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Sizing Solar + Battery to Charge an EV at Home | Greenlight

  An electric car is often the single biggest new electricity load a home ever adds. It can quietly double your daily power use. So the question we hear constantly from EV owners across New South Wales and Queensland is a fair one: how much solar, and how big a battery, do I actually need to run the car on sunshine instead of grid power? The honest answer is that it depends on one thing above all else: when you charge. Charge in the middle of the day and you can run mostly on live solar with a smaller battery, or none at all. Charge overnight and the battery becomes the fuel tank, which changes the sizing completely. This guide from Greenlight Solar walks through the numbers, with real figures for NSW and QLD roofs, so you can work out what your own setup needs. Start with how much energy your EV really uses Charger power ratings (7kW, 11kW, 22kW) tell you how fast a car charges, not how much energy it needs. For sizing solar, the number that matters is kilowatt-hours (kWh), and it...
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AC-Coupled vs DC-Coupled Batteries Explained

  Once you have decided to add a battery to your solar system, one technical question decides how much of your solar you actually keep: should the battery be AC-coupled or DC-coupled? It sounds like installer jargon, and most homeowners glaze over when they hear it. But the choice affects how efficient your system is, what it costs, and how well it holds up in a blackout. At Greenlight Solar we install both across New South Wales and Queensland, on brand-new systems and as retrofits onto solar that has been on the roof for years. This guide explains the difference in plain terms, weighs up the real advantages and drawbacks of each, and shows you how to work out which one suits your home. First, the only bit of theory you need Three things in your home speak different electrical languages: Your solar panels generate direct current (DC). Your home and the grid run on alternating current (AC). Your battery stores energy as DC. An inverter is the translator that converts between D...
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Solar Farms in Australia

  A utility-scale solar farm in Australia currently costs between $1 million and $1.5 million per megawatt (MW) of installed capacity, with smaller or grid-constrained projects pushing towards $2–$3 million per MW . For a 100 MW project, that puts the total capital cost in the range of $100–150 million before land and financing. But the headline “per MW” figure hides a lot. What you actually pay depends on where the site sits, how far it is from a viable grid connection, how big the build is, and how long approvals take. This guide breaks the cost down component by component, shows what a farm costs at each size, and explains why, after years of falling prices, costs have started to plateau in current market conditions. We install commercial and ground-mount solar across New South Wales and Queensland, so the numbers here reflect what we see on real Australian projects, not overseas averages. How much does a solar farm cost in Australia? The working range for a utility-scale b...
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What Size Solar Battery Do I Actually Need? (10kWh vs 13kWh vs 20kWh)

  It is the question every homeowner asks, and it is the one most likely to get a vague answer. Bigger is not automatically better. A battery that sits half charged every night is money parked on your wall doing nothing, and an undersized one leaves you buying grid power at peak rates. The right size is the one that matches how your household actually uses electricity after the sun goes down. Here is how to work it out, what 10 kWh, 13 kWh, and 20 kWh each realistically cover, and why the changed 2026 rebate nudges most homes toward a particular size. Start with your overnight usage, not your total usage Your daily electricity use is not the number that matters. During the day, your solar panels are running the house directly. A battery only earns its keep from late afternoon through to the next morning, so the figure to find is how much power you use once solar stops producing. You can pull this from your electricity bill or your meter data. Most Australian homes use roughly 40 to...
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Best Solar Setup for Rouse Hill & Kellyville Homes

  Rouse Hill and Kellyville are not your average Sydney suburbs when it comes to power bills. The homes out here are large, mostly newer, and packed with the things that drive electricity use: ducted air conditioning, pools, big kitchens, home offices, and increasingly an EV in the garage. Summers in the Hills District get hot, and the air con runs hard through the evening, which is exactly when grid power is most expensive. That combination makes this one of the best parts of Sydney for solar and battery. Get the setup right and you can run most of that evening load off your own stored sunshine instead of buying it back at peak rates. Here is what a well matched system looks like for a typical home in these suburbs. Why these suburbs suit solar so well A few things about Rouse Hill and Kellyville homes push the numbers in favour of a solid system. The rooftops are generous. Newer detached homes here tend to have large, unshaded roof areas, often with sections facing several direct...
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Sigenergy vs Tesla vs Sungrow: 2026 Home Battery Comparison

  If you have been quoted on a home battery this year, chances are one of these three names came up: Sigenergy, Tesla, or Sungrow. They sit at the top of most Australian shortlists in 2026, and for good reason. All three use safe lithium iron phosphate (LFP) chemistry, all three carry a 10 year warranty, and all three work well in our climate. The catch is that they are built around very different ideas about what a battery should do, so the right pick depends far more on your home than on any “best battery” ranking. Here is a plain look at how the three stack up, and how the changed federal rebate should shape your decision. The short version Tesla Powerwall 3 is the polished, do it once option. Fixed 13.5 kWh, strong power output, excellent app, and easy to bolt onto an existing solar system. Sigenergy SigenStor is the flexible, future ready option. Modular, expandable, and the standout choice if you drive an EV or want to add one. Sungrow SBR and SBH are the value option. Mod...
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Tesla vs Sungrow Battery Storage: Which Is the Better Investment

  Battery storage has become one of the most talked-about additions to residential and commercial solar systems across Australia. As feed-in tariffs continue to shrink and grid electricity prices keep climbing, storing your own solar energy rather than selling it back cheaply to the grid is simply smart economics. But with so many battery options now available, choosing the right one can feel overwhelming. Two brands dominate the Australian battery storage market: Tesla and Sungrow . Tesla, with its globally recognised Powerwall, brings brand prestige and a seamlessly integrated ecosystem. Sungrow, the world’s largest inverter manufacturer, brings serious engineering credentials, competitive pricing, and rapidly growing market share. Both are excellent products but they suit different homeowners and different situations. At Greenlight Solar , we install and support both Tesla and Sungrow battery systems across Greater Sydney and NSW. This guide gives you an honest, detailed compa...
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