<![CDATA[This study analyzes the performance of a 59.94 kWp rooftop solar power plant consisting of 162 monocrystalline modules rated at 370 Wp each. The system uses two inverters: Inverter 1 serves 81 west-facing modules, while Inverter 2 serves 81 east-facing modules. The analysis combines t-tests, z-tests, and ANOVA applied to production data from August 2021 to October 2024, simulations using PVsyst 7.2 and HelioScope, and techno-economic and environmental assessments. During 2021–2022, no significant performance difference was found between the two inverters, with average daily production of 97.65 kWh for Inverter 1 and 97.15 kWh for Inverter 2. However, during 2023–2024, Inverter 1 experienced a significant decline, averaging 65.54 kWh/day compared with 87.21 kWh/day for Inverter 2. This decline was also reflected in Inverter 1’s consecutive daily Capacity Utilization Factor values of 13.71%, 12.20%, 9.92%, and 9.11%. After corrective action in December 2024, Inverter 1 returned to optimal performance and became comparable with Inverter 2. The repair increased the solar power contribution to the load from 32.75% to 38.17% and reduced dependence on the PLN grid to 61.83%. Post-repair, 95.31% of generated energy was absorbed by the consumer load, while 4.69% was exported to the grid. Environmentally, the repair reduced CO₂ emissions by an amount equivalent to 31,457.46 tons of lignite coal. Economically, the system has a 25-year payback period, an NPV of IDR 10,727,123, and an LCOE of IDR 791.59/kWh.]]>
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