The Guwing Green Journal
Field notes on
clean energy.
Straight-talking, engineer-led writing on solar, batteries and energy efficiency. No jargon, no sales spin. Just the way we would explain it to a mate over the fence.
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Solar basics27 August 20269 min readHow Long Do Solar Panels Last? Lifespan, Degradation and What Affects It
Australian Government guidance puts the average panel lifespan at 20 to 30 years, but panels do not switch off on an anniversary. They fade. Here is what degradation actually is, why a 25-year performance warranty is not an expiry date, and which component usually fails first.
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For business18 August 202610 min readSolar for Apartment Buildings: A Guide for NSW Strata
Apartment solar is less about panels and more about who owns the roof, who has to approve it, and how the electricity gets shared. Here are the four configurations that work, what to settle before you propose anything, and the NSW grant that covers up to 80% of the cost.
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Design17 August 202614 min readGround Mounted Solar Panels: All You Need to Know
If your roof is heritage-listed, shaded, badly oriented or simply too small, a freestanding array is the alternative. Here is what ground mounting costs in NSW, the exempt development rules that decide whether you need council approval, and the wind engineering that keeps it standing.
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Solar basics15 August 202611 min readDisposal of Solar Panels: A Guide for the NSW Homeowner
Solar panels are classified as e-waste in NSW, so they cannot go in a council bin. Here is what disposal actually costs, where the EPA-backed recycling facilities are, and how to check whether your panels are genuinely finished first.
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Batteries13 August 202613 min readWhat Is an AC Coupled Battery? How It Works and What It Costs
An AC coupled battery is the standard way to add storage to solar you already own, without touching the original system. Here is how it works, what it costs in Sydney in 2026, and the NSW network rule that decides how big a battery inverter your home can take.
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Buying guide9 August 202613 min readSolar Panel Calculator: See Your Savings and Payback
A calculator gives you three numbers before you talk to anyone selling you a system. Here is which tools are worth using, the arithmetic behind the payback figure, and the four assumptions that make one calculator disagree with the next by years.
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Batteries8 August 202610 min readBest Virtual Power Plant (VPP) Providers in Australia
Two programs can advertise similar sign-up bonuses and still leave you thousands apart over ten years. Here are the VPP programs running as of August 2026, and the five things worth comparing before you sign anything.
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Batteries7 August 202612 min readWhat Is a VPP? Here's All You Need to Know
VPP turns up in battery quotes, network incentives and rebate paperwork, and it means two different things. Here is what a Virtual Power Plant actually does, what happens during a dispatch event, and how the NSW incentive is calculated.
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Batteries5 August 202611 min readSolar Battery Payback Period in Australia
Most Australian households recover a battery's cost in six to ten years, and in NSW a well-sized battery on a heavy evening user typically lands at seven to nine. Here is what actually moves that number, and the incentives that shorten it.
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