The BLUETTI Apex 300 is a 2,764.8Wh portable power station with a 3,840W inverter that does two things the smaller units we have tested cannot: it puts out 240V from a single box, and it lets you cap how much power it pulls from the wall, in 1A steps, while the battery covers whatever the connected equipment needs beyond that. Those two features move it out of the camping and outage-backup category and into the lab and home office, where the problem is more often a 20A circuit shared by two workstations than a storm.
Principais lições
- 240V from one unit: a dual-inverter design feeds a NEMA 14-50R at 120/240V alongside four 20A outlets and a TT-30R, with 3,840W shared across them, where earlier units we tested needed a second station and a bridging cable to reach 240V.
- A programmable wall limit: grid draw can be capped from 1A to 50A in 1A increments, and in our test two Dell Pro Precision 9 T2 workstations ran behind a 700W limit with the battery absorbing the peaks, which keeps a shared 15A or 20A circuit under its 1,440W or 1,920W continuous rating.
- 16ms to battery: the Quarch capture showed a 16ms transfer from utility to battery at both a 100W idle and a 700W load in the 20ms (120V) mode, with a clean return to line power; BLUETTI’s 0ms figure applies to two front outlets in 240V mode on a 120V input, which we did not capture.
- 2.39 kWh entregues, 3.30 kWh para recarregar: the single unit returned 86 percent of its 2,764.8Wh rating at the AC outlets; with two B300K packs attached the stack delivered 7.38kWh of an 8,294.4Wh rating (89 percent) and took 10.01kWh to recharge.
- $1,499 and 83.78 pounds: five-year warranty, 1,800W standard AC input or 3,840W through the optional 50A cord, up to six B300K packs per unit, and $1,099 per B300K.
The Apex 300 sits above the 300 Elite e 400 Elite in BLUETTI’s lineup on output and below the Elite 400 on battery, and the design priorities are different. The Elite units are sealed single-inverter stations with a fixed set of 120V outlets. The Apex 300 is built as the head of a modular system: a battery expansion port on one end takes up to six B300K packs for a 19,353.6Wh stack, a 50A input/output port on the side handles high-current charging and pass-through, and the inverter can be charged at 120V while it supplies 240V loads, or charged at 240V while it feeds 120V equipment.
That flexibility is what makes it interesting for the kind of equipment we run. Workstations such as the DGX Station class systems are designed to draw close to the ceiling of a 15A or 20A circuit, and putting two of them on one circuit means something has to give.
With the Apex 300 between the wall and the equipment, the wall sees no more than the limit you set, and the battery supplies the rest until the load falls back under it. The same unit also serves as a UPS for everything plugged into it, which replaces the small lead-acid unit under each desk with one battery for the room.
BLUETTI Apex 300 Pricing and Warranty
The Apex 300 lists at $1,499 at the time of review, down from a $1,699 list, with a five-year warranty. The B300K expansion battery is $1,099 alone and $2,599 bundled with the head unit, and carries a three-plus-one-year warranty. The 50A AC charging cable, the Hub D1 that adds the USB and DC outputs ($299), the Charger 1 alternator charger ($219), and the solar bundles are all separate. BLUETTI’s page lists the Apex 300 as shipping from early December, so check availability if the purchase is time-sensitive.
Plan the total around what the unit will do. A single Apex 300 covers the UPS and power-limiting use cases in this review by itself; the expansion packs are for runtime, and the 50A cord is for charging speed and for bypass loads above the 1,800W the standard cord allows.
BLUETTI Apex 300 Specifications
The figures below come from BLUETTI’s US product page for the Apex 300 as of November 5, 2026. The USB-C, USB-A, cigarette-lighter, DC5521, and Anderson outputs require the optional Hub D1 and are listed as BLUETTI lists them.
| Especificação | BLUETTI Apex 300 |
|---|---|
| Bateria | |
| Capacidade da bateria | 2,764.8Wh (51.2V, 54Ah) |
| Química da bateria | LiFePO₄ (Fosfato de Ferro de Lítio) |
| Ciclo de Vida | Mais de 6,000 ciclos para 80% da capacidade original |
| Expansão | Up to 6x B300K / B300S / B300 per unit (B300K: 2,764.8Wh, 65.04 lbs, $1,099) |
| Potência de saída | |
| Saída CA contínua | 3,840W Max. total, 120V/240V, pure sine wave |
| Poder de elevação | 7,680W |
| Ignorar | Up to 12kW (BLUETTI figure, via the 50A input/output port) |
| portas de saída | |
| Tomadas AC | 4x AC outlets (20A, NEMA 5-20R) 1x NEMA TT-30R (120V/30A) 1x NEMA 14-50R (120/240V, 50A) 1x AC input/output port (P050A, 50A) |
| USB-C | 2x 100W Max. (requires Hub D1, 700W) |
| USB-A | 2x 15W, 5V/3A (requires Hub D1) |
| Saída DC | 2x 12V/10A or 24V/5A cigarette lighter 2x 12V/10A or 24V/5A DC5521 1x 12V/50A or 24V/25A Anderson (all via Hub D1) |
| Carregamento | |
| AC Input (standard cord) | 120V, 50/60Hz, 15A Max., 1,800W Max. with bypass |
| Carregamento Turbo | 3,840W Max. (80% in 45 minutes at 59°F to 77°F) |
| Entrada Solar | 2x 1,200W, 12 to 60VDC, 2x 20A |
| Entrada Máxima | 3,840W (Apex 300 alone) 6,240W (Apex 300 with one to six B300K) |
| Geral | |
| Dimensões (L x W x H) | 20.67 12.87 x x 12.6 em (x 525 327 320 x mm) |
| Peso | 83.78 lbs / kg 38 |
| Temperatura de carregamento | 32°F a 104°F / 0°C a 40°C |
| Temperatura de descarga | -4 ° F a 104 ° F / -20 ° C a 40 ° C |
| Tempo de comutação do UPS | 0ms or 20ms (BLUETTI figures) |
| Conectividade de aplicativos | Wi-Fi e Bluetooth |
| Garantia | 5 Anos |
Construir e projetar
The Apex 300 is a wide, low box at 20.67 x 12.87 x 12.6 inches (525 x 327 x 320mm) and 83.78 pounds (38kg), which puts it 2 pounds under the Elite 400 with none of the Elite 400’s wheels. BLUETTI sells a folding trolley as an accessory, and the shape is meant for stacking: a B300K pack has the same 20.67 x 12.87 inch footprint at 8.23 inches tall, so the head unit sits on top of its batteries.
For a unit that will live under a bench or beside a rack, that is the right shape, but moving 84 pounds by the molded handles at each end is a two-person job.
The front is simpler than the spec sheet suggests. Four 20A outlets sit in the center, labeled as two 1,920W pairs under a 3,840W total, with the display above them. To the left of the display is the voltage selector, which switches the unit between 120V and 240V output, with ECO and AC buttons beside it. To the right are a charging mode selector for silent, auto, and turbo charging and the power button, so the settings that matter day to day are reachable without opening the app.
The voltage selector follows from how household 240V works in North America, which is split-phase: two 120V lines that each measure 120V to neutral and 240V to each other. The Apex 300 carries two inverters, one per line, which is how a single unit produces both lines and the 240V between them. In 120V mode every outlet is 120V. In 240V mode the 14-50R on the side panel carries both lines plus neutral and ground, so it can feed a 240V load or 120V loads on either line, depending on how the outlet is wired downstream, while the four front outlets stay live at 120V.
The high-current connections are on one end of the unit, under a molded handle and the fan grille. Across the top are the grounding terminal, the standard 120V 15A AC input, and a 20A circuit protector. Below them are three covered outlets: the P050A port, a 50A input/output connection rated for 120V or 240V that takes BLUETTI’s 30A or 50A AC charging cables, a TT-30R rated at 120V and 30A, and the NEMA 14-50R rated at 120/240V and 50A.
Through the P050A port the unit charges at up to 3,840W, and in bypass it can pass loads well above what the 15A inlet supports; BLUETTI quotes a 12kW bypass figure for EV charging and HVAC through that port. The 50A cable is a heavy, stiff cord with a 14-50P plug on the wall end, and it can be connected alongside the standard 15A cord. The opposite end of the unit carries the battery expansion port and the DC input for solar and the car cable under a second grille, with a removable dust filter over the intake.
What the Apex 300 does not have is any DC output on the unit itself. The USB-C, USB-A, cigarette-lighter, DC5521, and Anderson connections all live on the optional Hub D1, a $299 box rated at 700W that plugs into the unit. For a station aimed at AC loads, that is a defensible choice, and it keeps the front panel to the outlets that matter at this power level. Buyers who expect to charge a laptop from a USB-C port on the station should budget for the hub.
Usabilidade e Interface
The BLUETTI app connects over Wi-Fi or Bluetooth and shows the same power-flow view we saw on the Elite 400: grid, solar, DC, and AC in and out, state of charge, and estimated runtime at the current load. The Apex 300 adds the controls that matter for this unit. The grid input limit sets the maximum current the unit will draw from the wall, from 1A to 50A in 1A steps depending on which cord is connected, while the output voltage is set with the selector on the front panel.
The grid input limit in the BLUETTI app, set here to the 50A maximum
The app’s charging modes work as they do on the Elite series, with silent charging keeping the fans down at the cost of speed and turbo running them up. Extreme Weather Alert, which tops the battery off ahead of a forecast outage, carries over.
Grid Information on a 240V input: 717W on L1 and 1,101W on L2
The input limit interacts with the voltage mode, and on a 120V supply with the unit in 120V mode the amp limit applies to that single line, which is the simple case. On a 240V supply with the unit still in 120V mode, the limit still applies to one line only: the unit charges through a single inverter and draws from just one leg of the incoming 240V, and it will not pull from both legs until the output is switched to 240V mode.
In the Grid Information screen above, the Apex 300 is set to 240V output on a 240V input, and the app reports the load on each line separately, 717W on L1 and 1,101W on L2.
The reason is the split-phase arrangement described above. In 120V mode only one of the two inverters is doing the charging, regardless of what is plugged into the input; in 240V mode the unit spreads its charging across both lines. Anyone charging from a 240V circuit through the 50A port should set the output to 240V so the draw is balanced across both legs.
The power-flow view while charging from the grid at 4.9kW with 1.8kW out on AC
In environments where you are able to supply 240V power to the Apex 300, you can use smaller breakers for the same wattage out. 30A from a single 120V line, for example, is 3,600W, but a two-pole 30A breaker at 240V gives you 7,200W.
Teste de energia
The 2,764.8Wh rating is the nominal battery capacity, and the energy available at the AC outlets is lower once the inverter and the unit’s electronics take their share. For discharge testing we run a large blower fan as a steady inductive load with our power meter between the unit and the fan, and log the delivered energy until the unit shuts down. We then recharge from 0 to 100 percent and log the draw from the wall.
The single Apex 300 delivered 2.39kWh before it powered off, 86 percent of its rating, and took 3.30kWh from the wall to refill, a round trip of about 72 percent. With two B300K packs attached, the 8,294.4Wh stack delivered 7.38kWh, 89 percent of the combined rating, and took 10.01kWh to recharge, a round trip near 74 percent. The expansion packs return a slightly larger share of their capacity than the head unit alone, since the inverter overhead is spread over three batteries.
At the 740W workstation load we used in the Elite 400 review, 2.39kWh works out to a little over three hours, and the three-battery stack to about ten. At a 100W networking load the single unit covers about 24 hours.
UPS Switchover
For the backup test we put a Dell Pro Precision 9 T2 workstation on the output through our Quarch power analyzer and cut the incoming AC. With the workstation idle at roughly 100W, the transfer from utility to battery measured 16ms between the cursors on the capture, and the return to line power was clean, with a slightly wider wave and a small voltage rise on the first cycle as the inverter resynchronized. Power never dropped on the return to line; the capture shows only some noise during that period.
Repeating the test with the workstation under a benchmark load near 700W gave the same 16ms transfer with a slightly dirtier waveform for the first cycles on either side.
BLUETTI advertises a 0ms switchover and a 20ms mode, and which one you get depends on the voltage mode and the outlet. Our captures were taken in 120V mode, which is the 20ms path, and the 16ms we measured at the outlets is inside that figure and in the range of the Elite 300’s 8ms and the Elite 400’s 6ms to battery, if slower than both.
On return to power, both under a 100W load and under a heavier 700W load, the unit had no interruption in power output, just a slightly dirty signal for a single waveform. The workstation rode through both transitions in both tests, and the only equipment we could think of that might notice a 16ms gap is something with no input capacitance, such as an old CRT.
The 0ms figure on line to battery comes from the dual-inverter design. With the unit in 240V mode on a 120V input, the wall supplies only one of the two lines, so the unit generates the second 120V line itself through double conversion. The two left outlets on the front ride on that generated line and switch with no gap, while the two right outlets are fed through bypass from the wall and see the same short delay we measured. On a 240V input in 240V mode, both inverters run in bypass and every outlet sees the subtle delay.
Capping the Wall: Two Workstations on One Circuit
The test that sets the Apex 300 apart is the grid input limit. A 20A circuit at 120V is 2,400W, and the 80 percent rule for continuous loads brings the safe figure to 1,920W; a 15A circuit is 1,800W and 1,440W. Workstations built around that ceiling, such as the DGX Station class systems, leave no room for a second one on the same circuit, and a pair of them peaking together trips the breaker. The Apex 300 lets you set the most it will pull from the wall, and when the connected load goes above that, the inverter draws the difference from the battery.
We set the limit to 700W with two Dell Pro Precision 9 T2 workstations on the output and logged the draw on the charging cable with the Quarch analyzer. With both systems idle the wall draw sat near 220W. When the benchmark started and the systems were drawing about 1,100W together, the draw climbed through the limit with a brief peak near 880W before the limiter clamped it, then held between 680 and 700W for the rest of the run while the workstations drew more than that from the outlets, the battery supplying the excess. When the load dropped, the wall draw fell back to around 300W.
The battery cannot carry that difference indefinitely, so this is a buffer for peaks; it will not run 3,000W of equipment on a 15A circuit all day. For two systems that cross the limit for minutes at a time, it keeps the circuit under its rating and the workloads online, and the same arrangement scales up to the inverter’s 3,840W ceiling with a 240V load on the 14-50R. Two GB300 workstations on one 20A circuit is the case we built the test around, and the Apex 300 is the first portable unit we have tested that handles it without a transfer switch or a second circuit.
| Especificação/Teste | BLUETTI Apex 300 | Apex 300 + 2x B300K | BLUETTI Elite 400 | BLUETTI Elite 300 |
|---|---|---|---|---|
| Capacidade nominal da bateria | 2,764.8Wh | 8,294.4Wh | 3,840Wh | 3,014.4Wh |
| Saída CA contínua | 3,840W (120V/240V) | 3,840W (120V/240V) | 2,600W (120V) | 2,400W (120V) |
| Energia CA fornecida medida | 2.39kWh (86%) | 7.38kWh (89%) | 3.07kWh (80%) | 2.67kWh (89%) |
| Energia de recarga medida | 3.30kWh | 10.01kWh | 3.96kWh | 3.49kWh |
| Transferência medida para a bateria | 16ms | Não medido | 6ms | 8ms |
| Transferência medida para a concessionária | 0ms | Não medido | 14.8ms | 8.25ms |
| Grid Input Limit | 1A to 50A, 1A steps | 1A to 50A, 1A steps | Corrente de carregamento apenas | Corrente de carregamento apenas |
| Peso | lbs 83.78 | lbs 213.86 | lbs 85.98 | lbs 57.98 |
| Preço em revisão | $1,499 | $3,697 | $1,399 | $1,199 |
The Apex 300 returns a larger share of its rating than the Elite 400 (86 against 80 percent) on a smaller battery, so the two deliver 2.39kWh and 3.07kWh from 2,764.8Wh and 3,840Wh. Where the Apex 300 pulls ahead is everything after the battery: 3,840W against 2,600W, 240V on the 14-50R, the 50A port, and the input limit. The Elite 400 remains the better pick for someone who wants the most runtime from one box with wheels under it. The three-battery Apex stack at $3,697 delivers 7.38kWh, 2.4 times the Elite 400, for 2.6 times the price and 2.5 times the weight.
Conclusão
The BLUETTI Apex 300 is the first portable power station we have tested that belongs in the lab for a reason other than keeping the lights on. Its 3,840W dual-inverter output supplies 240V from a single unit through the 14-50R, and the grid input limit turns it into a power buffer that holds a shared circuit under its rating while the battery covers the peaks.
In our test, two Dell Pro Precision 9 T2 workstations ran a benchmark behind a 700W wall limit with the draw on the charging cable clamped between 680 and 700W after a brief peak near 880W. For two GB300 workstations on one 20A circuit, or a bench where the equipment outgrew the wiring, that is a capability no transfer switch or small UPS offers.
On the UPS side, the transfer to battery measured 16ms at idle and at a 700W load, inside BLUETTI’s 20ms figure though slower than the 8ms and 6ms we saw on the Elite 300 and Elite 400, and the workstation never noticed. BLUETTI’s 0ms figure applies to the two left front outlets when the unit runs in 240V mode on a 120V input, a path we did not capture this round, and for a system where an interrupted shutdown would be costly, those outlets or a dedicated online UPS remain the conservative choice.
On capacity, the single unit delivered 2.39kWh of its 2,764.8Wh rating and the three-battery stack 7.38kWh of 8,294.4Wh, with recharge energy of 3.30kWh and 10.01kWh.
The trade-offs are weight and modularity: at 83.78 pounds with no wheels and only the molded handles at each end, the Apex 300 is meant to be placed and left, and every DC output, including USB-C, requires the $299 Hub D1. The expansion packs and the 50A cord are the right accessories for runtime and charging speed, and they add up quickly: the head unit with two B300K packs is $3,697 before the cord.
At $1,499 with a five-year warranty, the Apex 300 is the unit to buy when the problem is the circuit, not the outage. It replaces a lead-acid UPS under each desk with one battery for the room, it gives a workstation pair the headroom a single circuit cannot, and it scales to 19kWh of storage if runtime becomes the next problem. For pure backup runtime on wheels, the Elite 400 is the easier unit to live with; for anything that draws 240V or needs the wall held to a number, the Apex 300 is the one.
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