BLUETTI Apex 300 and B300K: 5.5kWh dual-voltage power station explained

The BLUETTI Apex 300 is a large portable power station, and this set pairs it with a B300K expansion battery for a combined 5,529.6Wh of storage. It is meant for home backup, RVs, cabins and off-grid use where a petrol generator would otherwise be the usual answer. This page explains what the numbers mean and what to plan for.

Capacity and output: watts versus watt-hours

Two figures matter. Watt-hours (Wh) measure how much energy is stored, like the size of a fuel tank. Watts (W) measure how much power can be delivered at once. BLUETTI lists 5,529.6Wh of storage with a 3,840W output and a 7,680W surge figure. That surge figure covers the brief spike some motors, such as a refrigerator compressor or air conditioner, draw when starting.

As a rough guide, a 100W load would run for many hours on this capacity, while a high-draw appliance uses it up much faster. Add up the running watts of what you want to power and divide the stored energy by that figure, allowing for some conversion loss.

120V/240V dual-voltage output

The Apex 300 has six AC outlets and supplies 120V and 240V at the same time. BLUETTI says this allows it to power larger loads such as refrigerators, air conditioners, RV appliances and EV chargers without voltage compromises. Many portable stations offer only 120V, so 240V output is a real difference for larger equipment. Check the voltage and plug type of each appliance you plan to run.

The battery

BLUETTI describes its second-generation LiFePO4 (lithium iron phosphate) battery as lasting 6,000+ cycles to 80% capacity and a 17-year lifespan. LiFePO4 chemistry is generally valued for its long cycle life and stability compared with other lithium types. BLUETTI says the unit is CNAS-certified and passed 33 extreme tests. Lifespan figures are the brand's claims, not guarantees of your own results.

Charging options

The listing describes several ways to recharge:

• Solar: up to 2,400W with the built-in input, and 6,400W when expanded.
• AC wall power: BLUETTI says it reaches 80% in 45 minutes.
• Generator: supported as a backup input.
• Car: a car charging cable is included for slower top-ups.

Actual solar yield depends on panel size, sunshine and angle.

What is in the box

You receive the Apex 300 power station, the B300K expansion battery (shipped separately), an AC charging cable, a car charging cable, a grounding screw and a user manual.

Size and weight

The listing gives 20.7 x 12.9 x 12.6 inches and 83.8 lb (about 38 kg). It is portable in the sense that it can be moved, not carried far, so plan for a wheeled cart, a fixed spot or two-person lifting.

Who it suits

It suits households that want quiet backup power during outages, RV and cabin owners wanting to run large appliances, and people building a solar setup. Smaller needs such as phones and a laptop don't need a unit of this size.

What to check before you buy

• Your loads: list the running and starting watts of each appliance and compare them with the output and surge figures.
• Voltage and plugs: confirm the outlet types match your appliances.
• Home connection: connecting a power station to home wiring must follow local electrical codes and the manual; use a qualified electrician where required.
• Solar panels: check the input voltage and current limits in the manual before pairing panels.
• Placement: follow the manual on ventilation, temperature and use indoors.
• Weight: check where you will keep it and how you will move it.

The short version

• A portable power station plus B300K expansion battery with 5,529.6Wh of LiFePO4 storage.
• 3,840W output with a 7,680W surge figure and 120V/240V dual-voltage AC.
• Charges from solar, AC, a generator or a car.
• BLUETTI rates the battery at 6,000+ cycles and a 17-year lifespan.
• Weighs 83.8 lb, so plan its location in advance.

Bloiq is reader-supported. Some links may earn us a commission; it never affects what we write. How we make money.