helps estimate the number of panels required for your target system size. Use the calculation as a planning starting point before comparing equipment and installation options. Calculate your estimated panel count: https://solarbazaar.io/calculators