Learn how rooftop solar works in Canada's climate, what it costs, how net metering works, and how to choose a trustworthy installer.
Rooftop solar has gone from a niche hobby to a mainstream home upgrade in Canada. Panel prices have fallen a long way over the past fifteen years, more utilities have clear rules for connecting home systems, and many Canadians want more control over their energy bills. At the same time, homeowners face a confusing mix of sales pitches, changing incentives and technical jargon.
This course gives you the plain-language foundation you need. You'll learn how solar panels actually work, why Canada's sunshine is better for solar than many people assume, how to size a system using your own electricity bills, and what net metering means where you live. You'll also learn what drives cost and payback, and how to compare quotes from installers fairly.
Sundamentals is an independent non-profit. We don't sell solar systems, and we don't take commissions from installers. Our goal is simply to help you make a well-informed decision, whether that decision is to go solar now, later or not at all.
The course is free, self-paced and takes about an hour. It has three modules with short knowledge checks, followed by a 10-question final exam. Score 80% or higher on the exam and you'll be able to download a PDF certificate of completion with your name on it.
Solar photovoltaic (PV) panels are made of cells, usually built from silicon, that release electrons when sunlight hits them. That flow of electrons is direct current (DC) electricity. A single cell produces only a small amount of power, so dozens of cells are wired together into a panel, and several panels are wired together into an array on your roof or in your yard.
Your home runs on alternating current (AC), so the DC power from the panels passes through an inverter, which converts it into AC electricity your lights and appliances can use. Whatever your home doesn't use at that moment flows out to the grid through your meter, or into a home battery if you have one. At night, or when the panels aren't producing enough, you draw power from the grid as usual.
It helps to separate solar PV from solar thermal. Solar thermal collectors heat water or air directly and are a different technology with different economics. When most people talk about solar panels today, they mean PV, and that is the focus of this course.
A home solar system has no moving parts and runs quietly in the background. It produces the most power around midday, more in summer than in winter, and less on cloudy days, though panels still produce some electricity under overcast skies. Over a full year, those daily and seasonal ups and downs average out into a fairly predictable total.
Many people assume Canada is too cold or too far north for solar. In reality, solar panels need light, not heat. Natural Resources Canada's solar maps show that many Canadian cities receive as much sunlight over a year as, or more than, cities in Germany, which has been one of the world's solar leaders. The southern Prairies are among the sunniest places in the country.
Cold weather actually helps. Solar panels become slightly less efficient as they get hot, so a clear, crisp spring day can be ideal for production. What limits winter output in Canada is not the cold but the short days and the low angle of the sun.
Snow is a real factor, but a smaller one than most people expect. Panels are dark and usually tilted, so snow often slides off after a storm, especially once the sun comes out. Because winter days are short, the production lost to snow cover is a small share of the yearly total. Never climb onto a snowy roof to clear panels; it is dangerous and can scratch the glass.
The biggest seasonal pattern to understand is that most of your solar production happens from spring through early fall. In most of Canada, a sunny summer month can produce several times more electricity than December. That is why net metering rules, which let you bank summer credits, matter so much, and why you should always look at a full year of production rather than a single month.
Quality panels sold in Canada are tested and certified to handle snow loads, wind and hail. Ask your installer about the ratings for the specific equipment they propose, and make sure the racking is designed for your local snow and wind conditions.
Two units come up constantly in solar conversations, and mixing them up causes a lot of confusion. A kilowatt (kW) measures power, which is the rate at which electricity is produced or used at a given moment. A kilowatt-hour (kWh) measures energy, which is power used or produced over time. A 1 kW load running for one hour uses 1 kWh.
Solar systems are described by their size in kilowatts, such as a 6 kW system. Individual modern residential panels are commonly rated somewhere around 350 to 450 watts each. Your electricity bill, however, charges you for energy in kilowatt-hours. The useful question is how many kWh per year a system will produce, and how that compares to how many kWh your home uses.
To find your usage, gather 12 months of electricity bills or download the data from your utility's online account. A full year matters because usage swings with the seasons, especially if you heat or cool with electricity. In much of southern Canada, each kilowatt of well-placed solar panels produces very roughly 900 to 1,400 kWh per year, depending on location, orientation and shading.
Finally, look at how your bill is structured. Most bills include charges based on how much energy you use, plus fixed monthly charges for delivery, administration or connection. Solar reduces the energy you buy from the grid, but it usually cannot erase fixed charges. That is why even a well-sized system rarely drops a bill to exactly zero.
The best rooftop solar sites in Canada face roughly south, because that is where the sun spends most of the day. East- and west-facing roofs produce less, but they can still work well, and some homeowners use both sides of a roof. North-facing roof surfaces are generally a poor choice.
Shade is the next big question. Trees, chimneys, dormers and neighbouring buildings can all cast shadows that reduce output, and shade on even part of an array can affect more than just the shaded panels, depending on the equipment used. A good installer will do a shading analysis using satellite tools, a site visit, or both, and will show you how shading affects the estimated production.
Look at your roof's age and condition. Panels typically last 25 years or more, and removing and reinstalling them later to replace shingles adds real cost. If your roof is near the end of its life, it usually makes sense to replace it before installing solar. Your installer may also need to confirm the roof structure can carry the added weight and snow load.
If your roof isn't suitable, you may still have options, such as a ground-mounted array in a sunny yard or a garage roof. And before sizing any system, consider whether simple efficiency upgrades could cut your electricity use first, since a smaller system costs less.
Most residential panels sold today are monocrystalline silicon, which offers good efficiency in a compact footprint. Panels usually come with two warranties: a product warranty covering defects and a performance warranty, often 25 years, promising the panel will still produce a stated share of its original output. Quality panels typically lose only a small amount of output each year, often around half a percent.
The inverter is the brain of the system, and there are three common approaches. A string inverter is a single box that handles a whole group of panels; it is cost-effective but can be held back by shading on any panel in the string. Microinverters sit under each panel and convert power individually. Power optimizers also sit under each panel but send power to a central inverter. Panel-level options cost more but handle shading and complex roofs better and allow panel-by-panel monitoring.
Inverters generally don't last as long as panels, so plan for the possibility of an inverter replacement during the system's life, and check how long the inverter warranty runs. Racking and flashing hold the panels to the roof and seal every roof penetration against water, so workmanship here matters as much as the equipment brand.
In Canada, electrical equipment connected to your home must carry an approved certification mark, such as CSA or an equivalent recognized mark. Also note that a standard grid-tied system shuts itself off during a power outage. This protects line workers repairing the grid. If you want power during outages, you need a battery and compatible equipment, which is covered in our home battery course.
Most Canadian home solar systems are grid-tied, meaning they stay connected to the utility grid. When your panels produce more than your home is using, the extra electricity flows to the grid. When they produce less, you draw from the grid. Net metering, or a similar program, is the set of rules that decides how you are credited for the electricity you send out.
Under a typical net metering arrangement, exported electricity earns credits on your bill that can offset electricity you buy later, often carried forward for a period such as a year. This lets your sunny summer months help pay for your darker winter months. The details, however, vary a great deal. Each province and often each utility sets its own rules on credit value, how long credits last, maximum system size and fees.
For example, some programs credit exports at roughly the same rate you pay for energy, while others credit at a different rate or compensate you differently. Some cap the system size at what your home uses in a year. Because these rules shape your savings directly, read your own utility's current program terms or ask your installer to show you exactly which rules their savings estimate assumes.
Connecting a system also involves paperwork. Before installation, your installer usually applies to your local utility for a connection agreement. The work requires an electrical permit and inspection, and the utility may install a new bidirectional meter. Don't switch the system on until you have formal permission to operate.
The cost of a solar system depends on its size, the complexity of your roof, the equipment chosen and local labour costs. Installers often quote a total price and a price per watt. Price per watt is a useful way to compare quotes for systems of different sizes, as long as you also compare equipment quality and warranties.
Your savings depend on how much electricity the system produces, what you pay for electricity, and how your utility's net metering rules credit your exports. Where electricity prices are higher, the same system saves more. Simple payback, meaning how long it takes for savings to equal what you paid, is often a decade or more in Canada, and can be shorter where rates are high or incentives are available. Be wary of anyone promising free solar or a guaranteed tiny payback.
Incentives change often. The federal Canada Greener Homes Grant, which once helped with solar, closed to new applicants in 2024, and the related interest-free Greener Homes Loan is also closed. Today, support more often comes from provinces, municipalities and utilities, and it varies by location and over time. Check the Sundamentals rebate finder for current programs where you live, and confirm details with the program itself.
Financing options include personal loans, home equity lending, and in some municipalities, property-assessed programs that let you repay through your property tax bill. Read any lease or loan agreement carefully, including what happens if you sell your home. Finally, remember the environmental picture: solar avoids the most emissions in provinces whose grids still rely heavily on fossil fuels, such as Alberta and Saskatchewan.
Get at least three written quotes. Compare the system size in kW, the estimated yearly production in kWh, the brands and models of panels and inverters, the warranties on equipment and on workmanship, and who handles permits and the utility application. Ask how they estimated production and which net metering rules they assumed.
Check each company's track record: how long it has been in business, whether it carries liability insurance, whether its electricians are properly licensed in your province, and what recent customers say. A good installer is happy to answer questions and gives you time to decide.
Most solar systems need very little maintenance. Rain usually keeps panels clean enough, and you don't need to clear snow. Use the system's monitoring app to watch for sudden drops in production, which can signal an inverter problem or damage. After severe storms, look at the array from the ground, and call a professional for anything that needs roof access.
Let your home insurance provider know about the system so it is covered, and keep your contract, warranties, permits and inspection records together. You'll need them for warranty claims and if you ever sell the home.
Before you sign, read the contract closely. It should list the exact equipment, the total price and payment schedule, the expected timeline, who is responsible for any roof damage, and how warranty claims are handled. Ask whether the installer will still support the system if a manufacturer goes out of business, and get every promise that matters to you in writing rather than relying on a verbal assurance.
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