Indonesian Journal of Electrical Engineering and Computer Science Vol. 8, No. 2, November 2017, pp. 391 ~ 398 DOI: 10.11591/ijeecs.v8.i2.pp391-398  391 Received July 22, 2017; Revised September 30, 2017; Accepted October 16, 2017 Performance Analysis of Self-Consumed Solar PV System for A Fully DC Residential House T. M. N. T. Mansur* 1 , N. H. Baharudin 2 , R. Ali 3 1,2,3 School of Electrical System Engineering, Universiti Malaysia Perlis, 02600 Arau, Perlis, Malaysia 1 Centre of Excellence in Renewable Energy (CERE), Universiti Malaysia Perlis, 02600 Arau, Perlis, Malaysia *Corresponding author, e-mail: tunkunizar@unimap.edu.my Abstract Malaysia is moving forward by promoting used of renewable energy such as solar PV to the public where it is generated at the distribution voltage level. The fluctuation of fuel prices becomes main concern to the consumers since it affecting the electricity tariff. The objective of this project is to design a self-consumed DC power system for a residential house from renewable energy resource which is solar PV that it will independent from the utility grid. The methodology proposed are configuring daily load demand, sizing PV array and battery bank and simulation of the design system by using PVsyst. Based on solar energy resource, the optimum PV array size is 2.0 kWp while the battery bank size is 700 Ah at 48 V which is designated for 4 days of autonomy. The system could meet 100% of load demand throughout the year with 67.9% of performance ratio. The loss to the system is contributed by the temperature effect to the PV module, unused energy because of battery full capacity, converter and battery efficiencies. Using this concept, the proposed design set-up is expected to benefit the residential consumers in reducing utility electricity consumption up to 2,434 kWh per year and avoiding 1.7 tons of carbon emissions into the environment annually. Keywords: Solar PV, DC Residential House, DC Microgrids, PVsyst, Renewable Energy Copyright © 2017 Institute of Advanced Engineering and Science. All rights reserved. 1. Introduction Today renewable energy power system is becoming popular with the increase of energy demand and concerns on the carbon dioxide (CO2) emission to the environmental that will cause global warming [1]. Malaysia has move forward by promoting used of renewable energy such as solar PV to the public where it is generated at the distribution voltage level. The fluctuation of fuel prices become main concern to the consumers since affecting the electricity tariff because presently gas and coal are the dominant source of electricity generation [2]. Previous electricity tariff revision was conducted in 2014 where the average electricity tariff increased from 33.54 sen per kWh to 38.53 sen per kWh. All the categories have shown increment in tariff prices compared to former tariff except for two domestic customer groups. These groups are those who consumed electricity up to 200 kWh per month and also who used electricity between 201 and 300 kWh per month. Both groups represent majority of domestic users around 4.56 millions customers [3]. However, due to the nature of the fuel prices that fluctuates, there is no guarantee that the tariff for these two groups will be maintained. Currently there are two programs of solar PV system promoted by the Sustainable Energy Development Authority of Malaysia (SEDA) to the residential customers which are Feed- in Tariff (FiT) and Net Energy Metering (NEM). For the FiT scheme, all energy generated by the PV array will be exported directly to the utility grid. The mechanism of FiT has guaranteed a fixed selling prices which has to be paid to Feed-in Approval Holder (FiAH) by a utility company, to whose grid energy is exported for 21 years of contractual periods [4].This scheme is very popular among Malaysian and received high applications demand because of its high selling rates. For the NEM scheme, the connection is through an indirect feed where the energy generated from PV array will be used by the residential load first and the surplus energy will be exported to the utility grid. Up to date, the NEM is not as popular as FiT because of the selling price is not as good as FiT.