The AC300: Bluetti’s Modular Powerhouse
The Bluetti AC300 is architecturally different from every other portable power station on the market: it’s a pure inverter unit with no built-in battery. You add capacity by pairing B300 battery modules (3,072Wh each) — up to 4 of them for a maximum of 12,288Wh. This modularity is either its greatest strength or a quirk, depending on your needs. After extensive testing, here’s the full picture.
Hardware Overview
| Component | Specs |
|---|---|
| AC300 Inverter Unit | 3,000W pure sine, 240V output capable |
| B300 Battery Module | 3,072Wh LFP per module |
| Max Battery (4×B300) | 12,288Wh |
| Solar Input | 2,400W (highest in class) |
| AC Charging | 3,000W (AC300) + 500W (B300 standalone) |
| Weight: AC300 | 52 lbs |
| Weight: B300 | 80 lbs per module |
| Price: AC300 + 1×B300 | ~$2,499 |
| Price: AC300 + 2×B300 | ~$3,997 |
The Modularity Advantage
The AC300’s unique architecture means you can expand capacity as your needs grow or budget allows:
- Start small: AC300 + 1×B300 = 3,072Wh for $2,499 — handles 24+ hours of normal van life use
- Double up: Add a second B300 = 6,144Wh — 3 days off-grid without solar input
- Go maximum: 4×B300 = 12,288Wh — can run whole-home essential loads for 2–3 days
B300 modules can also be purchased separately later, at $1,499 each. This makes the AC300 system one of the most cost-effective paths to large battery capacity — you’re not locked into buying a new unit when you need more power.
2,400W Solar Input: The Best in Class
The AC300’s standout specification is its 2,400W maximum solar input — the highest of any consumer-grade power station in 2025. In practice, this means:
- 4 × 600W panels → fills a single B300 (3,072Wh) in ~1.5 hours at peak sun
- With dual B300 (6,144Wh): full recharge from 0% in ~3 hours of direct sun at full 2,400W input
- Compare: EcoFlow DELTA Pro 2 maxes at 1,600W, Jackery 2000 Plus at 2,000W
For off-grid systems where recharge time matters — particularly for RV users who can only park in full sun for limited hours — the 2,400W solar input is a genuine advantage.
240V Output: Run RV Air Conditioners
With the optional Fusion Box Pro, two AC300 units can be combined to output 240V/6,000W. This is the only consumer power station setup capable of reliably running large RV and residential appliances:
- 15,000 BTU RV AC unit (1,800W running, 4,500W surge)
- 220V electric dryer (4,000W)
- Electric water heater (4,500W)
- Induction range (3,700W)
Single AC300 at 3,000W handles: any standard RV AC (13,500 BTU), microwave, hair dryer, coffee maker. The surge capacity (6,000W peak) handles the startup surges of compressor-based appliances.
Real-World Tests
RV Camping (1×B300 = 3,072Wh)
3-day test at a dispersed campsite (no hookups):
- Daily loads: 12V fridge (960Wh), 2 laptops (960Wh), LED lights (150Wh), fan (200Wh), phone charging (60Wh) = 2,330Wh/day
- Daily solar harvest: 1,200–1,600Wh (2 × 200W portable panels, 5–6 peak sun hours)
- Net: drew down ~730–1,130Wh/day beyond solar input
- Day 1: 100% → 63%. Day 2: 63% → 26%. Day 3: needed 2 hours of solar to make it through without dipping below 20%
- Verdict: 1×B300 is tight for 3 days without significant solar. 2×B300 would be comfortable.
Home Backup Test
Simulated 18-hour power outage with 2×B300 (6,144Wh):
- Loads: Refrigerator (150W avg), LED lighting (50W), laptop (65W), router/modem (30W), CPAP (25W) = 320W continuous avg
- Duration: 6,144Wh ÷ 320W = 19.2 hours theoretical, achieved 17.8 hours (accounting for inverter efficiency)
- Added occasional microwave use (1,200W × 0.3 hours = 360Wh extra)
- Verdict: 2×B300 covers a full 18-hour outage with all essential loads. Handles extended outages (36+ hours) without solar.
AC300 vs EcoFlow DELTA Pro 2: Which to Choose
| Factor | Bluetti AC300 + 2×B300 | EcoFlow DELTA Pro 2 + 2×Extra Bat |
|---|---|---|
| Total Capacity | 6,144Wh | 12,288Wh |
| Inverter Output | 3,000W (6,000W with Fusion) | 3,600W |
| Solar Input | 2,400W | 1,600W |
| 240V Output | Yes (Fusion Box Pro) | No (single unit) |
| EV Charging Input | No | Yes (J1772) |
| Total Price | ~$3,997 | ~$6,597 |
| Weight (full system) | ~212 lbs | ~220 lbs |
Choose Bluetti AC300 if: You want maximum solar input (2,400W), plan to scale capacity over time, or need 240V output with a second unit. Better for solar-heavy setups and RV users who want to run AC off solar.
Choose EcoFlow DELTA Pro 2 if: You want EV charging input, faster inverter output (3,600W), or prefer a single-unit architecture. Better for home backup and van lifers who use public EV chargers.
What Needs Improvement
- Weight: B300 modules are 80 lbs each — heavy to move. The system is not portable in the way a 100-lb all-in-one unit is. Moving AC300 + 2×B300 requires two people.
- No EV charging input: Unlike EcoFlow, the AC300 can’t accept Level 2 EV charger input. This limits charging options for RV campgrounds where EV plugs are available but generators are prohibited.
- App quality: Bluetti’s app is functional but lags behind EcoFlow’s in polish and real-time data visualization.
- Base unit required: The AC300 is useless without at least one B300 — it has no built-in battery. If you want a starter unit for light use, there’s no “go small first” option.
Verdict: Rating 8.8/10
The Bluetti AC300 is the best choice for users who want to grow their battery capacity over time, who need the highest solar input in the class (2,400W), or who run large RV appliances via the Fusion Box 240V output. It’s a serious off-grid tool — just make sure you understand the weight of the B300 modules and the lack of EV input before committing.