Power Expansion, Smarter & Stronger
The Bluetti B300K2 gives you dependable backup power when you need it most—whether you're upgrading your home energy storage or planning for total off-grid independence. With flexible compatibility and rugged build quality, it’s a future-proof solution for growing power demands.
2,764.8Wh LiFePO4 Battery: Reliable energy storage with over 4,000 life cycles to 80%—built to last.
Modular Power Expansion: Works with AC200L, AC200MAX, Apex300, AC300*, and AC500* systems.
Cable Compatibility Notes:
Works with Apex300 using CA90 cable (included).
To connect with AC300, use P090A Cable (SKU: A-CBC-D6D24-UN-L80-0396) – sold separately.
To connect with AC500, use P090D to P150D Cable (SKU: A-PTC-NO-UN-P090D-P150D) – sold separately.
Expandable Capacity: Chain multiple B300K2 units or mix with B230, B300, B300S models for up to 33,168Wh with AC500.
USB-A Output Port: Use as a standalone power source to keep essentials like phones and fans running during any situation.
Automotive-Grade Build: Square LiFePO₄ cells, advanced AI-BMS, aluminum housing, and cooling fan ensure performance and protection.
Fast Charging: Recharge to 80% in just 45 minutes when paired with AC300/AC500 (with required cables).
DIY-Friendly Setup: Modular design with clear cable options makes expansion easy and affordable.
Power Expansion, Smarter & Stronger
The Bluetti B300K2 gives you dependable backup power when you need it most—whether you're upgrading your home energy storage or planning for total off-grid independence. With flexible compatibility and rugged build quality, it’s a future-proof solution for growing power demands.
2,764.8Wh LiFePO4 Battery: Reliable energy storage with over 4,000 life cycles to 80%—built to last.
Modular Power Expansion: Works with AC200L, AC200MAX, Apex300, AC300*, and AC500* systems.
Cable Compatibility Notes:
Works with Apex300 using CA90 cable (included).
To connect with AC300, use P090A Cable (SKU: A-CBC-D6D24-UN-L80-0396) – sold separately.
To connect with AC500, use P090D to P150D Cable (SKU: A-PTC-NO-UN-P090D-P150D) – sold separately.
Expandable Capacity: Chain multiple B300K2 units or mix with B230, B300, B300S models for up to 33,168Wh with AC500.
USB-A Output Port: Use as a standalone power source to keep essentials like phones and fans running during any situation.
Automotive-Grade Build: Square LiFePO₄ cells, advanced AI-BMS, aluminum housing, and cooling fan ensure performance and protection.
Fast Charging: Recharge to 80% in just 45 minutes when paired with AC300/AC500 (with required cables).
DIY-Friendly Setup: Modular design with clear cable options makes expansion easy and affordable.
No obligation — get a custom quote in minutes
Bluetti B300K2 Expansion Battery Module | 2,764.8Wh LiFePO4 | AC200L, AC200MAX, AC300, AC500, Apex300 Compatible | 3+1 Year Warranty
Testimonials
Join thousands of happy customers who made the switch to solar.
"Amazing experience from start to finish. The team was incredibly helpful and the system is performing beyond expectations. Couldn't be happier with our decision."
"The whole process was seamless. From ordering to installation, everything was straightforward. Our electricity bill has dropped significantly!"
"Best investment we've made for our home. The customer support is outstanding — they walked us through every step of the setup process."
"We compared prices everywhere and this was by far the best deal. The quality of the panels is top-notch and installation guidance was superb."
"Great product and even better customer service. They helped us design the perfect system for our needs. Highly recommend to anyone considering solar."
"From the free proposal to the final install, everything exceeded our expectations. We're producing more energy than we consume most months!"
"Amazing experience from start to finish. The team was incredibly helpful and the system is performing beyond expectations. Couldn't be happier with our decision."
"The whole process was seamless. From ordering to installation, everything was straightforward. Our electricity bill has dropped significantly!"
"Best investment we've made for our home. The customer support is outstanding — they walked us through every step of the setup process."
"We compared prices everywhere and this was by far the best deal. The quality of the panels is top-notch and installation guidance was superb."
"Great product and even better customer service. They helped us design the perfect system for our needs. Highly recommend to anyone considering solar."
"From the free proposal to the final install, everything exceeded our expectations. We're producing more energy than we consume most months!"
Order With Confidence
Find the answers to some of the most common questions customers have before placing their order.
Yes. Our team can help you choose the right solar kit based on your goals, power needs, and location. We provide personalized guidance before and after your purchase at no additional cost.
Many of our customers complete the majority of installation themselves using our diagrams and support resources. For final electrical connections, a licensed electrician may be required depending on local codes.
While we do not directly install systems, we can help connect you with qualified local professionals and provide technical documentation to support your installer.
We stand behind our products. If you have specific questions about returns, eligibility, or specific product conditions, you can learn more in our help center linked below.
All components are backed by manufacturer warranties. In addition, our team provides free lifetime technical support to assist you throughout the life of your system.
Yes! We offer a variety of flexible payment plans to fit any budget. Options include monthly financing with competitive interest rates, and some plans require no money down. Apply during checkout and get approved in minutes.
If you're ready to place your order, you can go ahead and checkout online right now. If you have questions, our friendly team of solar experts are happy to assist and can take your order over the phone. If you're interested in financing, you will find the application at checkout online. So whatever is best for you, we are happy to accommodate.
Our team works hard to process all orders within 24-48 hours. Most products ship directly to your door using the quickest, most cost effective ground shipping services depending on size. You’ll receive tracking details and delivery coordination as soon as your order ships. Our average shipping times are anywhere from 3-7 days.
You’ll have direct access to our support team via phone, email, and chat. Whether it’s setup guidance or troubleshooting years down the road, we’re here to help.
Flexible Payment Options
We offer a wide variety of payment plan options to meet each customer's needs.
Fill out a short application and we'll match you with multiple payment plan options instantly.
Don't sweat it. We welcome all credit scores and a credit score is not required for approval.
Some payment plans offer as little as no money down, if you qualify.*
| Quality |
Rated 5 out of 5
|
| Easy to Use |
Rated 5 out of 5
|
I love my BLUETTI setup. I have 2 batteries now and works so good. I will add 2 more soon. I am almost totally off grid with my cabin and I love it.
| Quality |
Rated 5 out of 5
|
|---|---|
| Easy to Use |
Rated 5 out of 5
|
Service and shipping was very fast. Cannot say enough about this battery and the AC200Max kit I purchased.....simply perfect for me.
Be aware that these units are very heavy and are best placed in a position where you don't have to move them. I personally have to move my system around sometimes so I built a quick cart for it.
Highly recommend!
| Quality |
Rated 5 out of 5
|
|---|---|
| Easy to Use |
Rated 5 out of 5
|
Great picture!
This is the third battery for my AC300. It is running as a UPS right now but I will install solar panels as money and heat on the roof permit. The power blinked out last week but my internet, WIFI and computer kept running without waiting for them to reboot. No reboot time, that was nice. Everything kept running like nothing happened. No beeping,... the beeping of the old UPS would drive my wife crazy.
| Quality |
Rated 5 out of 5
|
|---|---|
| Easy to Use |
Rated 5 out of 5
|