Choosing the right solar system size is one of the most important decisions for a business. An undersized system may still generate useful electricity, but it may not provide enough power to meet the business’s actual energy demand. Understanding what happens when a commercial
solar system is too small can help businesses avoid making an expensive decision that limits future value.
Quick Answer
When a commercial solar system is too small, a business may continue purchasing significant amounts of electricity from the grid. The system may not generate enough energy to meet daytime demand, particularly as the business grows. Correct system sizing should consider current electricity usage, operating hours, available roof space and future energy requirements.
How Can You Tell If a System Is Too Small?
A commercial solar system may be undersized if:
- Grid electricity use remains high during daylight hours.
- The business regularly consumes more electricity than the solar system produces.
- Energy-intensive equipment has been added since installation.
- Business operations have expanded.
- Electricity demand has increased significantly.
However, high electricity bills alone do not necessarily mean the solar system is too small. System performance and energy usage should be professionally assessed.
What Problems Can an Undersized System Create?
Continued Reliance on Grid Electricity
If your business needs more electricity than the solar system generates, the remaining demand must come from the grid.
This can be particularly noticeable for businesses operating machinery, refrigeration, air conditioning or other energy-intensive equipment.
Less Solar Energy Available for Business Operations
An undersized system may generate only a portion of the electricity your business requires during operating hours.
Limited Support for Future Growth
A system designed only around today’s needs may become less suitable when the business expands.
Additional energy demand could come from:
- New machinery
- Electric vehicle charging
- Larger refrigeration systems
- Extended operating hours
- Warehouse expansion
Why Correct System Sizing Matters?
The goal isn’t simply to install the largest possible solar system.
Instead, businesses should consider:
Current Electricity Usage
Review electricity bills and identify when your business consumes the most energy.
Daytime Demand
Solar generation occurs during daylight hours, making daytime consumption particularly important when designing a commercial system.
Available Roof Space
The roof needs to be assessed for condition, shading, orientation and structural suitability.
Future Energy Requirements
If your business expects electricity demand to increase, those plans should be considered before installation.
Can an Undersized Solar System Be Expanded?
Sometimes.
The ability to expand an existing system depends on factors such as:
- Inverter capacity
- Available roof space
- Electrical infrastructure
- Existing equipment compatibility
- System design
This is why future expansion should ideally be considered before the original installation.
Common Questions Businesses Ask
Is a smaller solar system always a bad choice?
No. A smaller system may be appropriate for a business with limited electricity demand or roof space.
Should I install the biggest system possible?
Not necessarily. The system should match your business’s energy consumption, property and future plans.
Can battery storage fix an undersized solar system?
A battery can store excess energy, but it cannot create additional solar generation. If the underlying solar system is too small, battery storage alone may not solve the problem.
Should businesses plan for future electricity demand?
Yes. Future machinery, EV charging, expansion and changing operating hours can significantly affect energy requirements.
Key Takeaways
- An undersized commercial solar system can leave businesses heavily reliant on grid electricity.
- High electricity usage does not always mean the solar system is too small.
- Correct system sizing should consider both current and future energy demand.
- Battery storage cannot replace insufficient solar generation.
- Future expansion should be considered during the initial design.
- A professional assessment can help determine whether an existing system needs upgrading.
Conclusion
A commercial solar system should support the way your business operates today while allowing room for future energy needs. If your electricity consumption has increased since installation, it may be time to review whether your current system is still suitable.
Think your commercial solar system may be too small for your business? Talk to our experts on 1300 025 955 and discover whether your existing system can be improved or upgraded to better match your business’s energy requirements.
