Solar and battery technology has been around long enough, and marketed loudly enough, that a set of persistent myths has built up — some outdated, some oversimplified, some just wrong. Here's the technically accurate answer behind the most common claims, checked against the actual physics and current NSW economics.
<div class="tldr" style="border:1px solid #cbd5e1;background:#f8fafc;padding:16px 20px;border-radius:8px;margin:24px 0;"> <strong>Quick answer</strong> <ul> <li>Panels work under cloud — typically 10–25% of rated output on heavy overcast.</li> <li>Rainfall does most panel cleaning for typical Sydney roofs.</li> <li>Batteries aren't "not worth it" — 2026 rebates and falling feed-in tariffs have shifted the maths.</li> <li>North isn't the only viable orientation; east/west lose only ~15–20% and can suit time-of-use pricing.</li> <li>Panels degrade gradually (~0.4–0.5%/year), not off a cliff.</li> </ul> <em>Updated August 2026 for NSW residents.</em> </div>
This confuses "reduced output" with "no output." As explained on our photovoltaic effect page, cells respond to photons striking the silicon, not to direct beam sunlight specifically or heat. Clouds scatter and diffuse light rather than fully blocking it, so panels keep generating on overcast days — typically in the 10–25% range of rated output under heavy cloud, and considerably higher under light or patchy cloud. Panels also generally perform slightly less efficiently on very hot, cloudless days than on cool, bright ones, since silicon's output declines marginally as cell temperature rises.
Dust and grime do reduce output by blocking photons — but for the vast majority of Australian homes, rainfall does the bulk of this cleaning naturally. Panels are tilted, glass-surfaced and designed to shed water and loose debris. Field data generally puts output loss from moderate soiling, absent unusual circumstances, at a small single-digit percentage between rain events — rarely enough to justify frequent professional cleaning for a typical suburban roof. The exceptions are genuine: homes near unsealed roads, under trees with heavy bird activity, in low-rainfall inland regions, or near certain industrial or agricultural dust sources may see meaningfully higher soiling losses.
This claim has aged out of accuracy faster than most people have updated their assumption. Two things have shifted the maths as of 2026: stacked federal and NSW battery incentives currently cutting upfront battery costs by roughly 30–40% when combined, and NSW feed-in tariffs sliding toward roughly 3–4c/kWh from 1 July 2026. That combination increases the value of storing your own solar rather than exporting it for a shrinking credit, and reduces the upfront cost of the equipment that lets you do it. Add potential Virtual Power Plant earnings, and the payback for a well-sized battery under current NSW conditions is materially shorter than even two or three years ago.
Whether a battery is "worth it" always depends on individual usage patterns and tariff structure — but the blanket claim that batteries generally aren't worthwhile is no longer an accurate default. (Rebate figures step down on a set schedule — confirm current values via the Clean Energy Regulator and NSW Government energy before committing.)
North-facing arrays capture the most total annual sunlight in the Southern Hemisphere and remain the benchmark — but "only" is doing far too much work. East- and west-facing panels typically produce around 15–20% less total annual energy than an equivalent north-facing array, not a catastrophic shortfall, and they generate at different times of day. Under time-of-use tariffs, a west-facing array can actually align better with the evening peak pricing window than a north-facing one — so orientation increasingly depends on your tariff and usage, not purely on maximising total kWh.
Panels don't have a cliff-edge failure point — they degrade gradually. Manufacturers typically warrant around 0.4–0.5% output degradation per year for quality monocrystalline panels, meaning a panel might still produce around 87–90% of its original rated output after 25 years, not zero. The physical components are engineered for multi-decade exposure, and the main practical failure points tend to be individual component issues rather than wholesale panel death. (See Solar Panel Degradation Explained.)
Panel front glass is tempered and tested against defined hail-impact standards (ice balls of a specified size and velocity under international certification). Genuine hail damage to correctly certified, properly installed panels is uncommon outside severe, unusually large hailstone events. It happens, but it's the exception, not the baseline risk to plan around.
More capacity sounds like an unambiguous good, but a battery sized well beyond what your solar array can charge in a day, or beyond what your evening usage can discharge, sits partially unused — capital tied up in capacity that rarely gets cycled. Matching battery size to your actual solar generation profile and household consumption pattern generally delivers better financial returns than simply buying the largest unit.
Almost every myth here comes from a kernel of outdated or overgeneralised truth, stretched further than the underlying physics or economics support. The useful approach is checking claims against your own roof, usage pattern, and current tariff and rebate conditions — which, given how much the numbers have shifted through 2025 and into 2026, is worth doing properly rather than relying on advice a few years out of date.
Yes. Output is lower due to shorter days and a lower sun angle, but panels generate year-round; cool, bright winter days can even be efficient per hour of sun.
For many households, increasingly yes — stacked rebates cutting upfront cost by roughly 30–40% and low feed-in tariffs both favour storing solar over exporting it. It still depends on your usage and tariff, so run your own numbers.
Get an accurate, myth-free assessment of what solar and battery technology would actually do on your home — compare the numbers with Blue Energy Solar, or call 0421 458 217.
