Residential and commercial solar, battery storage and EV charging — designed,
installed and monitored by the team that has completed 2,500 projects across Sydney.
Sinvesta was founded in 2016 by Dr Phong Vo in Top Ryde. Today we design and
install across Sydney and regional NSW — and we still monitor every system we commission.
9Years in business
4,000+Satisfied clients
2,500+Projects completed
30yrPanel output warranty
We install and stand behind
Solar packages
Sized to your roof, your bill and your plans.
Our most-fitted sizes. We confirm yours after a look at your usage.
Residential
6.6kW
+ 13.5kWh battery
Small to medium homes
The Australian standard, now with storage. Daytime surplus charges the battery instead of being exported for a few cents.
Without storage, most of your solar goes to the grid for about 5c and comes back at 35c.
A battery flips that — you use your own power at night, and you keep the lights on in a blackout.
Tesla Powerwall 3 — 13.5 kWh
The one most of our customers choose. Integrated inverter, whole-home backup, and the app people actually like using.
Sungrow — 20 to 50 kWh
Stackable lithium-ion for homes with heavy loads, and for commercial sites that need serious capacity.
SigEnergy — 18 to 48 kWh
Modular and scalable. Start where your budget is and add capacity as your needs grow.
Off-grid systems
For properties with no mains connection, or where a grid upgrade costs more than going independent.
Every system we commission comes with online monitoring. You can watch production
against consumption in real time, check yesterday, or pull up the year.
The Sigenergy app draws your home in 3D and shows solar, battery, home, EV chargers and
grid live, with the battery level and operating mode underneath.
If something ever looks wrong, we can see it too — and we'll call you.
93.7%Of supply from solar, one SigenStor day
45.6kWh of solar that day
Screen shown: the Sigenergy app. Figures are from one day on a SigenStor system (29 September 2026).
How it works
Four steps, no surprises.
Talk it through
Call or send your last bill. We look at what you use, when you use it, and what your roof can take.
Design & quote
A fixed written quote with the exact panels, inverter and layout — plus the rebates you qualify for, already deducted.
Install
CEC-accredited installers, usually one day for a residential system. We handle the grid application and paperwork.
Switch on & monitor
We commission the system, set up your app, and keep an eye on performance from our end.
Recent work
Real roofs across Sydney.
Every photo below is a Sinvesta installation — not a stock image.
I was completely impressed with Phong and his team professionalism and customer service. Phong took the time to explain the process and selection of quality product used. I highly recommend this business. Thanks Phong and team for a great job well done!
DDarren ToLocal Guide · 10 reviews
3 months ago
VERY HAPPY with my new solar and battery SYSTEM organised by Phong and installed by his team. “Excellent experience from start to finish. The team was professional, friendly, and clearly knew what they were doing. They kept the site clean throughout the install and left everything tidy once finished. The whole setup was well organised, with clear communication at every step. The monitoring app is quick and easy to use, making it simple to track our solar and battery performance. Highly recommend this team to anyone considering solar.”
RRudy Lin2 reviews
3 months ago
Five stars! We recently had Solar Investment Australia install a complete solar panel and battery system at our home, and the experience was flawless. From the initial consultation to the final installation, Phong was professional, knowledgeable, and highly efficient. He took the time to explain the system components and helped us choose the best setup for our energy needs. The installation was neat, completed on time, and they left the site spotless. Highly recommend them for anyone looking to switch to solar!
Kkim loan ly3 reviews
10 months ago
I had a fantastic experience getting my solar battery installed. The whole process was smooth from start to finish. The team was punctual, polite, and very knowledgeable. They made sure I understood how the battery works, the monitoring app, and what to expect with my energy savings. The installation was neat and tidy, and the system has been performing better than expected. Excellent service and great value—highly recommended to anyone thinking about adding a battery to their solar system!
Mmochi bear9 reviews · 10 photos
a year ago
I just had 10kW solar panels installed yesterday. Phong and his team did an amazing job. Workmanship was exceptional. Not a single tile was broken. The job was completed within 4 hours. Phong made the whole experience easy. Everything was explained in details. The entire process from our initial call to the installation took less than 2 weeks. He’s incredibly professional and knowledgeable in this field. Thanks for your outstanding service and pricing. I highly recommend Solar Investment Australia to anyone opting for solar.
PPham Truong Son Vo3 reviews · 1 photo
a year ago
I had an amazing experience with my solar system installation. Everything went smoothly from start to finish, and the system is performing exactly as promised. A special thanks to Phong - he is an outstanding salesman! He was professional, …
TTien PhamLocal Guide · 14 reviews · 6 photos
a year ago
Got my solar panels and battery installed today, everything runs smoothly. Phong has been extremely helpful, instantly answered all my questions make it so easy to pick the right system for myself. Highly recommended.
CCulburra Beach2 reviews · 2 photos
a year ago
The whole process from obtaining the initial quote, modifying the plan and then install was perfect. Dealing with Phong was great. Going through SINVESTA has saved me around $2000 when compared to my local installer for a 13kw system. Very happy and highly recommend!
VViet Anh3 reviews · 2 photos
a year ago
Phong installed a new 6.6kW solar system on my roof. From the initial consultation through to completion, I was thoroughly impressed by his professionalism, knowledge and enthusiasm. His team worked efficiently, ensuring minimal disruption to my daily routine. As we’re new to solar, Phong ensured the panels and system work perfectly and guided us every step of the way. He even advised and helped us claim a solar rebate from our council which we didn’t even know existed. Absolutely recommended!
Reviews from our Google Business Profile
Questions
The things people ask us first.
How much will I actually save?
It depends on how much power you use during daylight hours. A household that runs air-conditioning, a pool pump or works from home will save far more than one that's empty until 6pm. The estimator above will give you a realistic range; a proper quote after we've seen your bill will give you a number you can rely on.
What rebates can I get in NSW?
Most systems qualify for federal STCs, which we deduct from your quoted price up front so you never pay it and claim it back. Battery incentives change from year to year — we'll tell you exactly what applies on the day we quote you, and we won't quote a rebate you aren't eligible for.
How long does an install take?
A standard residential system is usually a single day on site. Commercial systems run longer and we stage them around your operating hours. Grid connection approval can add time before or after — we manage that application for you.
What warranty comes with it?
Our panels carry a 30-year linear output warranty. Inverters and batteries carry their manufacturer's warranty — Fronius, Sungrow, Solis and Tesla all have Australian support. Our workmanship is warranted separately, and because we monitor your system we often spot a fault before you do.
Can I add a battery later?
Yes. We wire residential systems battery-ready so adding storage later is straightforward. If a battery is likely within a couple of years, tell us at quote time and we'll pick an inverter that makes the upgrade cheaper.
Do you offer finance?
Yes — we work with lending partners so you can spread the cost. We'll walk you through the options at quote stage. Sinvesta is not a credit provider and we don't give financial advice; the terms come from the lender.
Which suburbs do you cover?
All of greater Sydney — we're based at Castle Hill in the Hills District — plus much of regional NSW. If you're not sure, call and ask.
Free, no obligation
Find out what your roof is worth.
Send us your last power bill and we'll come back with a fixed written quote — the right system size, the real output, and the rebate already taken off.
