The Off-Grid systems with renewable sources of stochastic behavior's nature are facing to the issue of keeping the power quality parameters in national and international defined limits. This article aims on this problem by the application of data-mining. There is an attempt to uncover the influence between the variables of the system by synthesis of the classification rules. Next task that has to be solved and it is partly started in this article is to gain the robust strategy to keep this Off-grid systems stable and safety.