Indonesian Journal of Electrical Engineering and Renewable Energy (IJEERE)

Effect of Raw Material Variations on the C/N Ratio of Biogas Potential Mixtures of Chicken Manure and Water Hyacinth

Sahrur Ramadan — 2025-06-16

This study aims to determine the optimal C/N (carbon/nitrogen) ratio of a mixture of chicken manure and water hyacinth in the anaerobic fermentation process, as well as to evaluate the potential for biogas and electricity production with and without the use of a starter. In this experiment, a mixture of 300 kg of chicken manure and 200 kg of water hyacinth, with an additional 75 kg of starter, was used to achieve a more ideal C/N ratio. The fermentation process was carried out in two scenarios: one with a starter and one without a starter, to compare the results. The analysis results show that the use of a starter significantly increased the volume of biogas produced, which was 89.06 m³, compared to 70 m³ produced without a starter. In addition, the potential for electricity generation also increased significantly, from 329 kWh without a starter to 418 kWh with a starter. The biogas production increased by 27.23% with the use of a starter. These findings suggest that the use of a starter not only increases the volume of biogas but also improves energy conversion efficiency, making it an effective method to enhance anaerobic fermentation outcomes and achieve a more ideal C/N ratio, which in turn can optimize renewable energy production from organic materials.

Analysis Of The Potential Of Fecal Waste As An Alternative Fuel

Aldi pratama — 2025-06-27

Human feces is an abundant organic waste that poses environmental risks if not managed properly. One sustainable solution is to convert it into renewable energy in the form of biogas. This study aims to analyze the potential of utilizing human feces as an alternative fuel source at the Jabal Nur Islamic Boarding School in Kandis, Riau, Indonesia. A quantitative approach was used, incorporating both primary and secondary data. The results indicate that with 820 students, the boarding school produces approximately 328 kg of feces per month, which can generate around 60.5 m³ of biogas. This biogas can reduce LPG consumption by 27.48 kg per month. The economic feasibility analysis reveals that while the project is environmentally viable, it is not yet financially profitable, with a Net Present Value (NPV) of -Rp1,174,700, a Net Benefit-Cost Ratio (Net B/C) of 0.856, and a Payback Period (PBP) of 7.18 years. Nevertheless, human feces-derived biogas holds significant potential as an environmentally friendly and sustainable alternative energy solution.

Utilization Of Stirling Engines As An Alternative Energy Source For Small-Scale Power Supply Systems

Muhammad Rizky — 2025-06-27

Limited access to electricity in remote areas is a serious challenge in national energy distribution. This study aims to examine the use of Stirling engines as an environmentally friendly alternative energy source that can be used for small-scale power supply systems. Stirling engines were chosen because of their ability to convert heat energy from various sources into mechanical energy, which is then converted into electrical energy. The research methods include prototype design, performance testing, and interviews with experts in the field of energy conversion. The test results show that Stirling engines are capable of producing an average electrical power of 5.7 watts at an operating temperature of ? 300°C, with an energy conversion efficiency of around 15–20%. The integration of a microcontroller-based power control system has succeeded in increasing output stability and facilitating system performance monitoring. The interview results support that this technology has the potential to be further developed in areas that have not been reached by electricity. This study concludes that Stirling engines are an alternative solution that is applicable, economical, and supports the development of renewable energy in Indonesia.

Analyzing The Role of Micro Hydro in Overcoming the Electricity Supply Crisis

Fauzan Afif — 2025-06-27

The electricity supply crisis is still a major problem in various remote areas in Indonesia, which has a negative impact on economic growth, education, and community welfare. To overcome this problem, the use of renewable energy such as Microhydro Power Plants (PLTMH) is one of the relevant and sustainable solutions. This study aims to analyze the role of microhydro in overcoming the electricity supply crisis, as well as identifying supporting and inhibiting factors in its implementation. The research method used is a qualitative-descriptive approach with data collection techniques through literature studies, interviews, and field observations in areas that have developed PLTMH. The results of the study show that microhydro is able to make a significant contribution to the provision of electricity independently in areas that have not been reached by the PLN network. In addition, active community involvement in the management and maintenance of PLTMH is a key factor in the success of this program. However, challenges such as limited funds, lack of technical support, and operational sustainability issues are still major obstacles. Therefore, synergy between the government, community, and private sector is needed to encourage the development of microhydro as a long-term solution to overcome the electricity supply crisis in remote areas.

Analysis of Off Grid Solar Panel System Design on Floor 3 Lighting at Al-Azhar University Medan

Muhammad Teguh teguh dane — 2025-06-27

This study discusses the analysis and design of an off-grid solar panel system to support lighting needs on the 3rd floor of a university consisting of 6 rooms with a size of 9×7 meters each. The purpose of the study is to produce a design for an independent photovoltaic system that is able to meet lighting energy needs optimally. The methodology used includes measuring electrical loads, analyzing power requirements, calculating the capacity of main components, and economic analysis. The results of the study indicate that to meet the power needs of 3.22 kWh per day, a solar panel with a total capacity of 2.1 kWp, a 400 Ah/48V battery, and a 1.5 kW inverter are needed. The economic feasibility analysis of the system shows a Return on Investment (ROI) value of 5.8 years with a system life of up to 25 years. This study makes a significant contribution to efforts to implement renewable energy and reduce dependence on conventional electricity networks in higher education environments.

Analysis Of Rooftop Photovoltaic (PV) System Effectiveness for Building Electricity Bill Reduction

Edo Prasetio — 2025-06-29

The rising cost of electricity due to the dependence on fossil fuels has become a significant burden for households in Indonesia. Rooftop Solar Power Systems (PLTS Atap) emerge as a potential clean energy solution to address this problem. This study aims to analyze the effectiveness and economic feasibility of implementing Rooftop Solar as an effort to reduce household electricity bills. This study applies a mixed-method (quantitative-qualitative) approach through surveys and interviews with 25 households with 1300 VA or higher electricity service. The quantitative analysis results show that for an average monthly consumption of 329.1 kWh, a 3 kWp solar power system is highly recommended. This system has the potential to cut monthly bills by up to 95.7% with a payback period of approximately 8.5 years, although it requires an initial investment of around IDR 46,250,000. However, the qualitative findings reveal that the majority of respondents (56%) are hesitant due to this initial investment cost. Meanwhile, another 20% of respondents were neutral, indicating a need for more information and accessible financing schemes. This study concludes that although Rooftop Solar is highly feasible from a technical and economic standpoint, its main barriers are socio-economic. The success of future adoption heavily depends on the availability of accessible financing models to overcome the initial capital challenge.