Purpose: This study aims to design an off-grid Solar Home System (SHS) to meet the daily electricity needs of a household with a 2,200 VA power capacity in Indonesia. The goal is to utilize Indonesia’s abundant solar energy potential to accelerate electrification and reduce its dependence on fossil fuels. Methodology/approach: This method involves identifying the household’s daily electrical load, which totals 16,325 Wh, including LED lights, refrigerators, air conditioners, and various other electronic devices. Based on this demand, the SHS system was designed using 20 solar panels of 200 Wp each (total 4,000 Wp), seven 12V 200Ah batteries (total storage of approximately 16,800 Wh), a 120A solar charge controller, and a 2,000W inverter. The design ensures that the system operates independently, without a connection to the national grid. Results/findings: The results show that the designed SHS can reliably supply the daily household electricity needs by storing sufficient energy for nighttime or cloudy conditions. This demonstrates that a household-scale solar power system is feasible and sustainable in a region with high solar radiation, such as Indonesia. Conclusion: The study concluded that SHS is an effective solution for residential electricity needs and supports the transition to renewable energy. However, the limitations include the lack of seasonal solar data analysis and economic feasibility assessment. The backup system design is also not considered. Limitations: Despite these limitations, the study contributes as a technical reference for SHS planning, supporting energy access initiatives, and clean energy adoption in remote or underserved areas. Contribution: This study provides a practical design reference for off-grid solar power systems in typical Indonesian households. It supports renewable energy adoption and rural electrification and encourages decentralized energy solutions using locally available solar resources.

Purpose: This study aims to develop a prototype for an integrated Cyber Academy e-learning web interface, enhancing effectiveness and user experience by combining its Learning Management System (LMS) and Project Management System (PMS). Methodology/approach: Using Design Thinking, the research began with empathy (interviews and surveys with students and teachers). After defining the problems, the Ideate phase focused on a unified interface design. Prototype development followed, and the prototype was rigorously tested with users via the System Usability Scale (SUS) method to evaluate usability and satisfaction. Results: Based on 49 respondents, the prototype achieved a SUS score of 79.75, categorized as "A" (excellent and acceptable usability). User feedback also indicated areas for future refinement Conclusions: This study successfully developed a highly usable and satisfying integrated e-learning web interface. Design Thinking was effective in creating a more functional, user-centred platform. Limitations: The study was limited to Figma prototype development and usability testing with registered Cyber Academy users, primarily from one institution; actual system implementation and broader testing were beyond the scope. Contribution: This study offers a practical framework for integrating e-learning and project management systems using Design Thinking, providing insights for Cybers Academy to improve its platform and serving as a case study for similar educational integration challenges.

Purpose: This study aims to design, develop, and evaluate an Android-based application for financial recording and order management tailored to a micro-enterprise (a lontong food stall) operated by Mr. Sutrisno, addressing the lack of structured transaction recording and disorganized order handling. Methodology/approach: Following a case-study approach in Indonesia, the application was built iteratively using Personal Extreme Programming (PXP) with Android Studio, Kotlin, and Room Database. Functional verification employed Black-Box Testing, while usability was assessed through Usability Testing (6 participants) and the UMUX-Lite questionnaire. Results/findings: Black-Box Testing yielded 100% pass rates across all core functions. Usability Testing showed that 100% of participants found the interface intuitive and input processes clear; all rated the financial recording and profit-loss reporting features as most beneficial, 50% regularly used the statistics module, and 83% reported no significant difficulties. UMUX-Lite produced an average score of 91.7, indicating very high perceived usability. Conclusions: The application successfully fulfills its objectives by combining reliable functionality with high user satisfaction, effectively streamlining financial and order processes for the target UMKM. Limitations: Findings are based on a single Android-only case study without iOS/web support, limited feature scope (basic income/expense recording and order organization), and a short evaluation period. Contribution: This research delivers a practical, user-centered solution for UMKM digitalization and provides a replicable development and evaluation framework for similar small business applications.