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The purpose of this research was to develop a learning management system on solar power and its applications in accordance with the STEM methodology for Matthayom Suksa 3 students and to determine its efficiency and find out the level of students satisfaction. The population of the study consisted of 20 Matthayom Suksa 3 students at Ban Huayplalod School, Mae Sot district, Tak province. The students were enrolled in learning of careers and technology in the first semester of the 2017 academic year. The research tools were a learning management system on solar power and its applications in accordance with the STEM methodology, and qualitative evaluation form of a lesson plan on STEM, and an achievement test. The statistics used for data analysis were mean and standard deviation. The results of the research revealed that the quality of the learning management system was at the good level ( = 4.13, S = 0.15). The efficiency of the learning management system was at 82.37/84.50, which was higher than the specified criteria of 80/80. Student satisfaction was at the most level (µ = 4.67, σ = 0.19).
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