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Our verdict · Bluetti
A 3,840 W, 120/240 V home and RV station that grows with B500K batteries
The Apex 300 gives 240 V and RV outlets from a single unit, and the B500K battery takes it to nearly 7.9 kWh. Bluetti leaves several specs unstated, so check the listing for warranty and charging details.
- Capacity
- 2,764.8 Wh
- AC output
- 3,840 W
- Wall charge
- 80% in about 40 min
- Weight
- 83.8 lb
Best for
Home circuit backup or a large RV, for owners who want 240 V and RV outlets from one unit and plan to add batteries.
Skip it if
You want something you can carry, or need a stated warranty length and surge rating before you buy.
- 6,000 cycles to 80%
- 3,840 W at 120 V and 240 V at the same time
- 30 A and 50 A RV outlets
- 0 ms switchover in one mode
- 7,884.8 Wh with one B500K
- 83.8 lb, plus 99.2 lb for the B500K
- Solar input of 4,000 W needs the SolarX 4K add-on
- Bluetti doesn't state the warranty years, AC input watts or a surge rating
Rating breakdown (large (2 to 3 kwh) class)
| Criterion | Weight | Score | Based on |
|---|---|---|---|
| Wall charging speed | 20% | 3.0 | input not stated |
| AC output | 20% | 10.0 | 3,840 W |
| Solar input | 10% | 10.0 | 4,000 W |
| Backup switchover | 15% | 10.0 | 0 or 20 (mode dependent) ms |
| Portability | 10% | 4.3 | 33 Wh/lb |
| Expandability | 10% | 3.0 | B300K / B500K batteries; up to 58 kWh with 2–3 units |
| Battery life & warranty | 15% | 6.0 | warranty not stated, 6,000+ cycles |
| Capacity (Wh) | 2764.8 |
|---|---|
| Battery chemistry | LiFePO4 |
| Rated cycle life | 6,000 cycles to 80% |
| AC output, continuous (W) | 3840 |
| AC output, surge (W) | — |
| AC charge time | 80% in about 40 min (input not stated) |
| Max AC charging input (W) | — |
| Max solar input (W) | Not stated for the unit alone (4,000 W with SolarX 4K add-on) |
| Solar input voltage range | — |
| UPS switchover (ms) | 0 or 20 (mode dependent) |
| Weight (lb) | 83.8 |
| Expandable to (Wh) | B300K / B500K batteries; up to 58 kWh with 2–3 units |
| Warranty (years) | Not stated |
Key specs at a glance
What the numbers mean in practice
- 2,764.8 Wh on its own, 7,884.8 Wh with a B500K: about a day of fridge and router power alone, or three and a half days with the battery.
- 3,840 W at 120 V and 240 V: runs large appliances and 240 V loads at the same time, within that total.
- LiFePO4, 6,000 cycles to 80%: one of the highest cycle ratings we've seen. See LiFePO4 vs lithium-ion.
- 83.8 lb: on its own it's movable; with the 99.2 lb B500K it stays put.
- Expandable: B300K and B500K batteries, up to 58 kWh with two to three units.
Spec sheets are easy to misread; watts vs watt-hours explains which number answers which question.
Charging speed
80% in about 40 minutes
Bluetti quotes 80% in about 40 minutes, but doesn't state the wall input watts behind that figure.
Bluetti quotes up to 4,000 W of solar with its SolarX 4K add-on; it doesn't give a figure for the unit on its own. See solar panel sizing.
Capacity and real runtime
About a day alone, three and a half days with a B500K
Estimated runtimes: Apex 300 alone and with one B500K
- Fridge + Wi-Fi router, Apex 300 alone30 h
- Fridge + Wi-Fi router, with B500K3.5 days
- CPAP, no humidifier, DC cord, with B500K8.6 days
With the B500K, a fridge and router run for about three and a half days. Try your own loads in the runtime calculator, and see how long a power station runs a refrigerator.
Output: what it can and can't run
3,840 W at 120 V and 240 V, with RV outlets
It supplies 120 V and 240 V at the same time, up to 3,840 W combined, across six AC outputs. Bluetti lists 30 A and 50 A RV outlets for connecting a rig directly.
Bluetti quotes 7,680 W of "lifting power" but doesn't label it as surge, so check motor startups such as a well pump against the 3,840 W rating. It won't run several large appliances at once.
Backup (UPS) and app
0 ms or 20 ms, depending on the mode
Bluetti rates switchover at 0 ms or 20 ms depending on the mode. With a transfer switch installed by a licensed electrician, it can take over selected home circuits. See using a power station as a UPS.
It works with the Bluetti app.
How it compares
Against other home backup stations
| Spec | Bluetti Apex 300 | EcoFlow Delta Pro 3 | Jackery Explorer 5000 Plus |
|---|---|---|---|
| Capacity (Wh) | 2764.8 | 4096 | 5040 |
| AC output, continuous (W) | 3840 | 4000 | 7200 |
| AC charge time | 80% in about 40 min (input not stated) | 0–80% in about 50 min (input not stated) | 1.7 hr (fastest mode, per Jackery) |
| Max solar input (W) | Not stated for the unit alone (4,000 W with SolarX 4K add-on) | 2600 | 4000 |
| Weight (lb) | 83.8 | 113.5 | 134.5 |
| Warranty (years) | Not stated | 3 + 2 with app registration | 5 + 2 optional |
| Price | Check price | Check price | Check price |
- EcoFlow DELTA Pro 3: more capacity on its own (4,096 Wh) and 10 ms switchover, but 4,000 W.
- Jackery Explorer 5000 Plus: 5,040 Wh and 7,200 W at 120/240 V, with 0 ms switchover and a 5-year warranty.
- Anker SOLIX F3800 Plus: 6,000 W at 120/240 V with a TT-30 RV outlet, expandable to 53.8 kWh.
- Anker SOLIX S5000: 5,024 Wh and 4,500 W at 120/240 V in 97 lb, with a 10 ms switchover and expansion to about 30 kWh.
Who should buy it
And who should look elsewhere
Good fit: RV owners who want 30 A or 50 A outlets, and homeowners who want 240 V backup and plan to add batteries over time.
Look elsewhere if: you want a clearly stated warranty and surge rating, or more output; the Explorer 5000 Plus suits that better. For a fridge and router only, see the best portable power stations for home backup.
In our buying guides, the Apex 300 is best lighter RV station in Best Portable Power Station for RV.
FAQ
How much capacity does the Apex 300 with a B500K have?
7,884.8 Wh: 2,764.8 Wh in the Apex 300 plus 5,120 Wh in the B500K.
Can the Apex 300 power an RV?
Yes. Bluetti lists 30 A and 50 A RV outlets, within its 3,840 W output.
Can it run 240 V appliances?
Yes, from a single unit, up to 3,840 W combined across 120 V and 240 V.
How long will it run a fridge?
About 29 hours on its own, or about 84 hours with one B500K, for a fridge and router.
Does the Apex 300 work as a UPS?
Yes. Bluetti rates switchover at 0 ms or 20 ms, depending on the mode.
