Abstract:
This study presents the calculation and design of solar cell systems for off grid solar power system connections. The objective is to design a solar cell system and calculate the appropriate basic load size for the solar cell system. To do this, solar energy would be applied with an off grid solar cell system within Nakhon Pathom Technical College. This research compiled the calculation results and examined the working electrical power, current, illumination, and solar cell systems used to fit the workspace. The calculation and testing results demonstrated that it was possible to determine the sizes of solar cell panels, batteries, and lighting loads suitable for the workspace. An analysis of the energy produced from an off-grid solar power generation system is an electricity generation system applied in remote areas, such as rural areas, where there is no system of electricity transmission lines. The key components of the system include photovoltaic panels connected directly to direct current loads. Another configuration is to connect the electrical voltage generated from the PV panels to a solar charge controller. The resulting voltage can be used by connecting to a direct current load. Meanwhile, the remaining electrical power can be stored in batteries and converted using an inverter to change direct current to alternating current for use with alternating current electrical loads. The results of the study and calculation showed that the system load was 3,128.62 watts; however, the fan load and air conditioner load were used alternately. Therefore, a 3,000 watt inverter, 1,360 watt solar panels, and two 100Ah batteries were designed. The results of the calculation and design of the solar cell system for connecting an off grid solar energy system showed that it could partially reduce electricity consumption at Nakhon Pathom Technical College. Future research will analyze the economic aspects of the off grid solar power generation system to demonstrate its potential for cost-effectiveness and long-term savings.