A practical guide explaining how solar installations work for factories in Singapore, including system sizing, electricity generation potential and typical return on investment.
Industrial facilities such as factories often consume large amounts of electricity during daytime production hours. Because solar photovoltaic systems generate the most energy during daylight, factories are particularly well suited to benefit from rooftop solar installations.
Many factory buildings in Singapore also have large roof surfaces with relatively simple layouts. These roofs can accommodate large scale solar PV systems capable of generating substantial amounts of electricity.
By installing solar systems directly on the factory roof, businesses can offset a meaningful portion of their operational electricity demand while reducing long term energy costs.
The size of a solar installation on a factory building depends primarily on the available roof space and the building’s structural capacity. In Singapore, factory rooftop solar systems commonly range from around 300 kWp to more than 2 MWp.
As a general reference:
Actual system capacity will depend on roof design, structural loading limits, shading conditions and required safety walkways. In Singapore, solar photovoltaic systems typically receive around 3.2 - 3.6 peak sun hours per day, primarily between 11am and 3pm when solar irradiance is strongest. Peak sun hours represent the equivalent number of hours per day when sunlight intensity averages 1,000 W/m², which is the standard reference used to rate solar panels in kilowatts peak (kWp). These conditions are used to estimate the expected electricity generation of a solar system installed in Singapore.
Solar PV systems installed in Singapore typically produce between 1,250 and 1,400 kilowatt hours per kilowatt peak (kWh/kWp) annually depending on system design and installation conditions.
For example:
• A 500 kWp factory solar installation may generate approximately 650,000 kWh per year
• A 1 MWp system may generate more than 1.3 million kWh annually
• A 2 MWp system may exceed 2.6 million kWh per year
This level of electricity production can offset a significant portion of energy consumption for manufacturing equipment, HVAC systems and other industrial operations. In Singapore, solar systems generally receive around 3.2–3.6 peak sun hours per day, primarily between 11am and 3pm when solar irradiance is strongest.
Industrial solar installations in Singapore generally achieve a payback period between four and seven years depending on system size, electricity tariffs and financing structure.
Several factors influence the return on investment:
• Electricity consumption patterns within the facility
• The proportion of solar electricity consumed on site
• System design efficiency and equipment performance
• Available financing or leasing arrangements
Because solar photovoltaic systems typically operate for more than 25 years, factories can continue benefiting from reduced electricity costs long after the initial investment has been recovered.
Installing solar systems on factory rooftops requires careful engineering evaluation to ensure long term safety and performance.
Structural assessments must first confirm that the building can support the additional load from solar modules and mounting structures. Electrical infrastructure must also be reviewed to determine inverter placement, cable routing and grid interconnection requirements.
In many cases, professional solar installers conduct detailed site surveys and performance modelling before finalising the system design to maximise energy generation and maintain compliance with Singapore’s electrical standards.
For many industrial companies in Singapore, rooftop solar installations are becoming an important part of long term energy management strategies.
By generating electricity on site, factories can reduce exposure to fluctuating electricity prices while improving operational sustainability. Solar installations can also support ESG reporting requirements and corporate environmental commitments.
Large industrial rooftops represent a valuable asset that can be used to generate clean electricity for decades with relatively low operating costs once installed.
Businesses considering solar systems for factories, warehouses or other commercial facilities can learn more about how systems are engineered and installed by exploring UTICA® commercial solar installation services.
These systems are designed to maximise efficiency and shorten ROI timelines while ensuring reliable long term performance under Singapore’s climate conditions.