As the demand for home battery storage continues to grow, homeowners are faced with a wider range of options than ever before. At Solar Voltaics, we’ve helped hundreds of customers design and install energy systems tailored to their needs. Two of the most talked-about solutions in 2025 are the Tesla Powerwall 3 and the Sigenergy Sigenstor.
Both are excellent products with unique strengths, but which one is right for your home?
In this post, we’ll break down the key features, capabilities, and differences between the two, so you can make an informed choice about your residential energy setup.
Tesla Powerwall 3: The Familiar Favourite
Tesla’s Powerwall has long been a household name in battery storage. The latest version, Powerwall 3, features a sleek all-in-one design with a built-in inverter and increased power output. Tesla has also improved grid support capabilities and added compatibility with larger solar arrays.
Key Features:
- 13.5 kWh capacity (expandable with DC Expansion Packs of additional 13.5kWh capacity)
- 11.5 kW power output
- Integrated hybrid inverter
- App-based control via Tesla app
- Seamless backup functionality
- 10-year warranty
Sigenergy Sigenstor: The New Challenger
The Sigenstor, from tech-focused manufacturer Sigenergy, is a new all-in-one energy storage system that’s gaining serious traction. It integrates a hybrid inverter, modular battery system, and optional EV charger in a compact, stackable design.
Its modular format allows homeowners to expand storage over time, from 5 kWh up to 48 kWh, making it ideal for growing households or evolving energy needs.
Key Features:
- 5–48 kWh scalable capacity
- 5–12 kW hybrid inverter options
- Optional 12 kW EV charger
- Modular, stackable design
- IP66 weatherproof rating
- Intelligent app-based energy management
- 10-year warranty
Side-by-Side Comparison
Which One Should You Choose?
Choose Tesla Powerwall 3 if:
- You prefer a proven, established product from a major brand.
- You’re happy with a fixed capacity (13.5 kWh or 27kWh).
- You already use Tesla products like solar panels or vehicles.
Choose Sigenergy Sigenstor if:
- You want the flexibility to start small and expand over time.
- You’re looking for an integrated system that includes EV charging.
- You prefer a modular and space-saving design.
- You want advanced smart energy management built-in.
Our Verdict at Solar Voltaics
Both systems are excellent choices, and the best one depends on your specific needs. The Powerwall 3 continues to be a rock-solid option with Tesla’s well-known brand reliability, while the Sigenstor is an exciting new system offering greater flexibility and integration, especially for those considering EVs or wanting more control over their energy future.
We’re excited to now offer both solutions to our residential customers and are happy to walk you through the pros and cons based on your property, energy usage, and long-term goals.
Ready to Take the Next Step?
Get in touch with the team at Solar Voltaics today to book a survey or get a personalised quote. We’ll help you explore the best energy storage option for your home, whether that’s the tried-and-true Tesla Powerwall 3 or the innovative and modular Sigenergy Sigenstor.
