Choosing solar panels comes down to five things: how much power you need, how much space you have, the panel technology, how the panel handles Canadian weather, and the warranty behind it. This guide walks through each one, with what we see Canadian homeowners, cottage owners, farmers and installers buy every day at our Waterloo, Ontario warehouse.
1. Start with how much power you need
Look at your electricity bills for the last 12 months and find your average daily use in kilowatt-hours (kWh). Divide your annual use by the number of kWh one kilowatt of panels produces where you live: across most of southern Canada, 1 kW of well-placed panels produces roughly 1,100 to 1,400 kWh a year, more in the Prairies and less in cloudy coastal areas. Natural Resources Canada publishes photovoltaic potential maps by municipality if you want a closer number.
For a step-by-step calculation, see our guide on how many solar panels you need for your home. For an RV, van or boat, see our RV and portable solar panel guide.
2. Panel technology: what the labels mean
Monocrystalline vs polycrystalline
Almost every full-size panel sold today is monocrystalline: the cells are cut from a single silicon crystal, which makes them more efficient (typically 20% to 23%) and darker in colour. Polycrystalline panels, with their blue speckled look, are less efficient and have largely disappeared from the market. If you are comparing new panels, compare monocrystalline models with each other.
N-type TOPCon vs older PERC cells
Most new high-efficiency panels use N-type cells with TOPCon (tunnel oxide passivated contact) technology, which replaced the older P-type PERC design. N-type panels generally lose less power in the first year, degrade more slowly over time and handle heat better, which is why manufacturers now offer 30-year power warranties on many of them. Canadian Solar's TOPHiKu6 and TOPBiHiKu6 panels and most current JA Solar and LONGi panels are N-type.
Bifacial vs monofacial
Bifacial panels have a glass back, so they also produce power from light reflected onto the rear side. Snow is very reflective, which makes bifacial panels a strong choice for ground mounts and raised racking in Canada. On a flush-mounted roof the rear side sees little light, so the gain is small. Our bifacial vs monofacial guide explains when the extra cost pays off.
Rigid vs flexible
Homes, cottages and farms should use rigid framed panels: they last longest and carry the strongest warranties. Flexible and foldable panels are for RVs, boats and camping, where weight and portability matter more than lifespan.
3. Wattage and size
| Panel size | Typical dimensions | Best for |
|---|---|---|
| 100W–200W (12V) | About 1 m long | RVs, vans, sheds, small cabin systems |
| 400W–455W | About 1.7 m × 1.1 m | House and cottage roofs; easier for one or two people to lift |
| 500W–550W | About 2.0–2.3 m long | Larger roofs and ground mounts |
| 600W–720W | About 2.4 m × 1.1–1.3 m, 30+ kg | Ground mounts, farms, commercial arrays |
A higher wattage only matters if it fits. Measure your roof or ground area, allow for setbacks from roof edges required by your local fire code, and check that your racking is rated for the panel's size and weight. Bigger panels mean fewer panels, fewer clamps and less wiring for the same output.
4. Ratings that matter in a Canadian climate
- Snow load: listed in pascals (Pa). Look for at least 5,400 Pa on the front for most of Canada; some panels, like the Canadian Solar 450W TOPHiKu6, are tested to 8,100 Pa.
- Wind load: 2,400 Pa is standard; 4,000 Pa or more is better for exposed sites, coastal areas and the Prairies.
- Hail: most panels are tested with 25 mm hailstones; some are rated for larger hail, which is worth having in Alberta and Saskatchewan.
- Cold-weather voltage: panel voltage rises in the cold. When you design strings, use the panel's open-circuit voltage (Voc) and temperature coefficient with your area's lowest expected temperature so the string never exceeds your inverter or charge controller's maximum input voltage.
- Certification: panels connected to your home's wiring should carry a Canadian certification mark (CSA, cUL or cETL) to pass electrical inspection.
5. Warranties: product vs performance
Every panel has two warranties. The product warranty covers defects and typically runs 12 to 25 years. The performance warranty guarantees the panel will still produce a set percentage of its rated output, often around 87% to 89% after 30 years for current N-type panels. Buy from a seller who will help you make a claim, and keep your receipt and serial numbers.
6. Brands
Canadian Solar, LONGi, JA Solar and Trina are among the largest panel manufacturers in the world, with long track records and established warranty support. Smaller brands can offer good value, but check how long the company has made panels and who handles warranty claims in Canada. You can compare brands side by side on our solar panels page or see our Canadian Solar panels.
7. What solar panels cost in Canada
As of October 2026, full-size panels at ROCKSOLAR cost roughly C$180 for a 450W panel and C$260 for a 620W panel bought individually, or about C$0.40 per watt. Buying a full pallet of 27 to 36 panels brings that down to roughly C$0.30 per watt. Panels are only part of a system: mounting hardware, inverter, wiring, batteries (if you want backup or are off-grid), permits and installation make up the rest. Check our current panel prices and pallet prices.
8. Panels on their own or a complete kit?
If you already have an inverter, or an installer is designing your system, buy panels on their own. If you are starting from scratch, a matched kit saves you from compatibility mistakes: see our solar panel kits and off-grid solar systems for homes and cottages.
Frequently asked questions
Which solar panel is best for a house in Canada?
For most roofs, a 400W to 455W monocrystalline N-type panel with a snow load of 5,400 Pa or more and a 25-year product warranty. All-black panels look best on dark roofs.
Are bigger panels always better?
No. 600W+ panels are cheaper per watt and need fewer mounts, but they are heavy and long, so they suit ground mounts better than most residential roofs.
Do solar panels work in winter?
Yes. Panels are more efficient in the cold; output drops in winter mainly because days are shorter and snow covers the panels. Steeper tilt angles help snow slide off.
Do I need an electrician?
Panels connected to your home's electrical system or the grid should be installed by a licensed electrician, and most provinces require a permit and inspection. See our solar panel installation guide.
Not sure which panel fits your project? Call us at 1-800-858-4318 or send us your details and we'll recommend panels and quantities.
