In China, Tiantech is not only a professional manufacturer of photovoltaic panels, solar inverters, lead-acid batteries, and lithium batteries, but also a supplier of a complete set of home and commercial grid connection systems, off grid systems, and hybrid systems.Grid-connected directly input electric energy into the public grid through the grid-connected inverters without passing the storage battery.Off-grid system is maily composed of solar battery, off grid inverter, battery and mounting system. For hybrid solar system it can be described as off-grid solar system with utility backup power, or grid-tied solar system with extra battery storage. In order to make sure the customer cost control and the reliability of the system, t is necessary to place some emphasises on the following questions for customization and designing.