Energy storage, simplified. Modular LiFePO₄ home battery designed in New Zealand for reliable, scalable energy storage.
William is more than a battery, it's a platform. Designed from day one to grow with your energy needs.
Start with 16 kWh. Add modules to reach 80 kWh without replacing your existing system or rewiring.
Active cell balancing maintains consistent performance across all cells for longer life and stable output.
Designed and assembled in New Zealand. Local support, local parts, local accountability.
≥ 8,000 cycles with Grade A LiFePO₄ cells means decades of reliable daily cycling.
Base unit and expansion module, all the numbers you need to size your system.
| Base Unit Capacity | 16.07 kWh |
| Nominal Configuration | 51.2V / 314Ah |
| Max Configuration | 80.35 kWh (Core + 4× Expansion) |
| Cell Chemistry | LiFePO₄ Grade A |
| Cycle Life | ≥ 8,000 cycles |
| Warranty | 10 years |
| Weight (Base Unit) | 112 kg |
| Dimensions (Base) | 670 × 480 × 330 mm |
| Certifications | IEC62619:2022 · UN38.3 |
| Origin | Designed & assembled in New Zealand |
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Technical documents for the William battery system.
Get in touch and we'll put together a proposal tailored to your home and energy requirements.
