BLUETTI Apex 300 + 2×B500K review

The BLUETTI Apex 300 + 2×B500K package is the highest-capacity single-Apex arrangement among the six reviewed offers in this family. It pairs one 2,764.8 Wh Apex 300 battery with two B500K modules rated at 5,120 Wh each: 13,004.8 Wh by addition, or roughly 13 kWh of nameplate capacity. It still uses one Apex inverter rated for 3,840 W continuous AC. Treat the large capacity number as longer storage reserve, not permission to power a larger load.

Capacity comes with a large handling burden

The B500K manual lists about 99.2 lb per expansion unit, and the Apex is about 83.8 lb. Those three major components total roughly 282.2 lb before cables or packaging. That figure should determine whether the package belongs in your plan at all. Measure the intended space, door and stair route; consider where heat can dissipate and how the equipment can be moved safely. This is a multi-piece stationary backup system, not a portable kit in the ordinary carry sense.

13,004.8 Wh is a capacity sum of the exact components’ nameplate ratings. It is not equivalent to AC energy delivered to appliances. The manual’s output limits and your actual load profile determine how long the system can serve essential equipment. The one Apex inverter remains rated at 3,840 W. If a sump pump, compressor, microwave or other load needs more continuous power or has a large start-up demand, the additional B500K batteries do not resolve that mismatch. Do not treat the manufacturer’s pure-resistive Power Lifting ceiling as a general motor rating.

What is in the selected U.S. package

The selected variant is Shopify option 6911965e4abc44066f33eb6c / 47914968219867. The manufacturer’s in-box list shows one Apex 300, two B500K batteries, an AC charging cable, a car charging cable, grounding screw, two CA90 battery connection cables and one manual/warranty set. There is no solar panel, Hub A1 or second inverter in this option. The modules connect as expansion batteries; they are not separate AC power stations.

BLUETTI’s Apex manual supports connecting B500K modules through the specified CA90 expansion cable and lists multi-battery configurations. Follow cable and placement instructions rather than inferring layout from a product render. The B500K is heavier than the B300K, so two modules can simplify the number of expansion boxes compared with three or more smaller batteries but create more concentrated mass in each piece. A 2×B300K package has about 8,294.4 Wh and around 213.9 lb of main components; it is lighter, but provides less storage. The one-B500K bundle is about 7,884.8 Wh and 183 lb, a smaller storage step with fewer modules to place.

Match the actual outlet mode

The Apex 300 output panel can be set to 120 V or 240 V. Its manual identifies four NEMA 5-20R, TT-30R and 14-50R outlets, plus P050A, and documents per-outlet limits. In 240 V mode, household outlets are limited to 16 A and every two-port group to 1,920 W. Do not assume a 14-50 connector supplies 50 A or that four receptacles can simultaneously deliver 3,840 W each. A 120 V RV TT-30 need must be planned in the supported 120 V configuration. No panel is included here, even though the station has a separate 2,400 W solar input ceiling.

For DC devices, the Apex needs the manufacturer’s documented add-on path; it does not expose ordinary USB or car-style DC ports on its own. If one of those outputs is essential, a smaller all-in-one station may avoid adding another box. If 240 V is essential, select that mode explicitly and check your load current and installation requirements.

How it should rank for your needs

Set the questionnaire capacity floor to about 13,000 Wh only when this large storage arrangement is acceptable. A 13,005 Wh minimum would exceed the component arithmetic here. A strict maximum total-plan weight must include the Apex and both B500K units; anything below about 282.2 lb is incompatible even before connection leads. Since no solar panel is listed, a panel-in-box requirement must exclude the package. It can meet a 3,840 W rated output floor in one-Apex use, but it cannot meet a continuous-output floor above 3,840 W without a separately documented parallel arrangement.

This equipment is IP20: keep it in a dry, protected setting and use manufacturer-approved connections. It is not an improvised household transfer system; never backfeed an outlet. No independent runtime, solar, AC-delivery or appliance-start test is claimed. Sources: the exact U.S. 2×B500K option, Apex support/manual and B500K support/manual.