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All Journal Jurnal Penelitian Rumpun Ilmu Teknik Jurnal Elektro Kontrol (ELKON)
Yohanes Ragil Purnomo
Politeknik Negeri Cilacap
Computer Science & IT Electrical & Electronics Engineering Engineering

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ANALISIS TEKNO-EKONOMI PENERAPAN PLTS OFF-GRID BERBASIS SISTEM DC UNTUK PENERANGAN RUMAH SUBSIDI Asa Taufiqurrahman; Yohanes Ragil Purnomo; Fadhil Muhammad Nuryanto
Jurnal Elektro Kontrol (ELKON) Vol. 6 No. 1 (2026): Jurnal ELKON
Publisher : Teknik Elektro Fakultas Teknik Universitas Muria Kudus

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24176/elkon.v6i1.17454

Abstract

This study analyzes the implementation of a direct current (DC)-based off-grid photovoltaic (PV) system to meet the lighting energy demand of a Type 33/60 subsidized house. The assessment was conducted using a techno-economic approach, including energy demand analysis, system component sizing, performance simulation using PVSyst software, and economic evaluation through the Levelized Cost of Energy (LCOE) and Net Present Cost (NPC) methods. The results indicate that the house lighting system requires 461 Wh/day of energy with a total installed load of 63 W. The proposed system consists of a 160 Wp solar module, a 12 V 180 Ah battery, and a 10 A MPPT solar charge controller (SCC). PVSyst simulation results confirm that the system is capable of supplying an annual energy demand of 168.26 kWh/year, achieving a Solar Fraction of 100% and a Performance Ratio of 59.04%, with no missing energy or loss of load throughout the simulation period. The economic analysis shows an LCOE of IDR 5,236/kWh and an NPC of IDR 11.26 million over a 25-year project lifetime. These findings demonstrate that a DC-based off-grid PV system has significant potential as an independent, efficient, and sustainable energy solution for subsidized housing lighting applications, particularly in areas that are not yet connected to the electricity grid.
Exploring the Factors of Focus Group Discussions in Developing Vocational Students’ Speaking Skills Yoana Gita Pradnya Lengari; Yohanes Ragil Purnomo; Yuniarmelinda Ikha Meru Brahmanty; Dwi Ratih Nolaputri
Jurnal Penelitian Rumpun Ilmu Teknik Vol. 5 No. 3 (2026): Jurnal Penelitian Rumpun Ilmu Teknik
Publisher : Lembaga Pengembangan Kinerja Dosen

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55606/juprit.v5i3.6769

Abstract

In vocational higher education, traditional teacher-centered instruction focused on grammar often leaves students with high communication anxiety and limited opportunity for authentic speaking practice, despite growing regional industrial demands in Cilacap Regency. This study investigated the implementation of Focus Group Discussions (FGDs) to explore factors contributing to students’ speaking skill improvement and identify the defining characteristics of student interaction. Using a descriptive qualitative method integrated with quantitative data triangulation within a collaborative research framework, the study involved 28 second-semester Agro-industrial Product Development study program at Politeknik Negeri Cilacap. Data were collected using quantitative pre and post-test combined with qualitative participatory observation and in-depth interviews. The quantitative results showed a 36,97% improvement in speaking fluency and a 72,28% increase in vocabulary mastery. Qualitatively, key factors supporting these improvements included reduced speaking anxiety through small-group peer scaffolding, active vocabulary use driven by practical topics such as marketing strategies and packaging design, along with strategic code-switching to handle language gaps. Interactional patterns shifted from passive reliance on the lecturer and long pauses into spontaneous turn-taking, active negotiation of meaning, and mutual problem solving. The study demonstrates that FGDs effectively serve as a supportive pedagogical tool for developing vocational students’ speaking skills.
Co-Authors Asa Taufiqurrahman Dwi Ratih Nolaputri Fadhil Muhammad Nuryanto Yoana Gita Pradnya Lengari Yuniarmelinda Ikha Meru Brahmanty