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BLUETTI B300K Expansion Battery for AC500 - 2,764.8Wh

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B300k-AC500

$1,248.99
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BLUETTI B300K Expansion Battery | AC500 Compatible | Scalable Backup Power | LiFePO₄

Reliable, High-Capacity Energy for AC500 systems. The BLUETTI B300K is a 2,764.8Wh LiFePO₄ expansion battery designed to extend the capacity of your AC500 system. With automotive-grade cells and 6,000+ life cycles, it delivers safe, long-lasting power for home backup, RVs, or off-grid adventures. Stack multiple units to customize your system for any scenario.

Key Features

  • High-Capacity Modular Storage (2,764.8Wh): Extends runtime for essential devices and appliances during outages.
  • AC500-Optimized LiFePO₄ Battery Technology: Advanced automotive-grade cells ensure long lifespan, thermal stability, and consistent performance over thousands of cycles.
  • Seamless AC500 Compatibility: Integrates with AC500 systems for stable communication, fast charging, and reliable performance.
  • Scalable Energy Expansion: Stack multiple B300K units or combine with B300/B300S batteries to scale up to 33,177.6Wh.
  • Fast Charging & Standalone Power: Charges up to 80% in 45 minutes with AC500. USB-A port allows independent device charging.
  • Built to Last & Protect: Square LiFePO₄ cells, AI-BMS technology, aluminum casing, wireless internal components, and efficient cooling ensure long-term reliability.
  • 3+1 Year Warranty: Extended coverage provides peace of mind for your AC500 expansion setup.

Applications

  • Home Backup & Emergency Power with AC500
  • RV & Van Life Power Expansion
  • Off-Grid Cabins, Studios, & Outdoor Living
  • Disaster Preparedness & Extended Outages
  • Scalable Modular Energy Systems

Why Choose the BLUETTI B300K for AC500?

  • Extend Your Runtime: Add 2,764.8Wh for longer power during storms, outages, or off-grid adventures.
  • Flexible & Scalable: Stack or mix with other B-series batteries to grow your system as energy needs increase.
  • Standalone & Integrated Use: Works as an expansion for AC500 or independently powers devices via USB-A ports.
  • Fast, Safe, and Reliable: Rapid charging, robust safety features, and LiFePO₄ chemistry ensure dependable energy anytime.

What’s Included

  • 1 × BLUETTI B300K Expansion Battery
  • 1 × P090A Battery Expansion Cable
  • 1 × P150D to P090D Cable
  • 1 × User Manual & Warranty Documentation

Specifications

Parameter Details
Battery Info
ModelB300K
Battery Capacity2,764.8 Wh (51.2 V, 54 Ah)
Battery TypeLiFePO₄ (Lithium Iron Phosphate)
Cycle Life6,000+ cycles to 80% capacity
Output
USB-A Port12 W Max, 5 V / 2.4 A
Total Capacity2,764.8 Wh
General
Weight29.5 kg / 65.04 lbs
Dimensions (L × W × H)52.5 × 32.7 × 20.9 cm / 20.67 × 12.87 × 8.23 in
Charging Temperature0 °C to 40 °C / 32 °F to 104 °F
Discharging Temperature−20 °C to 40 °C / −4 °F to 104 °F
Storage TemperatureUp to 1 month: −20 °C to 40 °C / −4 °F to 104 °F
Up to 6 months: −20 °C to 25 °C / −4 °F to 77 °F
Working Humidity5% to 95% RH
Max Charging Current60 A (may decrease outside specified temps)
Max Discharging Current70 A
Expansion Ports2 × Expansion Port, 58.4 VDC Max, 90 A Max
Compatibility
Compatible ModelsAC200L, AC200MAX, AC300, AC500, Apex 300
Warranty
Warranty3 + 1 Years

Understanding Your Power Needs

Power Calculation Guide

Sizing Metric Formula & Example
Energy Consumption (Wh) Formula: Watts × Hours
Example: 60W × 4 hrs = 240 Wh
Battery Capacity (Ah) Formula: Watt-hours ÷ System Voltage (V)
Example: 240 Wh ÷ 12V = 20 Ah
Inverter Size (W) Formula: Total Watts × 1.25 (safety margin)
Example: 300W × 1.25 = 375W → Use 400W inverter
Total Load Power (W) Formula: Sum of all appliance watts used simultaneously
Example: Light (10W) + Fan (75W) = 85W
Runtime (hrs) of Battery Formula: (Battery Ah × Voltage) ÷ Total Load (W)
Example: (100Ah × 12V) ÷ 240W = 5 hrs

Find Your Power Match

Need / Application System Recommendation
Basic lighting + phone charging Recommended Battery: 50Ah – 100Ah (12V)
Inverter Size: 100W – 200W
Notes: For small backup setups
Home office (laptop, fan, TV) Recommended Battery: 150Ah – 200Ah (12V or 24V)
Inverter Size: 500W – 1000W
Notes: For moderate usage with 4–6 hours of backup
Home backup (fridge, lights) Recommended Battery: 200Ah+ (24V or 48V recommended)
Inverter Size: 1000W – 1500W
Notes: Ideal for longer backups or heavier loads
Business / shop power backup Recommended Battery: 300Ah+ (48V system)
Inverter Size: 2000W – 3000W
Notes: Suitable for commercial setups or extended power outages

Why Shop With Us

  • Authorized & Trusted Dealer: We’re fully authorized for every brand we carry, so you get genuine products backed by full manufacturer warranties.
  • Fast, Reliable Shipping: Shipped from U.S. warehouses with quick, dependable freight options — keeping your project on track.
  • 30-Day Hassle-Free Returns: Changed your mind? Enjoy a simple 30-day return process for peace of mind.
  • Real Human Support, 7 Days a Week: Reach us by phone, email, or live chat — no bots, no overseas call centers, just experts who know off-grid power systems.
  • Expert Energy Guidance: Our solar and backup energy specialists are here to help with system design, product questions, and installation tips.
  • USA-Based Service: Local, knowledgeable, and friendly support right here in the U.S.
  • Secure Payments: Shop confidently with encrypted, secure checkout protecting your personal and payment information.
  • Built for Energy Independence: Whether powering a cabin, prepping for emergencies, or going off-grid, our products are chosen for performance, reliability, and sustainability.

BLUETTI B300K Expansion Battery for AC500 - 2,764.8Wh

$1,248.99