Design of Photovoltaic as Energy Source at Government Office in Pangkalpinang

DOI:10.31629/jit.v2i2.3731 Abstract In the regulation of the general energy plan for the Bangka Belitung region, it is targeted that the total use of new and renewable energy will reach 17.21% in 2025 and 30.97% in 2050. This, of course, requires a measurable implementation to achieve this. In this regard, a photovoltaic design was carried out as a source of electrical energy in one of the government offices in Pangkalpinang. This office's daily demand for electrical energy is 78.79 kWh, with an average solar irradiance of 487.51 W/m2 and a measured ambient temperature of 26 – 33.3 C. The modeling is carried out using three types of photovoltaic panels, a namely polycrystalline, monocrystalline and thin film with a supply power is combined with a source from PLN and 100% photovoltaic


Introduction
Pangkalpinang is the capital of the Bangka Belitung Islands Province, with a population of 212.700 people in 2019, equal to 14.29% of the total population of the Bangka Belitung Islands Province [1]. To meet the electrical energy needs in Pangkalpinang itself, in 2020, PLN Bangka Belitung produces 480671.609 GWh from several types of existing power plants, including steam gas power plants and diesel power plants.
In addition to the use of fossil-based energy, several new renewable energy sources have also been developed, both owned by PLN Bangka Belitung or private. Including 1.41% sourced from biomass energy, 1.66% sourced from biogas, 1.77% sourced from vegetable CPO = 1.77% and 0.05% sourced from solar energy [2].
The development of new and renewable energy is in line with the Regional General Energy Plan of the Bangka Belitung Islands Province policy, which targets that in 2025, the new renewable energy mix will reach 17.21%, and in 2050 it will reach 30.97% [3]. The target set has a chance to be achieved because it has become a national achievement target, including the State-Owned Utility's 2019-2028 Electricity Supply Business Plan [4] by taking into account various factors in its preparation [5,6].
In this regard, a photovoltaic design will be carried out as a source of electrical energy in the city of Pangkalpinang as a way to increase new energy from the government sector.

Materials and Methods
This research went through several stages to obtain research supporting data, namely: 1. Making a plan of the research site-building 2. Measurement of solar irradiance at the study site using a solar meter as shown in figure 1 3. Measurement of temperature at the research site using a thermometer as shown in figure 2 4. Counting the number of electrical equipment used and their specifications 5. Get the amount of rupiah for electricity bill payments to support the amount of energy used in the last year 6. Design using three types of photovoltaic; polycrystalline, monocrystalline, and thinfilm with several loading scenarios.

Results and Discussions
This research was conducted at the social service office of Pangkalpinang city, one of the organizations that directly serve the community in the Pangkalpinang city government. This office building only consists of 1 (one) floor with an area of 700 m 2 with average monthly electricity consumption of 1666 -2523 kWh. Figure 3 is the result of measuring solar irradiance at the location measured using a solar meter. The measurement results show that the average solar irradiance is 487.51 W/m 2 .  This study has been modeled and carried out with several scenarios so that photovoltaic can be an option as a source of electrical energy in this office. The goal is that the target for the energy mix sourced from new and renewable energy can be increased immediately, with the government sector as an example.
This modeling is carried out in 4 scenarios while still guided by the fulfillment of daily electrical energy in the office. The measured daily electrical load of all existing equipment is 78.79 kWh.

Conclusion
This research focuses on designing photovoltaic as a new renewable energy source in the government sector to support the target of a new renewable energy mix. The daily electrical energy requirement measured at the Pangkalpinang city social service office is 78.79 kWh. The modeling scenario uses four models of combined power supply from PLN and photovoltaic. This design also compares three types of photovoltaic; polycrystalline, monocrystalline, and thin-film types.