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All Journal JMPM (Jurnal Material dan Proses Manufaktur) Journal of Renewable Energy and Mechanics Indonesian Journal of Energy
Patria, Mochamad Febrian Adhi
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Automotive Engineering Energy Engineering Industrial & Manufacturing Engineering Mechanical Engineering Social Sciences

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Performance Evaluation of 120 kWp On-Grid Photovoltaic Power Plants after Five Years of Operation Umam, Mukhamad Faeshol; Patria, Mochamad Febrian Adhi; Affandi , Dani Maulana; Nugraha, Deva Harry; Kurniawan, Hanifah Dwi; Ramadani, Havid Pandu
Indonesian Journal of Energy Vol. 8 No. 2 (2025): Indonesian Journal of Energy
Publisher : Purnomo Yusgiantoro Center

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Abstract

This study assesses the five-year operational performance of a 120 kWp grid-connected rooftop photovoltaic (PV) power plant with multiple locations in Blora, Central Java, Indonesia.  By analyzing real-world energy yield, degradation rates, and climate-related impacts, the study identifies key environmental and technical factors influencing PV efficiency.  Performance data from 2020 to 2025 show varying degrees of degradation across sites, with Widya Patra 3 showing the greatest reduction (51.09%), and Widya Patra 2 showing the least (12.5%).  The study confirms that dust accumulation, shading, temperature fluctuations, and humidity have a significant impact on long-term efficiency.  Climate variables such as sunshine duration, rainfall intensity, and wind speed were found to have a direct relationship with energy yield.  These findings highlight the importance of regular maintenance, proactive cleaning strategies, and optimized PV system designs for better performance and sustainability in tropical climates.  The study sheds light on future PV reliability improvements, guiding the implementation of climate-resilient strategies in solar energy development. 
A Case Study of Risk-Based Inspection Implementation in Diesel Fuel Distribution Pipelines Patria, Mochamad Febrian Adhi; Umam, Mukhamad Faeshol; Krisdiyanto
JMPM (Jurnal Material dan Proses Manufaktur) Vol. 8 No. 2 (2024): December
Publisher : Universitas Muhammadiyah Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18196/jmpm.v8i2.25689

Abstract

Distribution pipes play an important role in the oil and gas industry, allowing fluids such as crude oil, natural gas, and processed products to move. X Company, an oil and gas company, uses these pipelines to transport diesel fuel from the refinery unit to storage tanks. Proper inspection and maintenance of this pipeline is critical to avoiding issues such as corrosion, cracking, and material failure, which can jeopardize safety, finances, the environment, social stability, legal compliance, and business continuity. This study evaluates a risk-based inspection methodology for ten thickness measurement locations on diesel fuel distribution pipelines using the API 581 standard. The procedure includes a literature review, data collection, assessment of remaining life, calculation of the probability and consequence of failure, risk profiling, and the development of an inspection plan. The results indicate that the pipelines have an average remaining life of 13.14 years. Nine thickness measurement locations were classified as 1C and one as 2C, placing them in the medium-risk category. Every three years, a re-inspection plan is proposed that includes both a 100% visual inspection and targeted non-destructive testing using ultrasonic thickness readings. This study demonstrates how risk-based inspection concepts can be used in practice to improve pipeline integrity inspection procedures. The findings include practical recommendations for increasing safety and operational reliability while reducing inspection costs and risks associated with diesel fuel distribution pipelines.
The Effect of Roof Slope and Orientation on the Performance of On-Grid PV Plants in Central Java, Indonesia Umam, Mukhamad Faeshol; Patria, Mochamad Febrian Adhi; Fitri, Sanira; Cantika, Mauria; Pramudya, Wulan Regina; Farras, Hani Aulia
Journal of Renewable Energy and Mechanics Vol. 9 No. 01 (2026): REM VOL 9 No 01 2026
Publisher : UIR PRESS

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Abstract

This study presents a comprehensive five-year performance analysis of four 20 kWp grid-connected rooftop photovoltaic plants in Central Java, Indonesia, to evaluate the impact of roof slope and orientation. The research identifies an optimal configuration of 20° tilt with a Northeast (45°) orientation, which yielded a peak DC power of 15.2 kW and demonstrated the highest initial and long-term energy production. However, this investigation reveals that one system with a near-optimal geometry suffered a failure, reducing its output by over 70% due to a single-array fault, while a suboptimal dual-orientation system maintained higher production through consistent operation. The data conclusively shows that performance degradation and component failure can outweigh the advantages of an optimal roof design. The study concludes that the economic viability of rooftop PV in Central Java is contingent upon a dual strategy: prioritizing optimal roof geometry for maximum energy potential, and implementing a proactive operations and maintenance regime to protect the investment. These findings provide an evidence-based guidance for stakeholders to optimize both the design and lifetime performance of solar energy systems.
Co-Authors Affandi , Dani Maulana Cantika, Mauria Farras, Hani Aulia Fitri, Sanira Krisdiyanto Kurniawan, Hanifah Dwi Mukhamad Faeshol Umam Nugraha, Deva Harry Pramudya, Wulan Regina Ramadani, Havid Pandu