Description
BLUETTI B300S Expansion Battery: Scalable Power for Any Environment
The BLUETTI B300S Expansion Battery is engineered to be the ultimate building block for your off-grid energy ecosystem. Designed as the perfect companion for the BLUETTI AC500 inverter, this 3,072Wh powerhouse allows you to scale your home backup or mobile power system to unprecedented levels. Whether you are preparing for severe power outages or living entirely off the grid, the B300S provides durable and reliable energy storage.
Beyond simply expanding the AC500, the B300S operates as an independent, standalone power station. Equipped with built-in DC outputs, it is fully capable of powering essential devices on its own, making it highly versatile for camping trips and outdoor applications.
Key Features
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Massive Capacity & Scalability: A single B300S module offers a robust 3,072Wh capacity. You can connect up to six B300S units to a single AC500 inverter, creating a massive 18,432Wh home backup system.
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Premium LiFePO4 Chemistry: Built with ultra-safe Lithium Iron Phosphate (LiFePO4) battery cells, the B300S is rated for over 3,500 charge cycles before reaching 80% of its original capacity.
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Self-Heating Technology: Uniquely designed for cold environments, the B300S features an automatic Temperature Adaptive Function. When connected to an input power source of at least 400W, the battery actively heats itself in sub-zero temperatures to ensure smooth charging and operation.
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Standalone DC Power: Leave the heavy inverter at home for short trips. The B300S features a 100W USB-C port, an 18W USB-A port, and a 12V/10A car outlet to directly charge laptops, smartphones, and DC appliances.
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Flexible & Fast Recharging: The battery accepts up to 500W of direct solar input thanks to its built-in MPPT controller. By combining inputs, the B300S can achieve a maximum charging rate of 1,000W (requires the optional D050S DC charging enhancer).
Technical Specifications
| Feature | Specification |
| Capacity | 3,072Wh |
| Battery Chemistry | LiFePO4 (3,500+ Cycles to 80%) |
| Standalone Outputs | 100W USB-C, 18W USB-A, 12V/10A Car Port |
| Max Solar Input | 500W (VOC 12-60VDC, 10A) |
| Max Combined Input | 1,000W (with optional D050S Enhancer) |
| Compatibility | BLUETTI AC500 (Primary) |
| Dimensions | 52 x 32 x 26.6 cm (20.5 x 12.5 x 10.5 in) |
| Weight | 36.1 kg (79.6 lbs) |






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