The Bluetti AC500 + B300K combo is one of Bluetti’s most powerful home backup and off-grid energy solutions. Designed for flexibility, it pairs the AC500 inverter module with the B300K expansion battery, giving users scalable capacity and serious output power. Based on product manuals and Bluetti’s official specifications, this guide breaks down performance, features, charging options, pros and cons, and best-use scenarios.
Product Overview Table
| Feature | Specification |
|---|---|
| Battery Capacity | 2,764.8Wh per B300K (expandable to 16,588.8Wh with 6 units) |
| Inverter Power | 5,000W continuous, 10,000W surge (AC500) |
| Battery Type | LiFePO4 (LFP) |
| Cycle Life | Not stated in manual |
| Weight | 65 lbs per B300K |
| Dimensions | 20.67 × 12.87 × 8.23 in (B300K) |
| Solar Input | Up to 3,000W (AC500 with MPPT) |
| UPS Switchover | 0 ms seamless UPS with correct setup |
| Warranty | Not stated in manual |
Performance
The AC500 inverter provides up to 5,000W of pure sine wave output, with a surge capacity of 10,000W. This is strong enough to power large household appliances like refrigerators, well pumps, and even air conditioning units. When combined with multiple B300K modules, users can scale energy reserves to cover multi-day outages or off-grid cabins.
Battery & Specs
Each B300K battery module offers 2,764.8Wh of LiFePO4 storage. Up to six units can be connected, reaching a massive 16.6kWh capacity. LiFePO4 chemistry ensures stability, safety, and long service life. While the manual doesn’t list cycle-life ratings, LFP batteries typically support thousands of charge cycles.
Portability & Design
At about 65 lbs each, the B300K batteries are heavy but manageable with two people or a cart. Bluetti designed the system more for stationary home backup than lightweight portability. Each module includes handles and stackable housing for secure installation.
Charging Options
The AC500 supports flexible charging methods, including:
- AC charging (standard or turbo up to 50A input)
- Solar charging with up to 3,000W via MPPT input
- Car charging (slower, suitable for emergencies)
- Pass-through charging is supported, allowing simultaneous charge and discharge
A key advantage: the B300K can recharge from 5% to 80% in about 45 minutes when connected to the AC500.
Price & Value
While pricing varies, the AC500 + one B300K battery typically costs several thousand dollars. However, given its capacity, expandability, and professional-grade inverter, it competes strongly against EcoFlow and Goal Zero’s large backup systems. The value lies in scalability and Bluetti’s reputation for LiFePO4-based safety.
Ideal Use Cases
The Bluetti AC500 + B300K shines in situations where reliable, expandable backup power is essential:
- Whole-home emergency backup during outages
- Off-grid cabins or workshops
- Long-term RV or vanlife setups with heavy energy needs
- Supplementing solar arrays for grid-tied or hybrid systems
Pros and Cons
Pros
- High 5,000W output with 10,000W surge
- Expandable up to 16.6kWh with 6 B300Ks
- LiFePO4 safety and longevity
- 0ms UPS switchover for sensitive electronics
- Fast 45-minute recharge (to 80%) when paired with AC500
Cons
- Heavy and bulky at 65 lbs per battery
- No cycle-life rating listed in the manual
- Best suited for stationary setups, not portability
- Premium cost compared to smaller Bluetti stations
Final Verdict
The Bluetti AC500 + B300K is a powerhouse system designed for those who want serious, scalable energy independence. While it’s not portable like smaller stations, it delivers exceptional inverter capacity, modular battery expansion, and professional-grade backup features. Ideal for homeowners, off-grid cabins, and anyone needing reliable whole-home backup power.
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FAQs
How many B300K batteries can I connect to the AC500?
Up to six B300K units can be connected, providing a maximum 16,588.8Wh capacity.
Does the AC500 + B300K support UPS functionality?
Yes. With the correct 240V setup, it can achieve a seamless 0ms switchover for essential electronics.
Can the B300K charge and discharge at the same time?
Yes. The B300K supports pass-through charging, meaning you can power devices while the battery is recharging.
What is the weight of one B300K battery?
Each B300K weighs approximately 65 lbs, so lifting assistance is recommended.
Last update on 2026-02-08 / Affiliate links / Images from Amazon Product Advertising API