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Abstrak :
Kendaraan mesin pembakaran dalam di Indonesia masih menggunakan baterai lead-acid sebagai sumber penyimpanan listrik (akumulator), baik sebagai unit starter, maupun untuk memenuhi kebutuhan listrik pada instrument kendaraan. Akan tetapi baterai lead acid memiliki kelemahan yaitu mengandung material yang sangat toksik yaitu lead (timbal), juga pendeknya usia pakai yang berkisar 1-2 tahun penggunaan. Salah satu alternatif yang dapat ditawarkan adalah dengan konversi akumulator kendaraan mesin pembakaran dalam dengan baterai LiFePO₄ yang memberikan keuntungan usia pakai yang dapat mencapai 8 tahun, tidak memerlukan perawatan, dan juga lebih ramah lingkungan karena dapat didaur ulang. Rangkaian baterai dirancang dengan susunan 4S8P untuk mendapatkan kapasitas nominal 48 Ah. Sel baterai LiFePO₄ diujikan profil tegangan terhadap kapasitas dan stabilitasnya melalui metode HPCC, serta pengujian dan analisis performa pengisian dan pengosongan melalui metode pengujian constant current. Rangkaian baterai 4S8P dilakukan pengujian pemutusan, pengujian stabilitas dan tahanan melalui metode HPPC, serta dianalisis profil pengisian dan pengosongan susunan rangkaian baterai 4S8P pada suhu ruang dan 60°C untuk mewakili kondisi pada ruang mesin. Hasil yang didaptkan baterai masih bekerja pada suhu 60°C dan hal ini bisa dijadikan rujukan baterai LiFePO₄ bisa digunakan sebagai akumulator pada kendaraan mesin pembakaran dalam. ......Internal combustion engine vehicles in Indonesia use lead-acid batteries as a source of electricity storage (accumulator), either as a starter unit or to supply the electricity demand from vehicle instruments. However, lead acid batteries have the disadvantage which is contain toxic material, lead, and it has a short service life for around 1-2 years. One of alternatives that can be offered is the conversion of internal combustion engine vehicle accumulators to LiFePO₄ batteries, which provides the advantage of a service life up to 8 years, it does not require maintenance, and it is more environmentally friendly due to able to be recycled. The battery series is designed with a 4S8P circuit arrangement to obtain a nominal capacity of 48 Ah. LiFePO₄ battery cells are tested for voltage profiles for stability using the HPCC method, and it tested and analyzed the charging and discharging performance using the constant current testing method. Then The 4S8P battery circuit was subjected to be tested for stability and resistance testing using the HPPC method, and the charging and discharging profile of the 4S8P battery circuit was analyzed at room temperature and 60°C to represent conditions in the engine room. The results obtained that the battery can be performed at 60°C thus it can be concluded as reference that LiFePO₄ batteries can be used as accumulators in internal combustion engine vehicles.

Abstrak :
Energi listrik menjadi energi yang paling sering digunakan karena proses pembangkitannya yang mudah, dapat dikonversi menjadi bentuk energi lain serta dapat dengan mudah disimpan. Salah satu metode penyimpanan energi listrik yang paling terkenal saat ini adalah baterai. Baterai memiliki keunikan selain dapat menyimpan energi, baterai juga dapat menghasilkan energi melalui proses kimia di dalamnya. Dalam pemilihan baterai ada beberapa faktor yang perlu disesuaikan dengan spesifikasi desain yaitu harga, usia, berat, volume, temperatur, sensitivitas dan akses pemeliharaan. Ada 2 tipe baterai yang biasa digunakan yaitu lithium ion dan lead acid. lithium ion memiliki spesifikasi lebih baik dari pada lead acid, namun dengan biaya yang lebih mahal. Lead acid cocok digunakan untuk aplikasi permanen on site dan aplikasi yang tidak mementingkan effiensi. Baterai memerlukan sistem kontrol supaya mampu bekerja dengan baik dan handal yang disebut (Battery Management System) BMS. Salah satu aspek BMS adalah pemantauan (State of Charge) SOC. Salah satu metode estimasi SOC adalah internal resistance. Penelitian dimulai dengan mengidentifikasi faktor yang mempengaruhi State of Charge, membuat desain rangkaian, simulasi rangkaian. realisasi printed circuit board hasil simulasi, pengukuran tegangan dan arus dan validasi hasil pengukuran dengan membandingkannya dengan hasil pengukuran dari modul NI 9206......Electrical energy is the energy that is most often used because the generation process is easy, can be converted into other energy and can be stored easily. One of the most popular methods of storing electrical energy today is the battery. Batteries are unique in addition to being able to store energy, batteries can also produce energy through chemical processes in them. In selecting a battery there are several factors that need to be adjusted to the design specifications, namely price, age, weight, volume, temperature, sensitivity and access to maintenance. There are 2 types of batteries commonly used, namely lithium ion and lead acid. lithium ion has better specifications than lead acid, but at a higher cost. Lead acid is suitable for permanent on-site and non-efficiency applications. Batteries require a control system to be able to work properly and reliably called (Battery Management System) BMS. One aspect of BMS is (State of Charge) SOC Supervision. One method of estimating SOC is internal resistance. The research begins by identifying the factors that affect the State of Charge, making circuit designs, circuit simulations. realization of printed circuit board simulation results, measurement of voltage and current and validation of measurement results by comparing them with measurement results from INI 9206 module.

Abstrak :
Motor sinkron magnet permanen yang digunakan pada tesis ini adalah motor sinkron magnet permanen tiga fasa. Sumber tegangan yang digunakan yaitu leadacid battery dengan menserikan 67 baterai karena tegangan yang dibutuhkan adalah 400 volt dan setiap cell memiliki tegangan sebesar 6 volt. Sistem kendali untuk motor sinkron magnet permanen yang diterapkan pada tesis ini adalah pengendali arus menggunakan PI, dibantu dengan dekopling, kemudian pengendali kecepatan menggunakan IP. Proses selanjutnya setelah mengetahui sistem kendali yang digunakan adalah menurunkan rumus seluruh sistem dan kemudian melakukan tahap liniearisasi agar dapat dibentuk dalam ruang keadaan sehingga dapat mengetahui kestabilan sistem. Kestabilan sistem diketahui dengan merubah SoC (State of Charge) , Torsi beban, dan atau atau kecepatan. Dari pengujian tersebut dihasilkan bahwa torsi beban tidak memengaruhi kestabilan sistem, namun, ketika SoC = 100% nilai salah satu pole adalah -0.001375 dan ketika SoC = 20% pole menjadi -0.002081. Perubahan kecepatan dari 1000 rpm menjadi 500 rpm mengakibatkan salah satu pasang pole kembar −0.02±0.09i menjadi −1.28±2.62i , dua pasang pole kembar −1.28±2.62i dan −100.42±418.98i menjadi −0.07±0.17i dan −100.36±209.61i ......The permanent magnet synchronous motor used in this thesis is a three phase permanent magnet synchronous motor. The voltage source used is a lead-acid battery with 67 batteries because the required voltage is 400 volts and each cell has a voltage of 6 volts. The control system for the permanent magnet synchronous motor applied in this thesis is a current controller using PI, assisted by decoupling, then speed control using IP. The next process after knowing the control system used is to derive the formula for the entire system and then perform a linearization stage so that it can be formed in the state space so that it can determine the stability of the system. System stability is known by changing the SoC (State of Charge), load torque, and/or speed. From this test, it is found that the load torque does not affect the stability of the system, but when SoC = 100% one of poles has value -0.001375, when SoC = 20%, the pole has value - 0.002081, and the changing of speed from 1000 rpm to 500 rpm affect one pair of twin poles is −0.02±0.09i to −1.28±2.62i , two pairs of twin poles are −1.28±2.62i and −100.42±418.98i to −0.07±0.17i and −100.36±209.61i

Abstrak :
Karena masalah pemanasan global, upaya sedang dilakukan untuk membuat dan mengembangkan pembangkit energi baru dan terbarukan. Namun, energi energi terbarukan memiliki permasalahan karena ketergantungan pada alam yang tidak teratur. Oleh karena itu, pembuatan genset lebih mahal, karena perlu manipulasi keluaran listrik agar stabil dan dapat disambungkan ke jaringan. Salah satu cara untuk menstabilkan keluaran listrik adalah dengan menggunakan baterai. Salah satu jenis baterai yang digunakan adalah timbal-asam baterai. Baterai ini merupakan jenis baterai yang sering digunakan karena harga pembuatannya yang murah. Jika dibandingkan dengan baterai lithium-ion, baterai timbal-asam ternyata lebih sensitif terhadap suhu dan faktor lainnya. Ditemukan bahwa baterai timbal-asam lebih mahal untuk dirawat dan memiliki umur yang lebih pendek. Penelitian ini diharapkan dapat membantu bisnis memecahkan masalah suhu dingin di negara-negara yang mengalami musim dingin. Dalam penelitian ini ditemukan bahwa baterai 9 Ah memiliki kapasitas yang 27% lebih rendah pada suhu lingkungan -100 C dibandingkan dengan baterai pada suhu lingkungan 500 C. Ditemukan juga bahwa baterai 5 Ah memiliki kapasitas 271,2% lebih sedikit saat memiliki arus discharge 6 Ampere dibandingkan saat baterai memiliki arus discharge 1,2 Amper. ......Due to the problem of global warming, efforts are being made to make and developing new and renewable energy plants. However, energy renewable energy has problems due to dependence on nature which does not regular. Therefore, the manufacture of the generator is more expensive, because the need for manipulation of the electrical output to be stable and can be connected to the grid. One way to stabilize the electrical output is to use battery. One type of battery used is lead-acid battery. This battery is the type of battery that is often used because it is cheap manufacturing price. When compared to lithium-ion batteries, batteries lead-acid was found to be more sensitive to temperature and other factors. It was found that lead-acid batteries are more expensive to maintain and have shorter lifespan. This research is expected to help businesses solve the problem of cold temperatures in countries that experience monsoons cold. In this study it was found that the 9 Ah battery has a capacity of which is 27% lower when at -100 C ambient temperature compared to with when the battery is in an ambient temperature of 500 C. It was also found that 5 Ah battery has 271.2% less capacity when it has current discharge 6 Ampere compared to when the battery has a discharge current 1.2 Ampere

Abstrak :
Baterai lead-acid merupakan salah satu penyimpanan energi listrik untuk energi terbarukan. Harga baterai yang relatif murah, efisiensi listrik yang baik sekitar 70%, dapat bekerja dengan baik pada suhu rendah dan tinggi, serta komponen sel yang mudah didaur ulang menyebabkan baterai ini sangat menjanjikan keadaan muatan merupakan salah satu parameter penting dalam baterai. Selain itu, estimasi keadaan muatan juga diperlukan untuk membantu memprediksi siklus pengisian pada baterai sehingga dapat memperlama umur dari baterai lead-acid. Terdapat banyak metode dalam pengestimasian keadaan muatan. Pada studi ini, keadaan muatan pada baterai lead-acid diestimasikan menggunakan metode perhitungan Coulomb dan FFNN. Kedua hasil estimasi tersebut dibandingkan untuk melihat tingkat efisiensi dari masing-masing metode. Hasil studi ini menunjukkan bahwa metode FFNN lebih baik daripada metode perhitungan coulomb dengan selisih nilai kesalahan sebesar 5,56% pada masukkan data percobaan dan 0.46% pada masukkan data simulasi. ......The lead-acid battery is one of the type of renewable energy storage. It cheaps price, good electricity-effisiense around 70%, work well at low and high temperatures, and the cell components are easily recycled cause this battery is very promising for the future. The state of charge is one of the essential parameters in the battery. Besides, an estimated state of charge is also needed to predict the battery charging cycle so that it can improve the lifetime of the lead-acid battery. There are many methods in estimating the state of charge. In this study, the state of charge on lead-acid batteries is estimated using the Coulomb counting and feed-forward neural network method. The two estimation results are compared to see the level of efficiency of each method. The resulst of this study show that the feed-forward neural network method is better than the Coulomb Counting method with a ratio of 5,56% on the first input and 0,46% on the second input.

Abstrak :
Energi listrik merupakan salah satu kebutuhan utama dalam kehidupan modern. Akan tetapi, pertumbuhan penduduk di Indonesia cenderung meningkatkan konsumsi listrik. Sementara itu, ketersediaan energi fosil semakin terbatas. Meskipun potensi energi matahari di Indonesia mencapai 207,8 GWp, pemanfaatan energi surya hanya mencapai peringkat keempat dalam penggunaan energi terbarukan, yakni sebesar 322,6 MW pada tahun 2023. Oleh sebab itu, pengoptimalan penggunaan energi surya melalui sistem pembangkit listrik tenaga surya (PLTS) sangat penting. Gedung Departemen Teknik Elektro Universitas Indonesia dengan konsumsi listrik yang relatif besar dijadikan sebagai lokasi studi. Penelitian mencakup simulasi konfigurasi PLTS Atap On-Grid dan Off-Grid dengan variasi penambahan generator set. PLTS Off-Grid juga disimulasikan dengan jenis Baterai Lead Acid dan Baterai Lithium Ion, dengan biaya komponen masing-masing $235,72/kWh dan $392,87/kWh, serta dengan spesifikasi teknis menurut standar HOMER Pro. Semua konfigurasi dan skema PLTS akan dibandingkan untuk mendapatkan yang paling optimal berdasarkan biaya Net Present Cost (NPC). Hasil simulasi HOMER Pro dan analisis menunjukkan bahwa Baterai Lithium Ion merupakan baterai yang paling optimal untuk PLTS Off-Grid. Penambahan generator set meningkatkan NPC pada sistem On-Grid optimal, tetapi menurunkan NPC pada sistem Off-Grid optimal. PLTS On-Grid akan optimal tanpa penambahan generator set. Sementara, PLTS Off-Grid akan optimal dengan penambahan generator set dan penggunaan Baterai Lithium Ion. Analisis ekonomi dengan parameter Net Present Value (NPV), Internal Rate of Return (IRR), dan Payback Period menunjukkan bahwa PLTS On-Grid tanpa generator set optimal layak untuk diimplementasikan. ......Electricity is one of the primary necessities in modern life. However, Indonesia’s population growth tends to increase electricity consumption. Meanwhile, fossil energy availability is becoming increasingly limited. Despite Indonesia’s solar energy potential reaching 207.8 GWp, solar energy utilization only ranked fourth in renewable energy usage, reaching 322.6 MW in 2023. Therefore, optimizing solar energy utilization through solar photovoltaics plants (PLTS) is crucial. The Department of Electrical Engineering Building at the University of Indonesia, with its relatively high electricity consumption, is chosen as the study site. The research includes simulating On-Grid and Off-Grid Rooftop PLTS configurations with variations in the addition of generator set. Off-Grid PLTS is also simulated with Lead Acid and Lithium Ion Batteries, with component costs $235.72/kWh and $392.87/kWh, respectively, and technical specifications according to HOMER Pro standards. All PLTS configurations and schemes will be compared to obtain the most optimal for one based on the Net Present Cost (NPC). The HOMER Pro simulation results and analysis show that adding generator sets increases the NPC in optimal On-Grid system but decreases it in optimal Off-Grid systems. On-Grid PLTS will be optimal without adding a generator set, while Off-Grid PLTS will be optimal with the addition of a generator set and the use of Lithium Ion Batteries. Economic analysis with Net Present Value (NPV), Internal Rate of Return (IRR), and Payback Period parameters indicates that optimal On-Grid PLTS without a generator set is feasible for implementation.

Abstrak :
Perkembangan teknologi renewable energy dan mobile energy storage menyebabkan peningkatan kebutuhan akan suatu media penyimpan daya dengan kualitas dan kapasitas tinggi. Selain kualitas dari media penyimpan daya, dibutuhkan juga suatu sistem manajemen daya untuk memonitor penggunaan daya baterai. Untuk memonitor penggunaan daya baterai tersebut, diperlukan suatu metoda pembacaan level kapasitas baterai yang akurat dan keandalan tinggi. Hambatan dalam baterai merupakan sebuah sifat resistif dalam baterai yang dapat digunakan untuk menentukan level kapasitas baterai. Dalam penelitian ini akan dibahas tentang korelasi pengukuran hambatan dalam baterai dengan level kapasitas daya tersisa pada baterai, kemudian korelasi antara pengukuran hambatan dalam baterai dengan level kapasitas daya dinyatakan dalam bentuk grafik state of charge vs hambatan dalam baterai, dimana besar nilai hambatan dalam baterai per sel adalah 10 milliOhm ketika SoC 100 dan 330 miliohm ketika SoC 61,5 , grafik korelasi dapat dilihat pada bab 4. Mengacu pada grafik hasil penelitian, ditemukan setiap peningkatan nilai hambatan dalam baterai akan berkorelasi terhadap penurunan level kapasitas daya baterai yang tersisa.

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By the advancement of renewable energies and mobile energy storages, the needs of high quality and high capacity batteries are increasing. Simultaneously, the improvement of battery management systems is inevitable, hence to improve the quality of battery management system, the accuracy of power capacity measurement is required. Battery internal resistance measurement is a new method to measure battery rsquo s power capacity. This thesis will discuss about the correlation of battery internal resistance and the power capacity, also the accuracy of the measurement. The correlation between battery internal resistance and the battery capacity shown in state of charge vs internal resistance line graphic, where the battery rsquo s cell internal resistance measured are 10 milliOhms for SoC 100 and 330 milliOhms for SoC 61,5 , the correlation are shown on the graphic at chapter 4. Based on the experiments, for every increment of battery rsquo s internal resistance correlates with the reduction of Battery rsquo s State of Charge values.

Abstrak :
[ABSTRAK
Penelitian ini dilakukan untuk mengetahui pengaruh sonikasi dengan media air terhadap serbuk timbal sebagai material aktif elektroda positif (PAM) dan hubunganya terhadap kapasitas baterai lead acid. Serbuk timbal yang dipakai merupakan standar pabrik yang di produksi dengan metode ball mill (Shimadzu). Serbuk timbal hasil sonikasi kemudian dianalisa dengan Partikel Size Analizer (PSA), X-ray diffraction ( XRD), GSAS, SEM/EDS dan Gravimetric Free Lead Test. Aglomerasi serbuk timbal terjadi pada awal proses sonikasi. Telah didapat serbuk timbal dengan ukuran nano (92 nm) pada sonikasi 600 menit. Serbuk timbal hasil sonikasi digunakan sebagai elektroda positif yang dipasangkan dengan elektroda negarif dari standar pabrik. Kapasitas mula yang dihasilkan ternyata lebih kecil dari kapasitas standar pabrik hal ini karena hilangnya komponen free lead pada serbuk timbal hasil sonikasi. Semakin kecil free lead yang terkandung dalam serbuk timbal hasil sonikasi dengan media air, PAM secara mekanik tidak stabil, proses formasi sulit dan kapasitas baterai yang dihasilkan semakin kecil. Ditemukan pula bahwa semakin besar ukuran partikel serbuk timbal sebagai bahan material aktif positif maka umur pakai baterai semakin baik.

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ABSTRACT
Our goal in this research was to determine the effect of sonication leady oxide with distilled water as positive active material (PAM) and relation to the lead acid batteries capacity. Industrial product leady oxide (ball mill method) was used as raw material in this research. The prepared leady oxide was characterized and analyzed by particle size analyzer (PSA), X-ray diffraction (XRD), GSAS, SEM/EDS and Gravimetric Free Lead Test. Agglomeration occurs at the beginning of sonication. Been obtained the nanostructure leady oxide with particle size 92 nm at 600 minutes sonication. It?s sonication results are used as positive electrode which coupled with industrial negatives plates. The resulting initial capacity is smaller than Industrial product because loss of free lead components on leady oxide sonication results. The lack of free lead components in leady oxide as a result of water solvent sonication, cause PAM is mechanically unstable and difficult to form, and hence the plates have lower capacity. It was also obtained that larger particle size of leady-oxide , the life cycle of the battery is getting better;Our goal in this research was to determine the effect of sonication leady oxide with distilled water as positive active material (PAM) and relation to the lead acid batteries capacity. Industrial product leady oxide (ball mill method) was used as raw material in this research. The prepared leady oxide was characterized and analyzed by particle size analyzer (PSA), X-ray diffraction (XRD), GSAS, SEM/EDS and Gravimetric Free Lead Test. Agglomeration occurs at the beginning of sonication. Been obtained the nanostructure leady oxide with particle size 92 nm at 600 minutes sonication. It?s sonication results are used as positive electrode which coupled with industrial negatives plates. The resulting initial capacity is smaller than Industrial product because loss of free lead components on leady oxide sonication results. The lack of free lead components in leady oxide as a result of water solvent sonication, cause PAM is mechanically unstable and difficult to form, and hence the plates have lower capacity. It was also obtained that larger particle size of leady-oxide , the life cycle of the battery is getting better;Our goal in this research was to determine the effect of sonication leady oxide with distilled water as positive active material (PAM) and relation to the lead acid batteries capacity. Industrial product leady oxide (ball mill method) was used as raw material in this research. The prepared leady oxide was characterized and analyzed by particle size analyzer (PSA), X-ray diffraction (XRD), GSAS, SEM/EDS and Gravimetric Free Lead Test. Agglomeration occurs at the beginning of sonication. Been obtained the nanostructure leady oxide with particle size 92 nm at 600 minutes sonication. It’s sonication results are used as positive electrode which coupled with industrial negatives plates. The resulting initial capacity is smaller than Industrial product because loss of free lead components on leady oxide sonication results. The lack of free lead components in leady oxide as a result of water solvent sonication, cause PAM is mechanically unstable and difficult to form, and hence the plates have lower capacity. It was also obtained that larger particle size of leady-oxide , the life cycle of the battery is getting better;Our goal in this research was to determine the effect of sonication leady oxide with distilled water as positive active material (PAM) and relation to the lead acid batteries capacity. Industrial product leady oxide (ball mill method) was used as raw material in this research. The prepared leady oxide was characterized and analyzed by particle size analyzer (PSA), X-ray diffraction (XRD), GSAS, SEM/EDS and Gravimetric Free Lead Test. Agglomeration occurs at the beginning of sonication. Been obtained the nanostructure leady oxide with particle size 92 nm at 600 minutes sonication. It’s sonication results are used as positive electrode which coupled with industrial negatives plates. The resulting initial capacity is smaller than Industrial product because loss of free lead components on leady oxide sonication results. The lack of free lead components in leady oxide as a result of water solvent sonication, cause PAM is mechanically unstable and difficult to form, and hence the plates have lower capacity. It was also obtained that larger particle size of leady-oxide , the life cycle of the battery is getting better, Our goal in this research was to determine the effect of sonication leady oxide with distilled water as positive active material (PAM) and relation to the lead acid batteries capacity. Industrial product leady oxide (ball mill method) was used as raw material in this research. The prepared leady oxide was characterized and analyzed by particle size analyzer (PSA), X-ray diffraction (XRD), GSAS, SEM/EDS and Gravimetric Free Lead Test. Agglomeration occurs at the beginning of sonication. Been obtained the nanostructure leady oxide with particle size 92 nm at 600 minutes sonication. It’s sonication results are used as positive electrode which coupled with industrial negatives plates. The resulting initial capacity is smaller than Industrial product because loss of free lead components on leady oxide sonication results. The lack of free lead components in leady oxide as a result of water solvent sonication, cause PAM is mechanically unstable and difficult to form, and hence the plates have lower capacity. It was also obtained that larger particle size of leady-oxide , the life cycle of the battery is getting better]

Abstrak :
ABSTRAK
Inkubator bayi adalah alat elektromedik yang berfungsi untuk memberikan kehangatan, kelembaban, dan oksigen dimana seluruh lingkungannya terkontrol dan diperlukan oleh bayi prematur. Supaya inkubator bayi berfungsi dengan benar, dibutuhkan pasokan listrik yang cukup supaya tercapai berat badan bayi yang ideal. Untuk beberapa desa-desa di Indonesia yang tidak terjangkau oleh sumber listrik konvensional atau listrik PLN akan menjadi bahaya untuk bayi prematur. Sehingga dikembangkan sistem catu daya inkubator bayi dengan sumber energi terbarukan berbasis arus searah. Beberapa keuntungan sumber listrik arus searah adalah efisisensi yang tinggi dimana transmisi arus searah bisa membawa daya lebih banyak dengan rugi-rugi listrik dalam jumlah yang kecil serta kehandalan yang tinggi. Penelitian ini membahas tentang tiga skenario studi sistem catu daya inkubator bayi. Hasil dari penelitian yang dilakukan pada skenario pertama untuk durasi ketahanan suplai baterai asam timbal untuk daya lampu 42 W mampu bertahan selama 504 menit dan untuk daya lampu 31 W mampu bertahan selama 721 menit. Pada skenario kedua untuk durasi ketahanan suplai baterai lithium-ion untuk daya lampu 42 W mampu bertahan selama 755 menit dan untuk daya lampu 31 W mampu bertahan selama 990 menit. Untuk skenario ketiga pada ketahanan suplai baterai lithium-ion untuk daya lampu 50 W mampu bertahan selama 625 menit.

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ABSTRACT
Baby incubator is an electromedical device that give a warm, humidity, and oxygen where it rsquo s environment controlled and required by premature baby. For the proper usage on this device, it requires an enough supply of electric to reach an ideal weight for babies. It rsquo s a difficulty for some villages in Indonesia that are not covered by a conventional electricity. Then, developed a power supply system for baby incubator with renewable energy based on Direct Current. Several advantages of direct current usage are high efficiency, which it rsquo s transmission can carry more power with a small amount of electrical losses and high reliability. This research discusses about three scenarios of electrical system for baby incubator. The result of this research is for the first scenario using a lead acid battery on 42 W lamp can last for 504 minutes and on 31 W lamp can last for 721 minutes. At the second scenario using lithium ion battery on 42 W lamp can last for 755 minutes and on 31 W lamp can last for 990 minutes. And for the third scenario using lithium ion battery on 50 W lamp can last for 625 minutes.