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 basics14 July 202612 min readSolar Panel Maintenance: What You Actually Need to Do
Solar panels are low-maintenance, but low isn't none. Here is what maintenance actually involves, how often your system truly needs it, which checks you can safely do yourself, and when to call in a licensed professional.
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Rebates12 July 202611 min readSTC Rebate Explained: How Much You'll Save in NSW
The "STC rebate" is usually the biggest single deduction on a solar quote, stripping thousands off the final price. Here is exactly how the incentive is calculated for Sydney homes in 2026, and how to check the figure your installer has quoted.
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Rebates10 July 20267 min readEverything You Need to Know About Green Loans in Australia
Solar panels, battery storage and EV chargers often require a significant upfront investment. Green loans are designed specifically for sustainable home improvements, and can make renewable energy more affordable while lowering your long-term energy bills.
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Rebates7 July 202613 min readNSW Home Energy Saver Program: What It Means for Sydney Homeowners
The new NSW Home Energy Saver Program removes the upfront cost barrier to solar, batteries and energy upgrades: a zero-interest loan of up to $15,000, with a $4,000 discount option coming soon. Here is how it works, what qualifies, and how the incentives stack.
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Buying guide5 July 202612 min readWhat Size Solar System Do I Need? A Complete Guide
Most solar sizing advice is either a generic national formula that ignores where you live, or an installer's quote sized to whatever fits your roof. Here is how to work out the right size for your Sydney property, and how to check any quote against your usage, your network's export rules, and where your energy needs are heading.
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EV charging3 July 20267 min readAvailable V2G EV Chargers in Australia Compared
Vehicle-to-grid (V2G) is no longer just a future concept, it is already being trialled and rolled out across parts of Australia. But not every EV charger supports it. This guide breaks down the V2G chargers currently available, how they compare, and what to consider before buying.
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EV charging1 July 20265 min readWhat Is Bidirectional Charging?
A lot of EV owners assume bidirectional charging just means a faster or smarter way to charge their car. But that is not really what it does. A bidirectional charger changes the direction electricity can flow, so your EV can power your home, store solar, or even send electricity back to the grid.
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Rebates28 June 202611 min readWhat Is the Cheaper Home Batteries Program? (And What Changed in 2026)
The federal Cheaper Home Batteries Program gives households a 25–30% discount on battery storage. How the rebate is calculated, what changed on 1 May 2026, and how it stacks with the NSW VPP incentive.
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Buying guide27 June 202612 min readHow Much Does a 10kW Solar System Cost? (And Is It Worth It?)
A 10kW solar system in Sydney typically costs $8,000–$14,000 fully installed after the federal STC rebate. A breakdown of real 2026 pricing, daily generation, NSW network export rules, and whether 10kW is the right size for your home.
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