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This is to certify that your paper entitled «Techno-economic Optimization of a Stand-alone Photovoltaic-battery Renewable Energy System for Low Load Factor Situation- a Comparison between Optimization Algorithms» was indexed with 10 pages, in the CIVILICA citation database, code COI:JR_IJE-30-10_016, after evaluation and approval of the referees of the "International Journal of Engineering (IJE) Vol 30, Issue 10 , Year 2018.

While offering our congratulations on the indexation of your paper, please be informed that this certificate is prepared based on the information submitted by the secretariat of the above journal and the information contained in the CIVILICA database, and the accuracy of its content can be inquired at any time through link provided at the bottom of the page or scanning the code image.