Indonesia is a tropical area that has a very large amount of sunlight which is a potential renewable energy with an average daily irradiation of 4.5-4.8 kWh / m2. As a renewable energy, sunlight is not pollutant, will not run out, but is free or free. Therefore this energy source can be utilized for electricity through the Solar Power Plant (PLTS) system. This research will discuss the design of On Grid Solar Power Generation (PLTS) systems by generating 60% of the load capacity in the Learning Farm area. The power generated is 68.17 kWp using 100 solar cell modules. This PLTS is designed to reduce electricity consumption from PLN in Ancol Ecopark. This location is considered to have good solar radiation potential and a large availability of land. The results of this design are expected to be a reference for the Ancol ecopark learning farm in order to obtain a good match between energy needs, price, and quality.

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The optical transmission of commerical Si wafers was measured at the wavelength of 10.6 μm as a function of temperature in the interval from about 78 to 850 K. We show that the absorptivity of Si increases with the sample temperature. This temperature dependence is explained by free-carrier absorption. A transmission measurement at 10.6 μm wavelength has been used to monitor the temperature of a Si sample as a function of time during cw laser heating.

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