If you're planning to buy bifacial solar panel technology for your home, business or commercial project, choosing the right panel is an important decision. With different power ratings, efficiencies, sizes and manufacturers available, it can be difficult to know which option is best for your installation.
The highest-wattage panel isn't always the best choice. Your available space, energy requirements, mounting system and installation conditions should all be considered before making a purchase.
Start With Your Energy Requirements
Before choosing your panels, consider how much electricity your property or business needs.
A residential system will have different requirements from a large commercial or ground-mounted installation. Understanding your expected energy consumption can help determine the overall system size and the number of panels required.
You should also consider whether you plan to add battery storage, as this can affect the overall design of your solar system.
Check the Panel's Power Rating
Solar panel power is measured in watts (W). This represents the panel's rated output under standard testing conditions.
Higher-wattage panels can be useful when installation space is limited because fewer modules may be needed to achieve the required system capacity.
However, wattage should not be the only specification you compare. Efficiency, dimensions and bifacial performance are also important.
Compare Panel Efficiency
Panel efficiency describes how effectively a module converts sunlight into electricity.
A higher-efficiency panel can be particularly useful when you have limited roof or ground space because more power can be generated from a smaller area.
When looking to buy bifacial solar panel equipment, compare both the panel's rated power and efficiency to get a better understanding of its potential performance.
Understand the Bifaciality Factor
The bifaciality factor is one of the key specifications to look at when comparing bifacial modules.
It indicates how effectively the rear side of the panel can generate electricity compared with the front under comparable conditions.
A higher bifaciality factor can be beneficial when there is plenty of useful light reaching the rear of the panel.
However, bifaciality alone doesn't determine how much extra electricity the system will produce. The installation must also provide suitable conditions for rear-side generation.
Consider Where the Panels Will Be Installed
The type of installation can have a major effect on the performance of bifacial panels.
Ground-Mounted Systems
Ground-mounted solar systems can be particularly suitable because the panels can be raised above the ground, allowing reflected light to reach their rear surfaces.
Commercial Installations
Commercial projects can benefit from carefully planned layouts and mounting structures that provide good rear-side exposure.
Solar Car Parks
Solar car parks use elevated structures that can allow light to reach both sides of the panels, making bifacial technology an attractive option for some projects.
Residential Rooftops
Bifacial panels can also be installed on homes, although their potential additional generation depends on the roof surface, panel elevation and mounting configuration.
Check the Panel Dimensions
The physical size of the panel is another important consideration.
A high-wattage panel isn't necessarily the best option if it doesn't fit your available installation area or mounting system.
Before you buy bifacial solar panel equipment, check:
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Panel length and width
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Panel weight
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Number of panels required
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Available installation space
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Mounting requirements
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Roof or ground loading requirements
This can help prevent compatibility problems during installation.
Look at the Warranty
Solar panels are designed to operate for many years, making warranty coverage an important part of the purchasing decision.
Check both the product warranty and performance warranty. It's also worth looking at the manufacturer's expected degradation rate and long-term performance guarantees.
A panel that maintains strong performance over many years can provide better overall value.
Consider Temperature Performance
Solar panels can perform differently as their operating temperature changes.
The temperature coefficient is therefore another specification worth reviewing when comparing panels.
Understanding how a module is expected to perform in different temperatures can help you make a more informed decision, particularly for installations exposed to significant temperature variations.
Make Sure the Panels Are Compatible
Your bifacial panels need to work correctly with the rest of the solar system.
Before purchasing, check compatibility with:
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Solar inverters
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Mounting systems
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Battery storage
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Monitoring equipment
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Electrical protection equipment
The panel's voltage and current characteristics should be suitable for the selected inverter and other components.
Think About Rear-Side Exposure
One of the biggest advantages of bifacial panels is their ability to generate electricity from light reaching the rear.
Before you buy, consider how much useful light will actually reach the back of the modules.
Ask yourself:
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Is the surface underneath reflective?
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Are the panels sufficiently elevated?
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Is there enough spacing between modules?
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Could nearby buildings or trees create shading?
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Can reflected sunlight reach the rear surface?
These factors can have a major impact on the additional energy generated by bifacial technology.
Compare the Overall Value
When you buy bifacial solar panel equipment, don't automatically choose the cheapest option.
Instead, consider the complete value of each panel, including:
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Purchase price
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Power output
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Efficiency
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Bifaciality
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Warranty
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Degradation rate
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Expected energy generation
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Installation requirements
A panel with a slightly higher upfront cost may provide better long-term value if it produces more electricity and maintains strong performance over its operating life.
Consider the Manufacturer
The manufacturer is another factor worth considering.
Look for established manufacturers with clear technical specifications, reliable warranties and a strong track record in the solar industry.
This can provide greater confidence that the panels will perform as expected over the long term.
Get Professional Advice
If you're unsure which bifacial panel is right for your project, an experienced solar installer can assess your site and recommend suitable options.
A professional assessment can take into account:
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Energy consumption
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Available space
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Shading
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Orientation
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Tilt
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Surface reflectivity
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Mounting arrangement
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Expected bifacial gain
This can help ensure the panels you purchase are properly matched to your solar system.
Conclusion
Choosing the right bifacial solar panel involves much more than comparing wattage and price. Efficiency, bifaciality, dimensions, warranty, temperature performance and installation conditions should all be considered.
If you're planning to buy bifacial solar panel equipment, taking the time to compare these factors can help you choose panels that provide strong performance and long-term value.
The right panel, combined with a carefully designed installation, can help you make the most of both direct and reflected sunlight.
In the next article in this series, we'll look at installation tips for bifacial solar panels and how to maximise energy generation.
