BLUETTI B300S Expansion Battery 3072Wh

BLUETTI B300S Expansion Battery | 3,072Wh

Scale your backup to whole-home size

When essential-device backup isn’t enough and you want to run the whole house, the BLUETTI B300S is how you get there. It’s a high-capacity 3,072Wh LiFePO₄ expansion battery built to grow your BLUETTI AC500 system into a serious home-backup and off-grid solution stackable all the way up to 36,864Wh. For Jamaica, where outages drag on and electricity costs bite, that’s the capacity to keep a household running and to store real solar energy.

3,072Wh of long-life storage

Each B300S adds 3,072Wh of LiFePO₄ capacity rated for 3,500+ charge cycles roughly a decade of daily use. That’s stable, dependable storage for extended outages, solar setups, and high-demand backup, without swapping out the system you already have.

Built to expand the AC500 system

The B300S is made to scale the BLUETTI AC500. A single AC500 supports up to six B300S batteries (18,432Wh), and a dual configuration two AC500 units with up to twelve B300S batteries reaches a massive 36,864Wh, enough for whole-home backup or a substantial solar store. It also works in an AC500 + B300 configuration, which requires an additional P150D to P090D cable (sold separately).

Works as a standalone power source

Even without an AC500 attached, the B300S can power essentials on its own through its built-in ports:

• 100W USB-C — laptops and fast-charging devices
• USB-A (18W) — phones and small electronics
• 12V/10A car output — routers, coolers, 12V lighting, and DC gear

Handy for keeping phones, a laptop, or the router alive directly from the battery when that’s all you need.

Flexible charging

Connected to a compatible BLUETTI system like the AC500, the B300S recharges via AC wall power, solar panels, or a vehicle covering both grid-connected home backup and fully off-grid solar setups. That range makes it a natural fit for solar-first energy systems.

Temperature-resilient performance

A built-in Temperature Adaptive Function keeps the B300S performing reliably across a wide temperature range and through fluctuating conditions. Its LiFePO₄ chemistry handles heat and repeated cycling well a genuine advantage for Jamaica’s climate and for outdoor installations, cabins, and RV setups.

Built for large-scale backup

The B300S is designed for the demanding jobs: expanding whole-home backup, building out solar energy storage, powering RV setups, and supporting long-term off-grid living where dependable capacity is non-negotiable.

Specifications

Ideal for

• Whole-home backup during extended outages
• Solar energy storage in a tropical climate
• RV and mobile off-grid power
• Cabins and remote off-grid installations

FAQs

How much capacity does the B300S add, and how long can it run my home?

Each B300S holds 3,072Wh enough to run essentials like a fridge, lights, fans, and a router for many hours during an outage. A single AC500 takes up to six B300S units (18,432Wh), and for whole-home coverage you can stack up to twelve across two AC500 stations for a total of 36,864Wh.

Is the B300S compatible with the AC500?

Yes, it’s purpose-built as an expansion battery for the AC500 system, with up to six units per AC500 and up to twelve across two AC500 stations. To use it in an older AC500 + B300 setup, you’ll need an additional P150D to P090D cable, sold separately.

Can the B300S work on its own, without an AC500?

Yes. Its built-in 100W USB-C, USB-A, and 12V/10A car output let it charge phones, laptops, routers, and small electronics directly no AC500 required for those smaller jobs.

How many charge cycles does it last?

Its LiFePO₄ cells are rated for 3,500+ cycles before noticeable capacity loss one of the longest-lasting battery chemistries available, and roughly 10+ years of daily use under normal conditions.

How do you recharge the B300S?

Connected to a compatible BLUETTI system like the AC500, it recharges from AC wall power, solar panels, or a vehicle flexible enough for both grid-connected backup and off-grid solar energy setups.

What’s the maximum system capacity I can build?

Up to 36,864Wh, by connecting twelve B300S units across two AC500 power stations a configuration aimed at whole-home backup and serious long-term off-grid systems.

Is the B300S good for solar storage in Jamaica?

It’s a strong fit. With grid outages and high power costs, off-grid solutions make real sense here, and the B300S’s LiFePO₄ chemistry handles heat and repeated cycling well ideal for tropical solar setups.

Can I use it for an RV or off-grid setup?

Yes. Its temperature-adaptive design, long cycle life, and flexible charging make it well suited to RVs, mobile off-grid rigs, and remote cabin installations where reliable storage matters.

What can I charge directly from the standalone ports?

Smartphones, tablets, and laptops (via 100W USB-C), plus routers and 12V accessories like coolers or lighting through the 12V/10A car port keeping essentials running even without the AC500 connected.

Downloads

• 📄 BLUETTI B300S Expansion Battery User Manual (US, PDF)

Build the backup your home needs

Whether you’re powering the whole house through an outage or storing a day’s worth of solar, the BLUETTI B300S scales to the job. Add it to your cart, and if you’d like help planning an AC500 system or confirming which cables you need, get in touch we’ll spec the right configuration with you.