International Journal of Recent Technology and Engineering (IJRTE) ISSN: 2277-3878, Volume-8 Issue-4, November 2019 6240 Published By: Blue Eyes Intelligence Engineering & Sciences Publication Retrieval Number: D5147118419/2019©BEIESP DOI:10.35940/ijrte.D5147.118419 Abstract: There are various types of Renewable Energy (RE) that has been studied by many researchers in order to find a cost- effective energy generation in reducing the non-renewable energy source. In this study, the solar energy was suggested in order to apply the Net Energy Metering (NEM) scheme that has been introduced effective on 1st January 2019, by Malaysian government in achieving 20% national RE target in electricity power mix, reducing the dependency on imported fossil fuels. Based on the data and results, the suitable size of solar panel for a house can be determined based on the daily electricity usage. The findings show that the system size and the cost itself also depends on the estimated amount solar generated set by the consumer. Keywords: Grid Connected, Net Energy Metering, Photovoltaic and Renewable energy I. INTRODUCTION Nowadays, electricity consumption for a household is increasing throughout the year. Renewable energy system for residential is a system which consumer can generate electricity at their house. There are many forms of renewable energy for example, solar, wind power, hydroelectric, biomass, geothermal and other forms of energy [1,2,3]. By using a renewable energy, it can help to achieve national RE target in reducing the dependency on imported fossil fuels [4]. One of a common type of renewable energy used for residential is solar photovoltaic (PV) system. The common type of solar system used for residential is Grid Connected Photovoltaic (GCPV) system. It is designed to operate in parallel and interconnected with the electric utility grid. The primary component in GCPV system is the inverter. The inverter converts the Direct Current (DC) power produced by the PV array into Alternating Current (AC) power consistent with the voltage and power quality requirements of the utility grid and automatically stops supplying power to the grid when the utility grid is not energized. When the electrical loads are greater than the PV system output, the balance of power required by the loads is received from the electric utility. Revised Manuscript Received on November 19, 2019. Farah Zaheeda Kamarudin,College of Engineering, Universiti Tenaga Nasional, Jalan IKRAM-UNITEN, 43000 Kajang, Selangor, Malaysia Khairul Salleh Mohamed Sahari, College of Engineering, Universiti Tenaga Nasional, Jalan IKRAM-UNITEN, 43000 Kajang, Selangor, Malaysia Nora Yusma Mohamed Yusop, College of Energy Economics & Social Sciences, Universiti Tenaga Nasional, Jalan IKRAM-UNITEN, 43000 Kajang, Selangor, Malaysia The utility meter will measure the electricity draw or exported to the grid [5]. The grid will provide electricity demand by the load when the system fails or no power generated by PV array [6,7]. At night, electricity will be fully supplied by the conventional grid. The schematic diagram of Grid GCPV system is shown in Figure 1. Fig. 1 Grid Connected Photovoltaic (GCPV) system Net Energy Metering (NEM) is a concept where the energy produced installed by the solar PV system are being consumed first and the remaining excess will be exported to TNB on a one to one offset basis while Malaysia’s Feed in Tariff (FiT) is a system that obliges Distribution Licensees (DLs) to buy from Feed-in Approval Holders (FIAHs) the electricity produced from renewable resources and sets the FiT rate [8]. The significant difference between NEM and FiT is that NEM uses the energy and export the energy back to the grid [9] while FiT by the obligation of DLs will pay for renewable energy supplied to the electricity grid for a specific duration and rate [10]. The NEM scheme also improved the FiT scheme by improving the return of investment of solar PV. II. METHODOLOGY The amount of electricity a solar panel can produce depends on three main reasons which is the size of the solar panel, the efficiency of the solar cells inside and the amount of sunlight the panel received. The data regarding the electricity bill and usage is collected to estimate the size of solar panel. Meanwhile, the data regarding the weather, rainfall, humidity and cloudy is required to see the meteorology pattern in Selangor, Malaysia. A Simplified Method: System Size and Cost Estimation of Grid Connected Photovoltaic (GCPV) System Farah Zaheeda Kamarudin, Khairul Salleh Mohamed Sahari, Nora Yusma Mohamed Yusop