1. Because grid-connected inverters are designed to invert a fluctuating direct current (DC) power from a solar panel to alternating current (AC) electricity, because the sun's rays are always changing. Therefore, and the battery voltage changes require grid-connected inverter has a certain degree of automatic adjustment capability.
2. In order to generate more power, it is necessary to have a maximum power tracking device, MPP point.
The role of the grid-connected inverter is to convert the direct current (DC) power from the square of the solar cell module into alternating current (AC) power at the same frequency as the grid voltage. The inverters can be either centralized or cascaded, allowing later expansion of the solar power system.