About us
Three people in Top Ryde. Then nine years of rooftops.
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
We grew one roof at a time.
We started small — a three-person team working out of Top Ryde, quoting jobs by hand and installing them ourselves. There was no shortcut available to us, so we built the business the slow way: do the job properly, and let the customer tell the next one.
Nine years later we've expanded across Sydney and regional NSW, and the work has broadened from residential rooftops into commercial arrays, battery storage, off-grid systems and EV charging. What hasn't changed is who does the thinking on your system: we still size every array around the customer's actual usage, and we still monitor the systems we commission after we've been paid.
Solar is a fifteen-to-twenty-five year purchase. We'd rather be the company that's still answering the phone in year twelve.
Clean energy that anyone can actually buy.
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.
A leading force in Australia's energy transition.
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
Four things we won't compromise on.
Size it to the usage, not the roof
The biggest system that fits isn't automatically the best investment. We read your bill first and quote what pays.
Equipment we'd put on our own house
Tier 1 modules and inverters from Fronius, Sungrow and Solis — brands with real Australian support behind the warranty.
The price on the quote is the price
Rebates deducted up front, no surprise variations on install day, and no rebate quoted that you aren't eligible for.
We keep watching after handover
Every system we commission is monitored. If your output drops off a cliff, we'd like to notice before you do.
Equipment partners
What we install.
We're not tied to one manufacturer. We specify the equipment that suits the job.
475W Jinko Tiger NEO modules
High-efficiency panels with a 30-year linear output warranty.
Fronius & Sungrow inverters
Proven inverters with strong monitoring and local warranty support.
Tesla storage & charging
Powerwall 3 batteries and Wall Connector EV charging, supplied and installed.
Where we work
Greater Sydney, and well beyond it.
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
Nine years of experience, pointed at your roof.
Send through your last power bill and we'll come back with a fixed written quote.