Every consultation we run starts with undoing at least one of these myths. Some are harmless; others cause buyers to spend 20% more than they need to or walk away from solar that would have paid back in five years. Here are the ten we encounter most.
Myth 1: Solar doesn't work when it's cloudy
It works at reduced capacity — typically 20–40% of rated output on a heavily overcast day. You're still buying less from the grid. What matters is annual production, not performance on any single day.
Myth 2: Solar panels need direct sunlight to produce anything
Related to myth 1 but worth separating. Panels produce from diffuse light too — just less of it. This is why a panel under mild shade still produces something, and why cloudy regions with long daylight hours can still have decent solar economics.
Myth 3: Solar means zero electricity bills
Usually not. A well-sized grid-tied system typically offsets 60–90% of your annual consumption. Offsetting 100% requires either a larger system than your roof can fit, a battery, or accepting that you're over-producing during the day and buying back at night at a different rate.
Myth 4: Panels only last 10 years
Modern tier-1 panels carry 25-year performance warranties — typically guaranteed to produce at least 80–85% of their original rating after 25 years. Real-world performance is usually better. Inverters have shorter lives (10–12 years typically) and need to be budgeted as a mid-life replacement.
When someone quotes you a 25-year system payback, ask whether they've factored in an inverter replacement at year 10–12. A proper financial model shows it as a line item. A bad model hides it.
Myth 5: Solar panels are fragile
They're rated for significant hail impact, high wind loads, and sit outside for 25 years without complaint. What breaks panels is usually installation damage (people stepping on them) or catastrophic weather (large tree branches). In day-to-day terms, they're tougher than the roof under them.
Myth 6: You need to clean panels constantly
For most residential and commercial roofs, rainfall handles routine cleaning. In dusty or arid environments, scheduled cleaning (2–4 times a year) improves output noticeably. In monsoon climates, the opposite problem — you might want to clean less because the rain handles it.
Myth 7: Solar works during a blackout
A standard grid-tied system shuts off during a blackout for safety reasons — to prevent back-feeding power into the grid while utility workers are repairing it. If you want backup during outages, you need a hybrid inverter with battery storage, or an islanding-capable system with automatic transfer switch.
Myth 8: Batteries are essential
They're essential for some use cases (off-grid sites, frequent outages, specific tariff structures), optional for many others. In markets with reliable grid and favourable net-metering, batteries often don't pay back before their own end of life. Don't assume you need them.
Myth 9: Bigger is always better
Oversized systems that export huge surpluses at zero or near-zero compensation aren't automatically good. The right system size depends on your consumption pattern, your utility's export rules, and how much capex you want to commit. Sometimes a smaller system has better ROI.
Myth 10: All installers are basically the same
They aren't. Two systems with identical panel counts and identical kWp ratings can produce 20% different annual output because of design choices — inverter matching, cable sizing, string layout, mounting angle. The hardware is maybe 60% of the outcome. The design and installation quality is the other 40%.
The underlying pattern
Most of these myths exist because solar is often sold by people who are incentivised to make it sound simple. The reality is that solar is excellent technology with genuine nuance — and once you understand the nuance, the good-faith installers become easier to spot.