BLUETTI Apex 300 vs EcoFlow DELTA Pro 3

For most buyers choosing BLUETTI vs EcoFlow for essential backup, start with the EcoFlow DELTA Pro 3: its base unit stores more energy and includes USB and DC outputs. Choose the BLUETTI Apex 300 when you need its mixed-voltage outlet arrangement or prefer its B300K expansion path, after checking the outlet limits below. These are US configurations; the recommendation comes from manufacturer documents, with estimated runtimes rather than physical testing.

Quick picks

Compare specifications and all conditions

More backup energy before buying batteries

Our pick

DELTA Pro 3

The deciding tradeoff

Larger base battery; heavier station

Ordinary 120V outlets alongside a 240V appliance

Our pick

Apex 300

The deciding tradeoff

Both remain available in its 240V setting, with reduced socket limits

Similar stored energy in an expanded kit

Our pick

Compare the baskets below

The deciding tradeoff

Apex needs two B300K batteries; EcoFlow needs one matching extra battery

Full comparison table ↔

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Your priority	Our pick	The deciding tradeoff
More backup energy before buying batteries	DELTA Pro 3	Larger base battery; heavier station
Ordinary 120V outlets alongside a 240V appliance	Apex 300	Both remain available in its 240V setting, with reduced socket limits
Similar stored energy in an expanded kit	Compare the baskets below	Apex needs two B300K batteries; EcoFlow needs one matching extra battery

Your priority	Our pick	The deciding tradeoff
More backup energy before buying batteries	DELTA Pro 3	Larger base battery; heavier station
Ordinary 120V outlets alongside a 240V appliance	Apex 300	Both remain available in its 240V setting, with reduced socket limits
Similar stored energy in an expanded kit	Compare the baskets below	Apex needs two B300K batteries; EcoFlow needs one matching extra battery

This page compares the two platforms for the same job. For smaller stations, use our four-brand comparison; for other home systems, see home battery backup.

Base units: capacity and output are different decisions

The Apex US manual and DELTA Pro 3 manual give these figures. Cycle ratings come from the BLUETTI specification data and EcoFlow's manual.

The output ratings are close; the battery capacities are not. Extra batteries add stored energy without adding another station inverter.

• BLUETTI Apex 3002764.8Wh
• EcoFlow DELTA Pro 34096Wh

Source: Manufacturer capacities in the comparison table above

Best starting point: EcoFlow DELTA Pro 3

Buy the Pro 3 first if its base battery covers your outage plan: it avoids buying expansion hardware just to reach the larger starting capacity. Its USB-C ports provide up to 100W each and USB-A up to 18W each; the DC5521 and Anderson outputs share a 378W maximum, per the manual. That makes it our simpler starting basket for a mix of AC and compatible DC devices.

The catch is voltage selection. The manual says enabling the high-voltage AC output disables the low-voltage output, and vice versa. Count the sockets available in your chosen mode before buying. Our EcoFlow backup family guide handles the wider family decision.

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Best for mixed-voltage plug-in loads: BLUETTI Apex 300

Apex makes sense when you want an ordinary 120V load running alongside a 240V load. Its voltage selector retains the 120V sockets in the 240V position, but the manual reduces each 5-20R to 16A, with a 1,920W limit per pair; TT-30R also falls to 16A. The 14-50R supplies split-phase output at up to 16A on battery, within the station's total output ceiling.

Budget the accessory for your actual DC needs. Hub D1's manual documents a separate 700W DC hub with USB-C and selectable 12V/24V outputs. The B300K has a small 12W USB-A output of its own. Neither accessory adds another AC inverter.

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Expanded baskets for roughly the same energy budget

For an approximately 8kWh nominal target, compare these complete AC appliance baskets. Totals below are arithmetic from the makers' component capacities, not usable energy measured at the outlets.

The B300K manual shows Apex expansion and specifies CA90 for Apex/B300K connections. Its US sales page includes a CA90 with the selected Apex battery. The EcoFlow battery manual names the matching station and included cable.

Hub A1 is for parallel Apex stations, not a required part of this single-station basket. BLUETTI's public Apex FAQ still calls some B300K cables P090A, while its B300K manual and current box contents specify CA90 for this pairing. Hub D1's manual names a P090D connector; its product page says P090A. Buy the Apex-specific battery/cable variant and obtain confirmation if the package uses a different name. An extra battery alone, a panel-only package and a station-plus-battery kit are different purchases.

Voltage, bypass and UPS traps

Bypass means AC input and output operate together. Apex's ordinary AC input is limited to 120V, 15A and 1,800W for charging plus bypass; its separate P050A path has different ratings. The page's 12kW bypass headline is not battery inverter output. Its manual gives 20ms switching generally; the 0ms arrangement specifically requires the 240V setting, grid power through the 15A input and the two left AC outlets.

EcoFlow specifies 10ms station UPS transfer. Its US bypass output is 100–120V, although battery output supports split phase. X-Fusion can supplement AC input from the battery up to rated output; that does not turn the wall supply into an unlimited continuous source. The manual says UPS operation requires input exceeding the connected load so the battery can retain charge; it lists bypass input at 15A for up to three hours, then 12A continuous.

For intermittent fridge loads, BLUETTI says to disable ECO mode; EcoFlow says to set AC timeout to never. Otherwise an idle output can shut off.

Same-load runtime estimates: size energy, then check starts

For a controlled estimate, use hours = nominal Wh × 95% × 90% ÷ (load W + 20W). Apex's manual gives 95% depth of discharge, inverter efficiency over 90% and about 20W self-consumption; we conservatively use 90% efficiency. Applying those same allowances to EcoFlow is a comparison assumption, not an EcoFlow efficiency or idle-draw measurement.

For example, Apex at a steady 300W: 2,764.8 × 95% × 90% ÷ (300 + 20) gives about seven hours. The same assumed losses give the Pro 3 4,096 × 95% × 90% ÷ (300 + 20), about eleven hours.

These are scenarios, not appliance-specific promises. Use a fridge's average energy consumption across its cycling period; our refrigerator watts guide explains the measurement. Temperature, reserve settings and actual losses change runtime.

Check starting demand separately. BLUETTI warns that some motors/compressors start at two to four times rated power; its Power Lifting mode is explicitly for resistive heating loads. EcoFlow's surge rating does not establish that your particular pump will start. Obtain the appliance's starting requirement and confirm compatibility with the maker.

1. 1

   Measure your essential loads

   Use energy over time for cycling appliances and add the loads that run together.

2. 2

   Choose the energy basket

   Apply the stated runtime assumptions to your outage duration and leave reserve.

3. 3

   Check starts and connection mode

   Confirm the motor demand, available outlets and supported home connection before ordering.

Solar, recharge and winter limits

Compare the built-in solar inputs, rather than accessory-system headlines:

The Apex charging-mode table makes Turbo relevant to reaching its solar ceiling. SolarX 4K is separate equipment; do not count its contribution as a base-unit feature. EcoFlow's higher-voltage input offers a different array option, but both require checking panel open-circuit voltage, current and the specified solar cable. EcoFlow warns that voltage varies with temperature and actual charging depends on weather and panel angle.

Both temperature ranges distinguish charging from discharging; a battery that can run a load in the cold may still be too cold to charge. The cited B300K and EcoFlow extra-battery manuals also specify temperature limits: check every component where the kit will live. Do not infer a wall-recharge time from maximum solar watts or from a charging headline that assumes different equipment.

Supported home connections and listing evidence

These baskets cover direct appliance use. A house connection adds the approved transfer equipment and its cables, plus a licensed electrician and a permit where required. This is a purchasing decision, not a wiring guide.

BLUETTI's US Apex page names AT1 for essential circuits. EcoFlow's manual describes an inlet with a transfer switch, or Smart Home Panel 2 with its Power Input/Output Cable; remember the station-socket restriction above. Obtain an itemized quote for the exact station, batteries, panel or switch, and connection cable.

EcoFlow's US product-page data claims UL 9540 certification for DELTA Pro 3. BLUETTI's Apex specification data says “UL” without identifying the standard. Neither statement, by itself, verifies the listing scope of every expanded configuration here. UL's guidance explains that an energy-storage system evaluates components together. Ask the maker and electrician for documentation covering the complete proposed combination; this guide has not independently verified those system listings.

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How we choose

We compared official US product data and manuals, checked accessory roles, and calculated both baskets with the same runtime assumptions. The voltage and bypass limits determine our picks before expansion headlines. Manufacturer cycle ratings are not forecasts of years of service; EcoFlow states its conditions, while BLUETTI's cited rating provides less detail. The cable-name conflict is disclosed above. We have not physically tested these systems or independently verified installation approvals.

Verdict

Choose DELTA Pro 3 for the larger starting battery and built-in DC connections. Choose Apex 300 for its mixed-voltage outlet arrangement after checking the reduced limits. At similar expanded capacity, our runtime model produces similar endurance: let the actual outlets, required accessories and documented home connection decide.