<![CDATA[Abstrak - Hidrogen merupakan sumber energi alternatif yang ramah lingkungan dan berpotensi menggantikan bahan bakar fosil. Penelitian ini bertujuan merancang dan membangun reaktor hidrogen berbasis elektrolisis air dengan memanfaatkan panel surya monocrystalline sebagai sumber energi terbarukan. Sistem terdiri dari panel surya 50 Wp, sensor arus ACS712, sensor gas MQ-8, rangkaian pembagi tegangan, Arduino Uno, dan LCD sebagai media monitoring. Parameter yang diamati meliputi tegangan, arus, daya, dan konsentrasi gas hidrogen. Hasil pengujian menunjukkan tegangan keluaran panel berkisar 3,1–7,2 V dengan arus 1,0–2,7 A. Daya maksimum yang dihasilkan mencapai 32,11 W pada intensitas matahari optimum. Konsentrasi hidrogen meningkat dari 120 ppm menjadi 197 ppm seiring kenaikan arus listrik. Hubungan arus dan produksi hidrogen bersifat linier sesuai Hukum Faraday, di mana jumlah gas berbanding lurus dengan arus. Efisiensi sistem dipengaruhi oleh intensitas radiasi matahari dan resistansi rangkaian elektrolisis. Kata kunci : Monokristal; Elektrolisis Air; Hidrogen; Arus Listrik; Efisiensi; Abstract - Hydrogen is an alternative energy source that is environmentally friendly and has strong potential to replace fossil fuels. This study aims to design and develop a hydrogen reactor based on water electrolysis powered by a monocrystalline solar panel as a renewable energy source. The system consists of a 50 Wp solar panel, ACS712 current sensor, MQ-8 gas sensor, voltage divider circuit, Arduino Uno, and an LCD for monitoring. The observed parameters include voltage, current, power output, and hydrogen gas concentration. Experimental results show that the panel output voltage ranges from 3.1 to 7.2 V with a current of 1.0–2.7 A. The maximum power achieved was 32.11 W under optimal solar intensity. Hydrogen concentration increased from 120 ppm to 197 ppm as the current increased. The relationship between current and hydrogen production is linear in accordance with Faraday’s Law. System efficiency is influenced by solar radiation intensity and electrolysis circuit resistance.. Keywords: Monocrystalline; Water Electrolysis; Hydrogen; Electric Current; Efficiency;]]>
