About us
Sinvesta Group — Solar Investment Australia Pty Ltd — was founded in 2016 by Dr. Phong Vo with a straightforward idea: make clean energy simple, affordable and genuinely accessible to Australian households.
Our story
Sinvesta was founded in 2016 by Dr Phong Vo in Top Ryde. Today it is a full-service solar and storage company, now based in Castle Hill, with dedicated teams for system design, engineering, installation, commercial projects and after-sales support, all led by Phong.
More than 2,500 projects and 4,000 clients later, we deliver everything from family rooftops to commercial arrays, battery storage, off-grid systems and EV charging across Sydney and regional NSW. Every job has its own people behind it: a designer who sizes the system around your actual usage, accredited installers who build it, and a support team that keeps monitoring it long after handover.
Under Phong's leadership the standard hasn't changed as we've grown. Solar is a fifteen-to-twenty-five year purchase, and we intend to be the company that's still answering the phone in year twelve.
Leadership
Founder & Principal Clean Energy Engineer
Phong founded Sinvesta in 2016 and still leads it hands-on. He brings engineering depth to every residential and commercial project, sizes systems around how each customer actually uses power, and meets many of them personally to explain the options before anything is installed.
“Phong took the time to explain the process and selection of quality product used.”
maria le, Google review
To make clean energy simple, affordable and accessible for every Australian home and business — through quality solar, battery and EV charging solutions that are sized honestly and installed well.
To empower communities with sustainable, reliable energy — and to help move Australia's grid toward something cleaner than the one we inherited.
How we work
The biggest system that fits isn't automatically the best investment. We read your bill first and quote what pays.
Tier 1 modules and inverters from Fronius, Sungrow and Solis — brands with real Australian support behind the warranty.
Rebates deducted up front, no surprise variations on install day, and no rebate quoted that you aren't eligible for.
Every system we commission is monitored. If your output drops off a cliff, we'd like to notice before you do.
Equipment partners
The products at the heart of our systems, installed by our own teams. We're not tied to one manufacturer, so we still specify whatever suits the job.
Home batteryThe battery most of our customers choose, with an integrated solar inverter and whole-home backup.
Modular batteryStackable 9 kWh modules on a 10 kW hybrid inverter. Start where your budget is and add capacity later.
Solar panelsHigh-efficiency panels for homes and commercial roofs, sized around your actual usage.
EV chargingHome EV charging set up to use your daytime solar surplus, with the switchboard work done by our electricians.
Where we work
We're based at Castle Hill in the Hills District and install right across greater Sydney — the north-west, the Hills, the north shore, the inner west, the eastern suburbs, the south and the greater west — plus much of regional NSW for commercial work.
If you're not sure whether we reach you, just call and ask. It's a quick answer.
Let's talk
Send through your last power bill and we'll come back with a fixed written quote.
Sydney spring 2026
Store your sunshine
before the rebate drops.
The federal battery rebate steps down again on 1 January 2027.
Complimentary assessment
Get your
free quote
Provide a few details and our team will design a solar and battery system tailored to your energy usage.
Submit request
No obligation · rebates taken off upfront · opens your email app to send
