On-grid solar power plant (also known as Grid-connected or Grid-tied), which are directly connected to the distribution grid, use grid connected inverters and usually do not connect with batteries. These systems can export surplus power into the distribution grid. An On-grid solar power plant is designed to automatically shut down if it detects anomalies in grid parameters such as voltage, frequency, etc.
Off-grid solar power plant (also known as standalone) which are isolated from distribution grid usually, use standalone inverters with batteries.