Two Popular Battery Choices to Maximize Your Federal Rebate

06 June, 2025.

With both brands offering cutting-edge features and impressive performance, making the choice can be overwhelming. Maybe you’ve heard about Tesla’s reputation, or perhaps you’re intrigued by Sigenergy’s features. But the endgame here is this: You need a battery that offers the best performance, flexibility, and value for your investment.

So, what are the differences between Sigenergy Sigenstor and Tesla Powerwall 3?

At Sunselect, we’ve helped countless businesses and homeowners understand their different choices when it comes to solar energy systems. We want you to get the right solution that will match your unique needs.

If you’re looking for the best balance of price, performance, and flexibility, we hope that this article can help you make an informed choice for your home or business.

Understanding the Role of Solar Battery Storage in Australian Homes

A home solar battery system stores unused solar energy generated during the day, so you can use it at night or during grid outages. In Australia, where electricity costs are high and blackouts are common, battery storage offers:

• Energy independence : Less reliance on the grid, more control
• Cost savings : Lower electricity bills by maximising self-consumption
• Backup power : Keep essential devices running when the grid fails
• Long-term flexibility : Expand, go off-grid, or charge an EV down the track

Installing solar battery storage is no longer a luxury, it’s a smart investment for long-term stability and sustainability.

Tesla VS Sigenergy: Brand & Product Maturity

Founded in July 2003, Tesla has grown into one of the most influential and innovative brands worldwide. Since the introduction of the Powerwall 1 in 2015, Tesla has remained at the forefront of home battery storage. The Powerwall 1 was followed by the Powerwall 2 in 2017, which has now evolved into the Powerwall 3, launched in late 2024. This new model is the first to feature a fully integrated hybrid inverter alongside its battery storage, offering a complete all-in-one solution.

With over 10 years of battery manufacturing expertise, the Powerwall 3 is a highly refined, mature product that reflects Tesla’s continuous innovation and industry experience. This is further validated by the fact that to date, we have not encountered any remedial issues with Tesla installations. The product’s evolution is evident, and thanks to the scale and sophistication of Tesla’s systems, any faults are detected and resolved remotely, ensuring a reliable performance and peace of mind for customers.

In contrast, although Sigenergy was founded in 2022, it has quickly emerged as a formidable competitor in the energy storage market. Led by Tony Zuu, former president of Huawei’s Fusion Solar division, Sigenergy achieved the shortest time on record to reach US$100 million in annual sales. As a rapidly growing company, Sigenergy has swiftly earned a reputation as a trusted and innovative partner in the industry.

Smart Features

Sigen AI

One of Sigenergy’s standout features is its use of AI-driven optimisation to enhance efficiency and reduce energy costs. By integrating a cloud-native approach with machine learning capabilities, Sigenergy creates a self-evolving system that intelligently adapts to maximise performance.

Sigen AI continuously learns from user behaviour, refining its ability to predict and optimise electricity usage over time. This adaptive intelligence enables the system to respond to dynamic tariff structures, helping homeowners and businesses maximise savings and efficiency effortlessly. Although currently a free feature, there is no possibility of ruling out it will soon become part of a paid subscription plan.

Tesla’s Storm Watch

Tesla’s Storm Watch ensures your Powerwall 3 is always prepared for unexpected power outages by automatically charging to full capacity when a severe weather event is detected. This proactive feature maximises your home’s backup protection, ensuring you have enough stored energy when you need it most. Storm Watch is only activated in response to severe local weather alerts, making it particularly beneficial for those living in storm-prone or extreme weather regions.

Performance Face-Off: Tesla Powerwall 3 vs. Sigenergy SigenStor Battery

Capacity and Expansion

The Powerwall 3 comes with a fixed 13.5 kWh, expandable by adding more units. In contrast, the Sigenergy SigenStor Battery allows you to build your system over time, starting small and scaling up to 48 kWh per stack.

Winner: Sigenergy SigenStor Battery for flexibility and futureproofing.

Output and Efficiency

The Tesla Powerwall 3 delivers higher output, ideal for households with heavy loads. However, Sigenergy edges ahead in efficiency, meaning less energy is lost during storage.

Winner: Tesla Powerwall 3 for output, SigenStor for efficiency.

Integration and Compatibility

Tesla’s closed ecosystem works best for homes with Tesla solar gear. The SigenStor, however, is inverter-agnostic and supports AC/DC coupling, making it a versatile choice for most solar panel systems with battery integration.

Winner: Sigenergy SigenStor Battery

Backup Power Capability

The Powerwall 3 supports single-phase backup, but Sigenergy offers full three-phase, giving better load balancing and performance across large properties.

Winner: Sigenergy SigenStor Battery

Quick Comparison of Tesla Powerwall 3 and Sigenergy SigenStor Battery

Feature	Tesla Powerwall 3	Sigenergy SigenStor
Usable Capacity	13.5 kWh	5.2 kWh (5 kWh module), 7.8 kWh (8 kWh module)
Maximum Storage Capacity	216 kWh	48 kWh per stack, up to 240 kWh (single-phase), 2.4 MWh (three-phase)
Battery Chemistry	Lithium Ferro Phosphate (LFP)	Lithium Ferro Phosphate (LFP)
Charge Rate	5 kW standard	2.5 kW (5 kWh module), 4 kW (8 kWh module)
Maximum Charge Rate	8 kW	12 kW (inverter dependent)
Peak Output Power	170% of rated capacity	200% of rated capacity
Integrated Inverter	Yes (11.04 kW hybrid inverter)	Yes, various inverter options
Adjustable Inverter Settings	Yes (3.68 kW - 10 kW)	No (requires new inverter for upgrades)
Maximum Solar Input	Up to 20 kW	Up to 30 kW
Backup Power Support	Yes (Gateway 2 included)	Optional Backup Gateway
EV Charging Support	No integrated EVCP	Yes (V2H/V2G-ready)
Warranty (Battery)	10 years (unlimited cycles, 80% capacity retention)	10 years (70% capacity retention)
Warranty (Extended)	Not available	15 years (60% capacity retention, additional cost)
Temperature Operating Range	-20 to 50°C	-20 to 50°C
Weight	130 kg	18 kg - 456 kg (stack configuration dependent)
Dimensions	H 1150 mm x W 753 mm x D 147 mm	H 370 mm - 1990 mm x W 700 mm x D 260 mm (stack configuration dependent)
IP Rating	IP67	IP66

Powerwall vs. SigenStor: Final Considerations

Powerwall 3

• Fixed storage capacity of 13.5kWh
• Designed to work best in Tesla’s ecosystem but can also be integrated with non-Tesla solar systems
• Best suited for single-phase homes, with limited support for three-phase setups and can only back up a single phase.

SigenStor

• Modular design with a starting capacity of 8kWh, expandable up to 48kWh per stack of six
• Available in both single-phase and three-phase configurations, making it more flexible
• Offers full three-phase backup, making it ideal for homes with large appliances that require balanced power distribution.

Powerwall 3 and SigenStor are strong home energy solutions, but they serve different needs. Powerwall 3 is best for simple, all-in-one installations on single-phase homes, while SigenStor offers more flexibility, scalability, and backup power options for single or three-phase homes.

At Sunselect, we install both energy systems. When it comes to determining which system is right for you, we’re here to help. We customise solar systems every day to suit your unique energy needs and goals.

Reach Out to SunSelect at 1300 867 353 for Expert Guidance and Money-Saving Options.
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