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BLUETTI Apex 300 Review: The Cheapest Way Into 240V Battery Backup
By Justin · Updated September 25, 2026
The Apex 300 gives you most of what the big home batteries do for less money. It has 3,840 watts of output, 240V capability, a fast UPS mode, and it expands to a very large system. The trade-off is a smaller starting battery (2,765Wh) and more setup to figure out.
If you already have solar panels, or you plan to build a system over time, it's one of the best deals in home battery backup right now.
Buy it if you want 240V battery backup on a tighter budget, you're comfortable with an app and some setup, and you'll add expansion batteries or solar over time.
Skip it if you want the most runtime out of the box, or the simplest setup possible. The DELTA Pro 3 has about 50% more capacity and fewer quirks.
Apex 300 Specs at a Glance
| Spec | BLUETTI Apex 300 |
|---|---|
| Capacity | 2,764.8Wh, LiFePO4 |
| Cycle life | 6,000 cycles to 80% |
| AC output | 3,840W continuous, pure sine wave. Bluetti advertises 7,680W "lifting power" for motor starts |
| Voltage | 120V and 240V from a single unit |
| AC charging | 1,800W standard at 120V, faster with Bluetti's TurboBoost (AC + solar) |
| Solar input | 2,400W on the built-in inputs, more with the SolarX 4K add-on |
| UPS switchover | 0 ms or 20 ms modes |
| Expansion | Up to 58kWh with B300K / B500K batteries (multiple units) |
| Idle draw | About 20W (measured by The Solar Lab) |
| Weight | About 84 lbs, no wheels (optional trolley) |
| Warranty | 5 years |
Specs from BLUETTI and independent testing as of September 2026. Some of Bluetti's own listings give different solar numbers depending on configuration. Check the exact setup before buying panels.
What I Like
240V for less money
Getting real 240V output from a power station used to cost a lot. The Apex 300 does it from one unit, so you can connect it to a transfer switch and run 240V loads like a well pump. Owners report running AC units, microwaves, and fridges together. For the price, that's hard to beat.
A 0 ms UPS mode
Like the Jackery 5000 Plus, it offers a true zero-gap mode for sensitive gear like computers, CPAP machines, and network equipment. A 20 ms mode is also available if you'd rather save a little efficiency.
Built to grow
Add B300K or B500K expansion batteries, link more units, and you can build up to 58kWh. If you already have solar panels, owners say it's a much cheaper way to get whole-home battery storage than a wall-mounted system.
Lots of charging options, and a long-life battery
You can charge it from the wall, solar, a car, a generator, or a mix. The LiFePO4 cells are rated for 6,000 cycles to 80%, the highest here. That's more than 16 years at one cycle a day.
What I Don't Like
The smallest battery of the big units
2,765Wh is about two-thirds of the DELTA Pro 3's capacity. Owners report very different runtimes, from many hours to about 40 minutes, and that's just the difference between light loads and heavy ones. Under a 3,500W load, it's empty in well under an hour. See the runtime table below.
No wheels
At around 84 pounds (heavier than some listings suggest), it's a two-person lift and has no wheels. Bluetti sells a trolley separately. Plan to set it in one spot and leave it.
Firmware and setup quirks
Owners mention needing firmware updates after purchase, some trouble with solar detection after an update, and expansion and charging setups that take time to figure out. Independent reviewers also criticize Bluetti's accessory pricing and slow, ticket-only support. None of that is a dealbreaker, but it's more work than the Anker or EcoFlow.
Idle draw
About 20 watts at idle, per independent testing. That doesn't sound like much, but it's roughly 480Wh a day, or about a sixth of the battery. Turn off AC output when you don't need it.
How Long Will It Run Your House?
Plan on about 85% of the capacity reaching your appliances, which is what The Solar Lab measured. That's roughly 2,350Wh.
| What's running | Average draw (approx.) | Apex 300 runtime |
|---|---|---|
| Internet + phones + a few LED lights | 75 W | About 31 hrs |
| Fridge + chest freezer + internet + lights | 300 W | About 8 hrs |
| Above + gas furnace blower (cycling) | 550 W | About 4 hrs |
| Window AC (10,000 BTU) running | 1,000 W | About 2.3 hrs |
| 3-ton central AC running | 3,500–4,000 W | About 40 min |
Apex 300 vs Other Home Batteries
| Bluetti Apex 300 | DELTA Pro 3 | Anker F3800 Plus | Jackery 5000 Plus | |
|---|---|---|---|---|
| Capacity | 2,765Wh | 4,096Wh | 3,840Wh | 5,040Wh |
| Continuous output | 3,840W | 4,000W | 6,000W | 7,200W |
| Cycle rating | 6,000 to 80% | 4,000 to 80% | 3,000+ to 80% | 4,000 to 70% |
| Weight | ~84 lbs | ~114 lbs | ~137 lbs | ~134.5 lbs |
| Wheels | No | Yes | Yes | Yes |
Questions People Ask
Does the Bluetti Apex 300 do 240V on its own?
Yes. A single unit supports 240V output, so you don't need a second unit or a hub for 240V.
How much can I expand it?
Up to 58kWh with B300K or B500K expansion batteries and multiple units.
Why do owners report such different runtimes?
It depends on the load. At 300 watts it lasts around 8 hours. At 3,500 watts it lasts under an hour. Check what you're actually running.
Is it heavy?
About 84 pounds with no built-in wheels. Most people treat it as a stationary unit.
How I Put This Review Together
I haven't run this unit myself. This review is based on BLUETTI's published specs, independent test results from The Solar Lab, what owners report, and the runtime math. If I get one in to test, I'll add my own numbers here.
Bottom Line
The Apex 300 is the value pick for 240V battery backup. It has strong output, a zero-gap UPS mode, a long-life battery, and a lot of room to grow. You give up some capacity out of the box, portability, and some polish. If you're building a solar and battery system over time, it's an easy recommendation.