Batteries
Alpha Smile B3 Plus
Alpha ESS batteries are expandable from 5.04 kWh – 30.24 kWh
Bigger Power. Smarter Storage. Built for the Modern Australian Home.
The Alpha ESS Smile B3 Plus is the next evolution in home energy storage. A powerful, modular battery designed to help Australian homeowners make the most of their solar power.
Building on the success of the original Smile B3, the Plus model offers higher storage capacity, longer runtime, and more flexibility for growing households or homes with heavier power use.
If you want to lower your electricity bills, use more of your own solar energy, and gain peace of mind during blackouts, the Smile B3 Plus makes it simple and reliable. All without the jargon or hassle.
Works with Your Existing Solar System
The Smile B3 Plus is AC-coupled and retrofit-ready. Meaning, it can connect directly to your existing solar setup without replacing your inverter or panels.
That means an easier, faster, and more affordable installation. Perfect for anyone who already has solar and wants to add battery storage for better control and savings.
Power That Fits the Way You Live
The Smile B3 Plus delivers up to 3 kilowatts (kW) of continuous power, ideal for running everyday essentials such as:
- Fridges and freezers
- Lighting and Wi-Fi
- TVs, computers, and smaller appliances
That's enough to comfortably power the heart of your home through the evening or during a blackout.
However, like the standard Smile B3, the system is designed to handle essential loads, not heavy-demand appliances. So while it will keep your household running smoothly, large systems like ducted air-conditioning, ovens, dryers, or EV chargers will still draw from the grid when needed.
It's a smart, balanced way to stay powered…covering what matters most, when it matters most!
Simple Installation and Smart Monitoring
Installation is straightforward. The system's all-in-one design keeps everything neat and tidy, and once connected, you can track performance from anywhere using the Alpha ESS app.
You'll see:
- How much solar you're generating
- How full your battery is
- When your home is drawing from the grid
It's real-time visibility that helps you make smarter decisions and keep your bills low.
Warranty and Peace of Mind
When you invest in the Alpha ESS Smile B3 Plus, you're protected by one of the most comprehensive warranty programs in the industry.
- 5-Year Product Warranty- Covers the system's hardware and workmanship, ensuring all components are built to last and perform as intended.
- 10-Year Battery Performance Warranty (Backed by Munich Re) - Guarantees your battery will retain at least 80% of its original usable capacity for up to 10 years (120 months).
This performance guarantee, supported by Munich Re, a global leader in warranty reinsurance, means your battery's performance promise is not just from Alpha ESS. It's financially secured by one of the most reliable names in the world.
Additional terms and conditions apply; see Alpha ESS warranty documentation for full details.
How Long the Alpha Smile B3 Plus Can Power Your Home
| Battery Size | Capacity | Approx. Runtime (at 3 kW output) |
|---|---|---|
| 1 module | 5.04 kWh | ≈ 1 hour 41 minutes |
| 2 modules | 10.08 kWh | ≈ 3 hours 21 minutes |
| 3 modules | 15.12 kWh | ≈ 5 hours 2 minutes |
| 4 modules | 20.16 kWh | ≈ 6 hours 43 minutes |
| 5 modules | 25.2 kWh | ≈ 8 hours 24 minutes |
| 6 modules (max capacity) | 30.24 kWh | ≈ 10 hours 5 minutes |
These figures assume continuous use at a steady 3 kW load. In real-life conditions, your runtime will typically be longer, since most homes don't draw the full 3 kW at once. The Smile B3 Plus automatically manages power efficiently — extending runtime while keeping your essential appliances powered safely and reliably.
Quick Benefits
AC Coupled
Expandable from 5.04–30.24 kWh
Backup with UPS (optional)
Easy Install & Low Maintenance
24/7 Monitoring
Virtual Power Plant (VPP) Ready
Alpha Cloud
- Built on the Microsoft Azure cloud server
- Real-time monitoring anywhere with web and mobile apps
- Remote control of system for maximum savings
Alpha ESS SMILE-B3-PLUS Specifications
| Specification | Details |
|---|---|
| Model | SMILE-B3-PLUS |
| Type | AC-coupled single-phase energy storage system |
| Max. AC Output Power | 3 kW |
| Capacity Range | 5.04 – 30.24 kWh |
| Max. Charging / Discharging Current | 60 A |
| Depth of Discharge (DoD) | 95 % |
| Battery Chemistry | LFP (LiFePO₄) |
| Usable Capacity (Per Module) | ~4.8 kWh |
| Expandable Capacity | Up to 6 modules (≈ 30.24 kWh total) |
| Nominal Voltage (Per Module) | ~48 V |
| Round-Trip Efficiency | ≥ 92 % |
| Cycle Life (@ 25 °C, 0.5 C) | ≥ 8 000 cycles |
| Operating Temperature Range | −10 °C ~ 50 °C |
| Storage Temperature | −20 °C ~ 60 °C |
| Relative Humidity | 0 % – 90 % (non-condensing) |
| Dimensions (W × D × H) | 640 × 250 × 725 mm |
| Weight | ≈ 75 – 80 kg (depending on configuration) |
| IP Protection Rating | IP65 (Outdoor) / IP21 (Indoor) |
| System Response Time | < 10 ms |
| Communication Interfaces | RS485 / CAN / Wi-Fi / Ethernet |
| Monitoring Platform | AlphaCloud / AlphaESS App |
| Certifications & Standards | IEC 62619 (Battery), IEC 62109 (Safety), CE, UN 38.3 |
| Product Warranty | 5 Years |
| Battery Performance Warranty | 10 Years (≥ 80 % capacity retention) |
CEC Approved Solar Battery
What's New in the “Plus”
While the standard Smile B3 is ideal for smaller homes and everyday savings, the Smile B3 Plus takes it further with:
Bigger & Better Energy Storage
The Plus offers a massive 5.04 kWh to 30.24 kWh capacity range, compared to 2.9-17.2 kWh in the original model. That means nearly double the potential storage-perfect for families, homes with air-conditioning, or anyone who uses more power after sunset. With this expanded range, the Smile B3 Plus can store enough energy to keep your home running comfortably through the night, and in many cases, through cloudy days too.
Improved Expandable Design
The Smile B3 Plus can scale up to 10 battery modules, giving you plenty of room to grow. Whether you’re planning to add an EV charger, upgrade your appliances, or run a pool pump or electric hot water system, you’ll have the storage to support it. This modular flexibility makes the Smile B3 Plus a smart long-term investment that grows with your household.
Improved Efficiency, Same Trusted Reliability
The Plus model maintains a 95% Depth of Discharge (DoD), meaning you can safely use almost all the energy you store. It also offers the same 60-amp charge/discharge rate, allowing fast charging from your solar panels and efficient use at night.
Slightly Larger, Still Compact
Even with its increased capacity, the Smile B3 Plus remains a tidy, space-efficient system at 640 × 250 × 725 mm. It’s sleek enough for indoor or outdoor installation and built tough with IP65 weather protection, ensuring reliable performance in Australian conditions.
Built for Australian Conditions & Installed Nationwide
Whether you live in the heat of Queensland, the dry inland, or the cooler southern states, the Alpha ESS Smile B3 Plus is engineered to perform reliably in every Australian environment.
With an operating temperature range of -10°C to 50°C, it continues to deliver consistent performance through extreme heat, cold, and humidity.
Its IP65-rated weather protection keeps it safe from dust, rain, and moisture, making it suitable for both indoor and outdoor installation.
And because Solar Battery Group offers professional installation Australia-wide, you can enjoy expert setup and support wherever you’re located; ensuring your system is configured for your home, your climate, and your lifestyle.
About AlphaESS: the Manufacturers
AlphaESS is one of the leading energy storage solution and service providers in the world. The company specialises in the residential and commercial market, aiming to deliver the most cost-effective and fit-for-purpose solutions.
AlphaESS has 10+ subsidiaries providing local services and 40000+ systems actively running in over 50 countries, enabling millions of people to live with reliable, accessible and clean energy.
Other Alpha ESS Batteries
Alpha Smile 5 10.1
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Alpha Smile 5 13.3
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Alpha Smile T10 HV
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Alpha Smile G3
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Alpha Smile G2 B5
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Alpha Smile M5
View detailsFrequently asked questions
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