BLUETTI B500K1 5120Wh Expansion Battery, 5.12kWh LiFePO4 Module for Apex 300, AC300, and AC500 Home Backup Systems
Product Description
The BLUETTI B500K1 Expansion Battery (B500K) is a heavy-duty energy storage module designed for large-scale home backup and off-grid solar systems. Boasting a massive 5,120Wh capacity, it is the highest-density expansion module in the BLUETTI lineup, offering nearly double the storage of the standard B300 series in a single unit.
Equipped with premium LiFePO4 cells, the B500K1 is built for longevity with a lifespan of over 4,000 cycles. Its advanced "Next-Gen Design Architecture 2.0" features a wireless internal layout that minimizes cabling, improving both reliability and thermal efficiency. This model is specifically designed for semi-permanent or mobile setups, featuring mounting holes for wall/rack installation and compatibility with BLUETTI’s heavy-duty trolleys.
Key Features
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Massive 5.12kWh Capacity: A single unit provides enough energy to run critical home appliances (like a large refrigerator or well pump) for extended periods during an outage.
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High Scalability: Designed for ambitious setups. When paired with the Apex 300 or AC500 systems, you can chain multiple units together to reach a staggering 100kWh of total storage.
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Next-Gen Internal Architecture: The cable-free internal layout reduces failure points and makes the unit more compact and resilient to the vibrations of van life or travel.
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Superior Cold Resistance: Engineered to perform in harsh conditions, maintaining a stable discharge even in temperatures as low as -20°C.
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Universal Ecosystem Compatibility: Works seamlessly with the Apex 300, AC300, AC200L, and AC200MAX. It can also connect to the AC500 using a separate adapter cable.
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Direct DC Charging Hub: When used with the optional Hub D1 accessory, the B500K1 can serve as a high-capacity 700W DC power hub for RVs or off-grid cabins.
Technical Specifications
| Specification | Details |
| Battery Capacity | 5,120Wh (5.12kWh) |
| Battery Type | LiFePO4 (Lithium Iron Phosphate) |
| Life Cycles | 4,000+ Cycles to 80% Capacity |
| Max Charging Current | 65A |
| Max Discharge Current | 70A |
| Expansion Ports | 2 × 58.4VDC (90A Max) |
| Operating Temp (Discharge) | -20°C to 40°C |
| Operating Temp (Charge) | 0°C to 40°C |
| Weight | 45 kg |
| Dimensions (L×W×H) | 520 × 327 × 308.5 mm |
What’s in the Box?
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BLUETTI B500K1 Expansion Battery
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Battery Expansion Cable (P090A)
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User Manual & Warranty Card