Pertanika J. Sci. & Technol. 30 (1): 221 - 233 (2022) ISSN: 0128-7680 e-ISSN: 2231-8526 Journal homepage: http://www.pertanika.upm.edu.my/ © Universiti Putra Malaysia Press SCIENCE & TECHNOLOGY Article history: Received: 21 May 2021 Accepted: 13 October 2021 Published: 14 December 2021 ARTICLE INFO DOI: https://doi.org/10.47836/pjst.30.1.12 E-mail addresses: azirahshukor@gmail.com (Fatin Azirah Mohd Shukor) hedzl506@uitm.edu.my (Hedzlin Zainuddin) jasrul@utm.my (Jasrul Jamani Jamian) nurmalessa@uitm.edu.my (Nurmalessa Muhammad) farah668@uitm.edu.my (Farah Liyana Muhammad Khir) noorhasliza@uitm.edu.my (Noor Hasliza Abdul Rahman) * Corresponding author Acceptance Ratio Analysis in Grid-Connected Photovoltaic System: Is There Any Diference Between DC and AC? Fatin Azirah Mohd Shukor 1 , Hedzlin Zainuddin 1,2 *, Jasrul Jamani Jamian 3 , Nurmalessa Muhammad 1,2 , Farah Liyana Muhammad Khir 1,2 and Noor Hasliza Abdul Rahman 2,4 1 Faculty of Applied Sciences, Universiti Teknologi MARA, 40450 UiTM, Shah Alam, Selangor, Malaysia 2 Faculty of Applied Sciences, SPECTRA Research Interest Group, Universiti Teknologi MARA, 40450 UiTM, Shah Alam, Selangor, Malaysia 3 Faculty of Engineering, Universiti Teknologi Malaysia, 81310 UTM, Johor Bahru, Johor, Malaysia 4 College of Engineering, Universiti Teknologi MARA, Cawangan Johor, Kampus Pasir Gudang, 81750 UiTM, Masai, Johor, Malaysia ABSTRACT The performance status of a grid-connected photovoltaic (GCPV) system is denoted by performance indices, namely performance ratio, capacity factor, and even through power acceptance ratio (AR), as documented in Malaysia Standard (MS) procedures for acceptance test of GCPV testing and commissioning (TNC). Even though AR analysis can be either on the DC or AC side, the MS TNC procedures implemented analysis on the AC side. Therefore, the question arises whether there is any signifcant diference when using AC AR analysis compared to DC AR analysis in evaluating the system performance. Thus, this paper evaluates the diferences between applying DC AR analysis and AC AR analysis in accessing the performance of the ten kW p GCPV system in Malaysia. The AR analytical analysis employed the 2019 one-year historical data of solar irradiance, module temperature, DC power, and AC power. The results demonstrated that the monthly AC AR were consistently lower than DC AR with a percentage diference of approximately 3%. The percentage discrepancy was due to the variation of actual inverter efciencies compared to the declared constant value by the manufacturer used in the AR prediction model. These fndings have verifed a signifcant diference between DC AR analysis and AC AR