Utilizing Quadcopter were still many obstacles such as; plane easy to fall; the battery is not durable; vulnerable to weather conditions and others. The research and development has grown to improve aircraft facilities and capabilities. Many parameters related to aircraft lift capability factors; fly long; flying high; type of motor; the type of propeller: including the sensors and control systems used. This study was to find the relationship between changes in the BLDC motor voltage source to the rotor angle velocity <em>(ω)</em>; rotor speed to rotor lift <em>(Ft)</em>;  wind speed to rotor lift; push the following rotor <em>(Ct)</em>. Empirical testing was conducted in the laboratory to find the relationship of these parameters. The results data show that; the lift power generated with rotational speed was not proportional, non linearity occurs when the rotor was released from the self and starts pulling the strain gauge when the rotation speed reaches around 65 <em>rps</em>. Once the rotation speed of the rotor is able to reach up to 1.5 Newton lift then the thrust rising trend sharply<strong> </strong>increasing <strong>to</strong>increasing <strong>of </strong>the rotor speed. A motor hade 1200 <em>KV</em> and blade with a radius of 0.12 <em>m</em>, then obtained thrust <em>(Ct)</em> of 1.732.

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Most of the street lightings condition in the area has not use electrical measuring instrument yet, so electricity bill calculated for every lamp, although those lamps are dead or malfunctions. Saving energy consumption on street lighting is not only helping government on energy management but also reducing local government budget for the street lighting electricity bill. This paper aims to analyze challenges faced on street lighting management in order to reduce energy consumption with a case study on Padang Pariaman Regency. This study has been done on data especially electricity bills and also the conditions of street lighting based on field observation held in 2015. The main problem found is unmetered street lighting bill scheme and inappropriate tariff. The solution needed is to install power meter on unmetered street lighting that could reduce unmetered street lighting energy bill. The second solution is replacing conventional lamp technology with new-efficient lamp technology, which one LEDs. From the result of this study, using electrical measuring instrument can save about 542.2 kWh and Rp 795,599.22 monthly for G.10 Tigo Jorong, about 383.4 kWh and Rp 562,555.15 monthly for G.23 Kampung Tangah Koto Hilalang. Compared SON 70 Watt lamp, using LEDs 30 Watt can save about 518.4 kWh or 57.14 %. And for the electricity bill, by using LEDs we can save about Rp. 836,936.52, %. ABSTRAKKondisi PJU sebagian besar daerah belum menggunakan alat pencatat pembatas listrik dimana tagihan rekeningnya dihitung per titik lampu sesuai dengan jenis lampu yang dipasang walaupun lampu tersebut dalam keadaan mati atau tidak berfungsi sama sekali. Penghematan energi pada penerangan jalan umum tidak hanya membantu pemerintah dalam pengelolaan energi namun juga menghemat anggaran pemerintah daerah untuk tagihan listrik PJU. Tulisan ini bertujuan menganalisis permasalahan dalam pengelolaan penerangan jalan umum dalam menghemat pemakaian energi dengan studi kasus di Kabupaten Padang Pariaman. Studi dilakukan dengan data berupa kondisi PJU yang belum dipasang APP berdasarkan data hasil pendataan pada tahun 2015. Permasalahan utama yang ditemukan adalah sistem tagihan PJU dan penggunaan tarif yang tidak sesuai. Solusi yang perlu dilakukan adalah meterisasi PJU yang berpotensi menurunkan tagihan listrik PJU. Solusi kedua adalah penggantian lampu PJU konvensional dengan lampu efisiensi tinggi, dalam hal ini lampu LED. Dari hasil penelitian ini, melakukan pemasangan APP terdapat penghematan sebesar 542.2 kWH dan Rp 795,599.22 tiap bulannya pada gardu G.10 Tigo Jorong, dan dapat dilakukan penghematan sebesar 383.4 kWH dan Rp 562,555.15 tiap bulannya pada gardu G.23 Kampung Tangah Koto Hilalang. Dibandingkan lampu SON 70 Watt, pemakaian lampu LED 30 W lebih hemat sebesar 518,4 kWH per bulan dengan persentase 57.14 %. Sedangkan dari segi tagihan listrik, pemakaian lampu LED terdapat potensi penghematan biaya sebesar Rp. 836,936.52, -atau 54.47 %. Kata kunci: PJU, PJU non meterisasi, penghematan energi PJU.

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The data logger was developed to evaluate potential area of solar panel. Current sensor and voltage sensor were integrated on data logger board to measure parameter that affected toward efficiency of PV system. The obtained Calculation power will be used for assessment and evaluation during collecting data. But, Maximum Power Point Tracking (MPPT) method will provide an efficient data of peak power. The benefit of using data logger is the ability to automatically collecting data on several period. The data can be plotted into V-I graph and P-V graph for analysis. The test bench result was recorded that the maximum power reaches 35W. This data logger with MPPT method can be used as portable recorder to compare the power in different area.