BLUETTI AC300 + B300
BLUETTI
AC300 + B300:
Modular Power,
Built to Scale
3,072Wh base / 12,288Wh expandable, 3,000W pure sine wave output, 2,400W dual-MPPT solar input, 240V split-phase with two units, 24/7 UPS mode, and LiFePO4 chemistry rated for 3,500+ cycles — BLUETTI's most versatile modular energy system.
product photo
What Is the BLUETTI AC300 + B300?
The AC300 is an inverter unit — the brains of the operation — that contains no internal battery of its own. Instead it pairs with external B300 battery modules, each holding 3,072Wh of LiFePO4 energy. That separation is intentional: you start with one B300 and expand over time, adding up to four modules for a total of 12,288Wh. For most households, that's multiple days of essential power without a single recharge.
The AC300 delivers 3,000W of pure sine wave AC output with a 6,000W surge rating, along with a port roster that covers every device you own: six 120V outlets, a 30A TT-30 RV port, dual 100W USB-C, fast-charge USB-A, a 24V car outlet, and two 15W Qi wireless charging pads. The base AC300 + 1×B300 bundle runs roughly $1,699–$1,999 depending on sales — a serious investment that delivers serious infrastructure.
🔋 Modular Up to 12,288Wh
Add up to four B300 batteries per AC300. No other system at this price comes close to this scalability.
⚡ 3,000W Pure Sine Wave Inverter
6,000W surge rating handles high-startup-load appliances without flinching.
☀️ 2,400W Dual-MPPT Solar Input
Two independent MPPT controllers accept different panel voltages simultaneously.
🔌 240V Split-Phase Support
Pair two AC300 units for 240V output — enabling electric dryers and EV charging.
🛡️ 24/7 UPS Mode
Millisecond-level switchover keeps your home running through outages without interruption.
🚐 30A RV Port Built In
TT-30P port handles full RV 30A service without adapters.
No Internal Battery — The AC300 Requires at Least One B300
Unlike all-in-one power stations, the AC300 has no internal battery. You must purchase at least one B300 module to operate it. The base AC300 + 1×B300 bundle pricing accounts for this, but budget for the full system from the start.
What We Love
- Modular design scales from 3,072Wh to 12,288Wh
- 3,000W pure sine wave inverter with 6,000W surge
- LiFePO4 chemistry: 3,500+ cycles, decade-long lifespan
- Dual independent MPPT controllers — two solar arrays simultaneously
- 240V split-phase with a second AC300
- 24/7 UPS mode with millisecond switchover
- Stackable tower keeps footprint compact
The Trade-offs
- AC300 has no internal battery — at least one B300 required to operate
- Heavy — AC300 is ~52 lbs, each B300 is ~66 lbs
- Mobile app behind EcoFlow in polish
- 240V for dryers requires purchasing a second AC300
- Full 4-battery expansion costs $4,000+
Where to Buy
Recommended| Specification | BLUETTI AC300 + B300 |
|---|---|
| Base Capacity (1×B300) | 3,072Wh |
| Maximum Capacity (1×AC300) | 12,288Wh (with 4× B300 modules) |
| Battery Chemistry | LFP (Lithium Iron Phosphate) — 3,500+ cycle rating |
| AC Output (Continuous) | 3,000W pure sine wave |
| AC Output (Surge) | 6,000W |
| Solar Input | 2,400W (dual independent MPPT) |
| UPS Mode | 24/7 UPS with millisecond switchover |
| Weight — AC300 | ~52 lbs (23.6kg) |
| Weight — B300 Module | ~66 lbs (30kg) each |
| Warranty | 4 years |
LFP Chemistry — Why It Matters for Home Backup
LFP batteries offer significantly better thermal stability than NMC alternatives — far less prone to thermal runaway, making them safer for indoor installation. LFP cells also degrade more slowly under frequent deep cycling. The B300's 3,500+ cycle rating at 80% capacity means roughly 10 years at one full cycle daily.
What BLUETTI Got Right
The AC300 + B300 is the most thoughtfully engineered modular power system at its price point. The separation of inverter and battery enables a scalability path that purpose-built home battery systems charge three to five times more for. The dual independent MPPT solar controllers are a genuine technical advantage over single-controller competitors. The LFP chemistry's 3,500+ cycle rating reframes the investment: at one cycle per day, this battery lasts nearly a decade before meaningful degradation.
What Still Needs Work
The 4-year warranty is the AC300's most meaningful competitive weakness — not because the hardware is fragile, but because the warranty gap creates uncertainty over a system expected to perform for a decade. The mobile app, while significantly improved, still trails EcoFlow in polish. And the 24V DC port labeling creates a genuine risk of damage to 12V accessories.
The Verdict
The BLUETTI AC300 + B300 earns its Editor's Choice status for the buyer who values modular scalability, LFP longevity, and dual-MPPT solar flexibility above all else — particularly at the entry price point. If you're starting with one B300 and plan to grow the system over time, no competing system offers this path at this cost.
