Solar energy has helped many Nigerian homes and businesses reduce their dependence on generators and unstable grid electricity. But sometimes, after installing a solar system, people begin to notice something frustrating.
The system does not perform as expected.
Maybe the batteries drain too quickly.
Maybe the inverter shuts down when certain appliances are turned on.
Or maybe the solar panels seem to produce far less energy than the installer promised.
Over the years working with solar systems, I’ve inspected several installations where clients complained that their solar system was “not strong.” In many cases, the problem was not the solar technology itself — it was something hidden in the design or installation.
In this article, I’ll explain the most common reasons solar systems underperform in Nigeria, based on real situations I’ve encountered during inspections and installations.
When a Solar System Looks Good but Performs Poorly
One situation I remember clearly involved a small electronics workshop that installed a solar system hoping to reduce generator use.
At first, everything seemed fine. The panels were mounted neatly, the inverter looked powerful, and the battery bank was new.
But after a few weeks, the owner noticed a problem.
Whenever they powered several tools at the same time, the inverter alarm would start beeping and the system would shut down.
The client thought the inverter was faulty.
After checking the system carefully, I discovered the real issue — the system had been installed without a proper load analysis.
This is one of the most common reasons solar systems underperform.
Problem #1: Poor Load Assessment
Before installing any solar system, the first step should always be calculating the total electricity demand.
Unfortunately, many installers skip this step.
Instead of measuring actual power consumption, they simply recommend a system size based on guesswork.
But electrical appliances have different power requirements.
For example:
Refrigerators have starting surges
Air conditioners draw heavy power
Water pumps require high starting current
Freezers run for long periods
If these loads are not properly calculated, the solar system may struggle to handle the demand.
The result is a system that frequently overloads or drains the batteries too quickly.
From my experience, the correct approach is always to perform a detailed load audit before recommending equipment.
This means listing all appliances and calculating their energy usage realistically.
Problem #2: Undersized Battery Capacity
Another issue I see often is batteries that are too small for the system.
Sometimes clients try to reduce installation cost by buying fewer batteries. Other times, the installer simply recommends the wrong battery size.
But batteries play a very important role in a solar system.
They store energy produced during the day and supply electricity when sunlight is not available.
If the battery capacity is too small, the system will experience problems like:
Batteries draining quickly at night
Inverter shutting down early
Reduced backup time during outages
I once inspected a home where the owner complained that his solar system could only last a few hours at night.
After checking the installation, it became clear that the battery bank was undersized compared to the load.
The inverter itself was powerful enough, but the batteries could not support the energy demand.
Once the battery capacity was upgraded, the system performance improved significantly.
Problem #3: Solar Panels Not Producing Enough Power
Sometimes the issue is not with the batteries or inverter but with the solar panels themselves.
Panels are the part of the system that actually generate electricity. If their output is low, the entire system suffers.
There are several reasons this can happen.
Poor Panel Placement
Solar panels must receive maximum sunlight during the day.
If they are installed in a location with shading from nearby buildings, water tanks, or trees, their output can drop significantly.
Even small shadows can affect performance.
I once visited a site where a large antenna on the roof was casting a shadow over several panels every afternoon.
The client never noticed the problem until we inspected the roof closely.
After repositioning the panels, energy production improved.
Wrong Panel Angle
Another mistake is installing panels at the wrong tilt angle.
Solar panels should be positioned in a way that allows them to capture the most sunlight during the day.
Flat or poorly angled panels may produce less electricity.
In Nigeria, panels usually perform best when installed with a moderate tilt facing the right direction.
Small adjustments can make a noticeable difference in energy output.
Dirty Panels
Dust accumulation is another common issue.
In some regions, especially during the dry season or harmattan period, dust can build up on solar panels.
This layer of dirt reduces the amount of sunlight reaching the solar cells.
Cleaning panels every few weeks helps maintain optimal performance.
Problem #4: Poor Wiring and Cable Connections
Wiring problems are another hidden cause of solar system underperformance.
Solar installations involve both DC and AC electrical connections, and proper cable sizing is extremely important.
If cables are too small for the current flowing through them, several issues can occur:
Voltage drops
Heat buildup
Energy losses
Reduced system efficiency
In one system I inspected, the installer used undersized DC cables between the solar panels and inverter.
The result was noticeable power loss before the electricity even reached the inverter.
After replacing the cables with properly rated ones, the system output improved.
This is why professional installations always follow proper electrical standards.
Problem #5: Cheap or Fake Solar Equipment
Unfortunately, the Nigerian solar market also contains fake or low-quality equipment.
Some clients unknowingly purchase refurbished solar panels or batteries sold as new.
These components may appear fine at first but degrade quickly.
Common signs of poor equipment include:
Panels producing far less than their rated output
Batteries losing capacity within months
Inverters shutting down frequently
Solar equipment should always come from reputable suppliers with proper warranties.
Quality components may cost more initially, but they perform better and last longer.
Problem #6: Incorrect Inverter Configuration
Even when the equipment is correct, the system may still underperform if the inverter settings are wrong.
Modern inverters allow installers to configure several parameters, including:
battery charging voltage
low voltage cutoff
grid priority settings
charging current limits
If these settings are not properly adjusted, the system may behave unpredictably.
For example, a wrong low-voltage cutoff setting can cause batteries to stop supplying power too early.
Proper configuration ensures the system runs efficiently and protects the batteries from damage.
How to Diagnose Solar System Performance Issues
When a client complains that their solar system is not performing well, the first step is always a detailed inspection.
This usually involves checking:
solar panel output during sunlight hours
inverter performance and error logs
battery voltage levels
wiring and cable conditions
load demand compared to system capacity
Sometimes the problem turns out to be something simple, like dirty panels or a loose cable connection.
Other times it requires adjusting system design or upgrading components.
But with proper analysis, most solar performance issues can be resolved.
Preventing Solar System Underperformance
The best way to avoid solar system problems is proper planning from the beginning.
A well-designed system should include:
accurate load assessment
correct inverter capacity
adequate battery storage
quality solar panels
professional installation
proper system protection
Solar installations should never be rushed or designed purely based on budget.
Taking the time to design the system properly ensures long-term performance and reliability.
Final Thoughts
Solar energy works very well in Nigeria when systems are designed and installed correctly.
But when shortcuts are taken — whether during load calculation, wiring, equipment selection, or installation — performance problems can appear.
From my experience inspecting and installing solar systems, most underperformance issues are not caused by solar technology itself.
They are usually caused by design mistakes or poor installation practices.
Understanding these issues helps homeowners and business owners ask the right questions before investing in solar energy.
A properly designed system should provide reliable electricity for many years.
And when everything is done correctly, solar power becomes one of the most dependable and cost-effective energy solutions available.
About the Author
Ekeson Collins
Founder of Ekeson Energy Solution
Solar Installer • Energy Consultant • Renewable Energy Advocate
Ekeson Collins shares practical insights from real solar installation projects to help Nigerian homes and businesses understand solar energy better and avoid common mistakes when investing in renewable power solutions.
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