What is the BLUETTI B300K expansion battery and what is it designed for?

The BLUETTI B300K is a 2,764.8Wh LiFePO4 expansion battery module built specifically to scale up the BLUETTI AC500 power system. It is designed for whole-home backup, off-grid cabins, RV setups, solar energy storage, and any high-demand application where extended runtime and large capacity are essential.

How much total capacity can I build using the BLUETTI B300K with the AC500?

By stacking multiple B300K modules with the AC500, you can build a fully customizable energy system ranging from 5kWh to 15kWh or more depending on how many units you connect. This scalability makes it suitable for everything from short-term home backup to full-time off-grid living with heavy appliance loads.

What appliances and devices can the BLUETTI B300K power during a home outage?

When paired with the AC500, the B300K can power refrigerators, freezers, air conditioners, heaters, lights, routers, home electronics, power tools, workshop equipment, and medical devices. Its large 2,764.8Wh capacity ensures extended runtime across multiple essential loads during prolonged power outages.

How long does the BLUETTI B300K battery last before it needs replacing?

The B300K uses LiFePO4 cells rated for over 3,500 charge cycles, which under regular daily use translates to approximately 10 or more years of reliable service life. Its superior heat resistance and stable chemistry also contribute to long-term durability beyond what standard lithium-ion batteries typically offer.

Is the BLUETTI B300K compatible with solar panel charging?

Yes, when connected to the BLUETTI AC500, the B300K fully supports high-efficiency solar charging for off-grid and renewable energy setups. This makes it an excellent storage solution for RV solar systems, off-grid cabins, and homeowners looking to store clean solar energy and reduce electricity bills.

Can the BLUETTI B300K be used without the AC500 connected?

Yes, the B300K includes its own independent output ports that allow you to charge or power small devices directly without needing the AC500 host unit connected. However, for high-wattage appliances and full system functionality, pairing it with the AC500 is required to unlock its complete power delivery capabilities.

What safety protections are built into the BLUETTI B300K?

The B300K is equipped with an advanced Battery Management System that provides overcharge and over-discharge protection, temperature monitoring, overcurrent protection, and short-circuit safeguards. These protections ensure safe and stable operation whether the unit is deployed indoors for home backup or outdoors in demanding field conditions.

How easy is it to install and expand the BLUETTI B300K system?

The B300K is designed for straightforward stacking and integration with the AC500, requiring no complex wiring or technical expertise to set up. Additional B300K modules can be added as your power needs grow, making it a genuinely scalable system that expands alongside your energy requirements over time.

Is the BLUETTI B300K a good fit for RV and van life power setups?

Yes, the B300K is an excellent choice for RV and van life applications where large energy storage, solar compatibility, and reliable performance under varying temperatures are all critical requirements. Its stackable design allows you to tailor total capacity to your specific mobile living needs without overbuilding from the start.

How does the BLUETTI B300K compare to the B300S expansion battery?

Both the B300K and B300S are AC500-compatible LiFePO4 expansion batteries, but the B300S offers a slightly larger 3,072Wh capacity per unit while the B300K provides 2,764.8Wh per module. The choice between them depends on your specific capacity targets and budget, as both deliver over 3,500 charge cycles, BMS protection, and seamless AC500 integration for long-term energy storage.

BLUETTI B500K 5120 Wh LiFePO₄ high-capacity expansion battery pack for scalable home, RV, off-grid solar and backup power systems

BLUETTI B500K 5120 Wh LiFePO₄ high-capacity expansion battery pack for home, RV, off-grid solar, and backup power systems

BLUETTI B500K 5120 Wh LiFePO₄ high-capacity expansion battery pack for home backup, RV, off-grid solar, and portable power systems

BLUETTI B500K2 modular LiFePO₄ expansion battery pack for high-capacity home, RV, off-grid solar, and backup power systems

BLUETTI B300K expansion battery for AC500

Name: BLUETTI B300K Expansion Battery | 2,764.8Wh High-Capacity Power Module
SKU: BLU-B300K-AC500
Price: 1699.00 USD
Availability: BackOrder

in BLUETTI Expansion Batteries

Sku: BLU-B300K-AC500

US$1,699.00

Available on backorder

Description

BLUETTI B300K Expansion Battery | 2,764.8Wh High-Capacity Power Module

Unlock serious runtime with the BLUETTI B300K, a high-capacity 2,764.8Wh LiFePO₄ expansion battery built to scale up your BLUETTI power system. Whether you’re preparing for whole-home backup, powering an off-grid cabin, or extending your RV and van setup, the B300K adds massive, reliable storage that grows alongside your energy needs.

2,764.8Wh of expandable capacity

Stack multiple B300K modules to build a customizable energy system capable of running refrigerators and freezers, lights, routers and home electronics, power tools and workshop equipment, medical devices, and long-term off-grid loads. When connected with the AC500, total capacity expands up to a massive 33,168Wh enough for extended outages and full-time off-grid living. Green Vista Living

Broad BLUETTI compatibility

Unlike single-host add-ons, the B300K integrates seamlessly across the BLUETTI ecosystem. It’s compatible with the BLUETTI AC200L, AC200MAX, AC300, and AC500 power stations, so you can expand whichever system you already own. Connecting to the AC500 requires the P090D to P150D cable (sold separately). BluettipowerOffGrid Living

Fast recharging

When paired with the AC300 or AC500, the B300K charges up to 80% in just 45 minutes, so you can get back to what matters with minimal interruption. BLUETTI

Long-life LiFePO₄ cells

Built with automotive-grade LiFePO₄ technology rated for 4,000+ life cycles, the B300K delivers superior safety, better heat resistance, and years of dependable daily use. A robust aluminum casing, advanced AI-BMS, wireless components, and an efficient cooling fan keep it running reliably in any environment. Green Vista LivingBLUETTI

Solar-ready energy expansion

Paired with a compatible host, the B300K supports high-efficiency solar charging ideal for off-grid cabins, RV and van life, renewable home power systems, and cutting your electricity bills.

Doubles as a standalone power hub

The B300K isn’t just a storage add-on. With a built-in 12W USB-A port, it works as a standalone power source to charge small essentials like phones and tablets even when disconnected from the host unit. (Note: the B300K itself can only be recharged when connected to a compatible AC200L / AC200MAX / AC300 / AC500 host.) OffGrid Living

Smart, safe, and controlled

An advanced Battery Management System protects against overcharge and over-discharge, monitors temperature, and guards against overcurrent and short circuits keeping your system safe indoors or in demanding field conditions.

Strong, stackable, and easy to use

Its compact, stackable design makes installation and expansion effortless perfect for whole-home backup, RV/van power, workshops and field operations, long camping trips, and solar-powered living.

Product Overview

Power Expansion for Every Situation

The B300K adapts to your life, whether you’re safeguarding your home during outages or powering an off-grid adventure. Stack multiple B300K batteries, or mix and match with B300, and B300S models for a customized energy solution that ensures you’re never caught without power, no matter where you are.
*Need P150D to P090D cable to connect the AC500.

Great Compatibility for More Possibilities

The B300K seamlessly integrates with AC200L, AC200MAX, AC300, Apex 300 and AC500* power stations, giving you the flexibility to scale your energy setup as your needs grow. Whether you’re prepping for more power at home or gearing up for your next adventure, the B300K has you covered.

* A P090D to P150D cable is required for connecting with AC500 and sold separately.

Built to Protect, Designed to Last

The B300K is designed to excel in safety and reliability. Featuring square LiFePO₄ batteries and cutting-edge AI-BMS technology, together with a robust aluminum casing, advanced wireless components, and efficient cooling fan ensure this battery stands the test of time, giving you a power source you can count on in any situation.

Fast Charging Comes in Handy

When paired with the AC300 or AC500, this battery charges up to 80% in just 45 minutes, so you can get back to what matters without any significant interruption, your work, activities, or emergencies …whether you’re at home or on the go.

A Standalone Power Source, A Standout Performance

The B300K isn’t just an add-on; it’s also a versatile power hub. With a USB-A port, it’s perfect for keeping your essentials like smartphones, tablets, or fans charged, whether you’re ready to make an urgent call or message, eager to share beautiful moments with your friends, or try to stay cool while camping in a tent. Power is always within reach, wherever life takes you.

Tech Specs

B300K

FAQs

Q1: How to claim warranty?

Once you receive your product, please register to claim your warranty on our website.

Q2: Why doesn’t the B300K drain all its power?

The B300K retains a portion of its energy to prevent overdischarging, which helps protect the battery’s lifespan and ensures long-term performance.

Q3: Can I leave the battery uncharged after fully discharging?

No, it’s important to recharge the B300K in time before the SoC drops to 1% to avoid potential damage. Additionally, ensure it’s placed in an environment of at least 10°C (50°F) for at least 12 hours before recharging.

Q4: Which BLUETTI power stations can work with B300K?

B300K is compatible with AC200L, AC200MAX, AC300, and AC500. When connecting to AC500, the P090D to P150D cable is required for connecting with AC500 and sold separately.

Q5: Can I use the B300K alone?

Yes. B300K is a standalone power source with a 12W USB-A port.

Note: The B300K can only be charged by connecting to the AC500/AC300/AC200L/AC200MAX

Q6: Does the B300K support power bank mode?

No.

Q7: How many B300K batteries can l connect with AC300? Can l mix B300K/B300/B300S?

The AC300 supports connecting with up to 4 B300 / B300K using the P090A cable.

Note: The AC300 can mix and match with B300 and B300K. However, it cannot connect B300, B300K, and B300S batteries simultaneously.

Q8: How many B300K batteries can l connect with AC500? Can l mix B300K/B300/B300S ?

The AC500 supports up to 6 B300K. The P150D to P090A cable is required for connecting the AC500 with B300K or B300K with B300S.

The AC500 can mix and match with B300, B300S, and B300K, with up to 6 total battery packs.

Note: For the combo with one AC500 unit, if B300 is included, up to 4 battery packs can be connected; if not, up to 6 packs can be connected.

Q9: How many B300K batteries can l connect with AC200L? Can l mix B300K/B300/B230/B210 ?

The AC200L supports up to 2 B300K for up to 7,577.6Wh capacity using the P090D cable.

Note: AC200L can only mix with B300 and B300K.

Q10: How many B300K batteries can l connect with AC200MAX? Can l mix B300K/B300/B230/B210 ?

AC200MAX supports up to 2 B300K for up to 7577.6Wh capacity using the P090D cable.

Q11: How long does it take to charge the B300K to 80%?

Connecting with AC300 / AC500, you can charge the B300K to 80% in 45 minutes using a 30A charging cable.

Note: For reference ONLY.

Q12: Can one AC200MAX expansion port connect to the B300K and the other to the B230/B210?

Yes, you can

Q13: If the B300K is mixed with other battery packs, can I monitor the status of different packs?

Yes. Connect it to the AC300 / AC500 / AC200L / AC200MAX, and you can control the system via the BLUETTI App at any time, from anywhere.

Q14: Can I use B300K alone as a UPS?

Q15: Can l use solar panels or car cigaretter lighter to charge B300K?

No. The B300K can only be charged by connecting to the AC500 / AC300 / AC200L / AC200MAX.

Q16: Can I use or charge B300K in sub-zero temperatures?

Temperature ranges for B300K are:

Charge: 0 to 40℃ (32 to 104℉);
Discharge: -20 to 40℃ (-4 to 104℉);
Storage: -20 to 40℃ (-4 to 104℉).

Technically, it can power electrical devices under such situations, but please avoid charging it.

Q17: How long can it run my device?

Running time = Battery capacity × DoD × η ÷ Device rated power DoD refers to Depth of Discharge and η is local inverter efficiency. For B300K, both DoD and η are 90%. If you run a 100W light bulb with it, the running time will be:

2,764.8Wh × 90% × 90% ÷ 100W ≈ 22.39hrs

Note: The above data is for reference ONLY.

Q18: Is B300K waterproof?

No. Also, please do NOT store it in a humid environment for a long time.

Q19: Is it possible to replace the built-in battery?

No. If the battery pack is faulty or even dead, please contact BLUETTI Customer Service.

Q20: How to access more tutorial videos for the AC300 / AC500 / AC200MAX / AC200L and B300K combo?

Follow BLUETTI Support on YouTube for more videos.

Q21: Does the B300K have a Power Bank mode?

No.

Reviews (0)

Ratings

0.0

0 Product Ratings

Review this product

Share your thoughts with other customers

Write a review

Reviews

There are no reviews yet.