Which solar panels to buy in South Africa
Tony Lopes
Short answer: Compare wattage, efficiency, the product and performance warranties, and whether the manufacturer has a real presence in South Africa. Then check the panels suit your roof space and inverter. Most reputable mono-crystalline panels perform similarly; correct design and installation make a bigger difference to your output than the brand.
Last updated November 2026.
Panels are the most visible part of a solar installation, and the part quotes compete on most loudly. This brand-neutral guide explains the specifications that matter, which ones don't, and how to compare panels across quotes.
How do I choose solar panels in South Africa?
| What to check | What good looks like |
|---|---|
| Wattage | Residential panels are now commonly 450 to 600 W each. Higher wattage means fewer panels for the same output, which helps on small roofs. |
| Efficiency | Around 21% to 23% for current mono-crystalline panels. It matters mainly when roof space is limited. |
| Product warranty | Covers defects. 12 to 25 years is typical. |
| Performance warranty | Guarantees output over time, usually about 80% to 87% of rated power after 25 to 30 years. |
| Local presence | A South African office or distributor who handles claims. A long warranty is only useful if someone here honours it. |
| Tier 1 listing | A sign of a large, bankable manufacturer, not a quality rating. Useful as a filter, not a guarantee. |
| Fit with the inverter | The string voltage and current must sit within the inverter's PV input limits. |
Does the brand matter?
Less than most people think. Between reputable brands, output differences are small. Shading, orientation, tilt, cable sizing and workmanship affect your yield far more. A well-designed system with mid-range panels usually beats a poorly designed one with premium panels. Ask every installer to name the exact make and model on the quote; see what a solar quote should contain.
Are bifacial panels worth it?
Bifacial panels also collect light reflected onto their backs. On a pitched home roof the back sees little light, so the gain is small. They earn their keep on ground mounts and raised frames over light-coloured surfaces, such as on farms and flat commercial roofs.
How long do solar panels last?
Typically 25 to 30 years or more, losing roughly 0.4% to 0.5% of output a year. Inverters and batteries are usually replaced at least once in that time. Hail is the main local risk; see solar panel hail damage.
Do cheaper panels lose output faster?
Unbranded or grey-import panels can degrade faster and may have no one to claim against. The safeguard is the performance warranty and a local distributor, not the price alone.
Frequently Asked Questions
Are bifacial panels worth it?
Rarely on a pitched home roof. They make more sense on ground mounts and raised frames.
How long do solar panels last?
25 to 30 years or more, with output dropping slowly each year.
Do cheaper panels lose output faster?
Some do. Check the performance warranty and who honours it in South Africa.
Where We Fit In
CleanVolts matches homes, businesses and farms with vetted, registered CleanVolts Approved installers who name every panel, inverter and battery by make and model. We never buy or sell hardware, using CleanVolts costs you nothing, and if the installer pays us a referral fee, we tell you up front.
