Solar 101
Top Things to Look for in Solar Panels
Efficiency, durability and warranty are the three key things to compare when choosing solar panels for your Ontario home. Here is how to evaluate each.
Efficiency, durability and warranty are the three key things to compare when choosing solar panels for your Ontario home. Here is how to evaluate each.
Wondering whether solar panels are worth it in Ontario? As clean energy becomes more important, rooftop solar has become one of the most popular ways to produce power at home. But panels are not all identical, and when you choose a system, you are making an investment you will live with for decades. In this guide we cover the three most important things to look for in a solar panel: efficiency, durability and warranty.
Efficiency describes how much of the sunlight hitting a panel is converted into usable electricity. The more efficient a panel is, the more power it generates from the same area, so you may need fewer panels to reach your target. That matters most when roof space is limited, for example on smaller homes or roofs with several sections and obstructions.
Efficiency is expressed as a percentage on the manufacturer's datasheet. Typical residential panels range from the high teens to the low 20s percent, while premium models are higher. When comparing, look at efficiency alongside price, since a slightly less efficient panel can still be the better value if you have plenty of roof space.
Solar panels are designed to stay outside in all weather, but some are tougher than others. In Ontario, panels need to handle winter snow loads, strong winds, ice and big temperature swings. Look for panels built from quality materials with tempered glass, a sturdy frame and good sealing against moisture.
Check that the panel carries recognized safety and performance certifications, and look at the mechanical load ratings listed on the datasheet. Durability is also about the whole system: the racking, the roof attachment and the wiring need to be installed correctly. That is why who installs your system matters as much as what is on the datasheet. For a deeper look at longevity, see how long solar panels last.
A solid warranty protects your investment. There are usually two panel warranties to understand:
Look for coverage of at least 25 years, which matches the expected life of most panels. You should also understand who handles a claim, and whether labour is covered if equipment must be replaced. In addition, the installer should back their own work: roof penetrations, wiring and system setup can be a source of issues if done poorly.
At Terawatt Solar, our panels carry a 25-year warranty and our installations are covered by an 8-year workmanship warranty. Our systems use SolarEdge inverters, which include online monitoring so you can see how your system is producing.
The panel is only part of the picture. The inverter converts DC power from the panels into AC power for your home, so its quality and monitoring features affect your system's reliability. And the best equipment will not perform well if it is installed incorrectly. Look for ESA-licensed electricians, proper permits and a clear plan for utility connection. Read our overview of residential solar installation to see what a complete project involves.
Efficiency, durability and warranty are three of the most important factors when choosing solar panels. If you would like help weighing the options for your home, contact Terawatt Solar for a free solar analysis. We are happy to answer your questions and support your switch to cleaner energy.
Typical residential panels today range from roughly the high teens to low-to-mid 20 percent efficiency, with premium models at the top of that range. Check the datasheet for the exact figure.
Look for a product and performance warranty of at least 25 years, plus a separate workmanship warranty from the installer.
It depends on your roof, usage and goals. A free site assessment gives you numbers for your home, and our guide to whether solar is worth it in Ontario explains the factors.
