GREENTEK has proven its capability of manufacturing Widely-renowned, high-quality, and stable power output over its products’ lifespan (mind you, that is 12 and 30 years power output guaranteed!). It also adheres to a very strict quality control, doing 100% testing on module current and voltage to ensure that each customer only receives 100% solar modules. We use only high-efficiency cells in our modules. Special models are also manufactured for the specific needs of the customers, such as modules for architectural integration.