UNIVERSITAS BUNG HATTA DESIGN OF A HYBRID-CONNECTED ROOFTOP SOLAR POWER PLANT AT THE WAREHOUSE OF PT. COSL INDONESIA DURI BASE

This study presents the technical design of a hybrid-connected rooftop photovoltaic
(PV) system for the warehouse of PT. COSL Indonesia Duri Base, Riau. The
research is motivated by frequent grid interruptions and the need to reduce reliance
on fossil-based electricity while maintaining supply reliability. Load data were
obtained from on-site observations and PLN token records, while solar resource
data (GHI and temperature) were taken from NASA/Global Solar
Atlas/WeatherSpark. Using manual calculations, a daily load profile was compiled
with a total energy demand of 139.136 kWh and a peak load of 13.7 kW at 09:00.
The resulting design specifies a 48.64 kWp rooftop PV array using 108
monocrystalline 450 Wp modules (18S3P) integrated with a 60 kW three-phase
hybrid inverter. A LiFePO₄ battery system of 30.72 kWh (3 modules) was selected
to provide backup capacity. Protection devices (MCBs), appropriate cable sizing,
and a 16 A Automatic Transfer Switch (ATS) were determined to ensure safe
operation. Overall, the proposed design meets technical specifications, covers the
warehouse’s daytime demand, and ensures reliable supply during grid outages. This
study demonstrates that the system is technically feasible and provides a reference
for industrial rooftop PV planning.
Keywords : Hybrid-Connected PV, Rooftop Solar, Warehouse Load Profile,
Inverter/SCC Sizing, Battery Backup, Indonesia, GHI