Solar power has moved from a relatively unusual technology to a familiar sight on homes, businesses and large solar farms around the world.
Even so, some old ideas about solar panels have proved surprisingly difficult to shake.
You may have heard that solar panels don’t work on cloudy days, that they need constant maintenance or that installing solar means you can disconnect from the electricity grid completely.
Like most myths, there is often a small piece of truth buried somewhere inside them. The reality, however, is usually more interesting.
Let’s look at five common solar power myths and what actually happens.
Myth 1: Solar Panels Only Work in Hot, Sunny Weather
Solar panels certainly produce more electricity when they receive strong sunlight, but they don’t need a hot day to work.
Photovoltaic solar panels generate electricity from light rather than heat.
That means they can continue producing electricity when the weather is cool and even when the sky is cloudy. Output will generally be lower under heavy cloud because less sunlight reaches the panels, but generation doesn’t necessarily stop.
In fact, very high temperatures can slightly reduce the efficiency of solar cells.
This is why solar power isn’t restricted to deserts and tropical climates. Solar installations operate successfully in countries with very different climates and weather conditions.
What matters is the amount of usable sunlight a location receives over time, along with factors such as panel orientation, shading and system design.
Myth 2: Solar Panels Are Too Expensive to Be Worth Considering
There was a time when rooftop solar was prohibitively expensive for many households.
That has changed considerably.
The cost of solar technology has fallen dramatically over the past couple of decades, although the final cost of a household system still varies enormously between countries and regions.
Installation costs, labour, system size, electricity prices, government incentives and local regulations can all affect the economics.
This means claims such as “solar always pays for itself in five years” should be treated cautiously.
For one household, solar may offer substantial long-term savings. For another, the roof may be heavily shaded, electricity consumption may be very low or installation costs may make the financial case less attractive.
Solar has become much more accessible, but whether it is a good investment still needs to be calculated for the individual property.
Myth 3: Solar Panels Don’t Produce Enough Electricity to Be Useful
A single solar panel obviously won’t power an entire modern home.
A properly designed solar system can be a different story.
The amount of electricity a rooftop system produces depends on its size, the amount of sunlight it receives, its orientation, shading, panel performance and local weather.
Household electricity consumption also varies enormously.
One home may use relatively little electricity during the day. Another may be running air conditioning, heating, a swimming pool, home office equipment and an electric vehicle.
For this reason, asking whether “solar can power a house” doesn’t have a simple yes-or-no answer.
A suitably sized system may generate as much electricity over a year as a household consumes, but that doesn’t mean the home is powered directly by solar every minute of every day.
Solar production and household demand occur at different times.
That brings us to another common misconception.
Myth 4: Solar Panels Mean You Don’t Need the Electricity Grid
Most rooftop solar homes remain connected to the electricity grid.
During sunny periods, the panels may produce enough electricity to meet the home’s immediate needs. Excess electricity can sometimes be exported to the grid.
At night, the panels produce no electricity, so a grid-connected home normally draws electricity from the network unless another source such as a battery is available.
Adding battery storage can increase the amount of solar electricity a household uses itself by storing surplus daytime generation for later.
But even a home with solar and a battery doesn’t automatically become completely independent from the grid.
True off-grid systems need enough generation and storage to cope with nights, poor weather and periods of unusually high electricity consumption. They may also need backup generation.
Going off-grid is possible, particularly in remote locations, but it requires much more careful system design than simply putting solar panels on a roof.
Myth 5: Solar Panels Require Constant Maintenance
Solar panels don’t contain the type of moving mechanical parts found in engines or turbines, so routine maintenance is generally fairly limited.
Rain can remove some dust and dirt, although panels may occasionally need cleaning in areas affected by heavy dust, bird droppings, leaves, salt or other debris.
The more important issue is making sure the complete solar system continues operating correctly.
Inverters, electrical connections, mounting equipment and batteries, where fitted, are also part of the system and can require inspection, maintenance or eventual replacement.
Solar panels themselves are designed for long service lives, but that doesn’t mean they should be installed and completely forgotten.
Monitoring system output can help identify an unexpected drop in performance before years of lost generation go unnoticed.
What About Solar Panel Waste?
Another concern increasingly raised about solar power is what happens when panels reach the end of their working lives.
It is a legitimate question.
Solar panels contain materials including glass, aluminium, silicon, copper and other components. Recycling systems for retired panels are developing, but availability and recycling requirements differ around the world.
As the first large generations of solar installations eventually reach retirement age, recycling and responsible disposal will become increasingly important.
That doesn’t make solar energy environmentally impact-free.
Like wind turbines, batteries, power stations, vehicles and almost every other manufactured technology, solar panels require raw materials, manufacturing, transport and eventual disposal or recycling.
The useful comparison isn’t between solar power and something with no environmental impact.
It is between different ways of producing electricity and the impacts each creates over its complete life cycle.
Is Solar Power Right for Every Home?
No.
And it doesn’t need to be.
A heavily shaded roof may perform poorly. Apartment residents may not control their rooftop. Some buildings have unsuitable roof structures or orientations, while others may have such low electricity consumption that a large system makes little financial sense.
Community solar and other shared renewable projects can sometimes provide alternatives where individual rooftop systems aren’t practical.
For suitable properties, however, rooftop solar can provide decades of electricity generation from a resource that arrives every morning for free.
Look Beyond the Solar Myths
Solar power isn’t perfect, and pretending otherwise doesn’t help anyone make sensible energy decisions.
Panels don’t generate electricity at night. Cloud reduces their output. Systems cost money to install. Equipment eventually needs replacing, and the industry still needs better recycling systems as more panels reach the end of their lives.
But those limitations are very different from many of the myths that continue to circulate about solar energy.
Modern solar technology works in a wide range of climates, requires relatively little routine maintenance and can provide a significant share of a household’s electricity when the property and system are suitable.
The useful question is no longer whether solar power works.
It is whether solar power works well for your particular home, location and energy needs.
Be the first to comment