A solar system inverter is a device that converts direct current (DC) to alternating current (AC). Solar system inverters are used in solar power systems to convert the DC output of solar panels into AC for use in the electrical grid or for powering appliances. There are two types of solar system inverters: grid-tie inverters and off-grid inverters. Grid-tie inverters are used in grid-connected solar power systems, while off-grid inverters are used in off-grid solar power systems.