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Price checked: November 2026
Verdict up front
Winner for most homeowners: the EcoFlow DELTA Pro 3.
This is a research-based comparison, not a hands-on test. We have not tested either unit. We compared the manufacturers’ published US specifications and US store prices, checked in November 2026, and did the arithmetic shown below.
Buy the DELTA Pro 3 if you want the stronger single box. It starts with 4,096Wh, about 48% more than the Apex 300’s 2,764.8Wh, delivers 4,000W to the BLUETTI’s 3,840W, and includes USB and 12V DC outlets on the unit itself. For a fridge, lights, internet, and phones through the night, that extra capacity in one unit is the difference that matters most, and why it wins despite costing more.
Buy the Apex 300 if value and expansion matter more than out-of-the-box capacity. At $1,499 it was $1,300 less when we checked, it is about 30 lb lighter, its battery is rated for more cycles, and one unit accepts more expansion batteries.
EcoFlow DELTA Pro 3: [CHECK PRICE – LINK PENDING]
BLUETTI Apex 300: [CHECK PRICE – LINK PENDING]
Why these two models
Older comparisons pair the original EcoFlow DELTA Pro with BLUETTI’s AC300 or AC500, but those are no longer the cleanest flagship match. EcoFlow’s current DELTA Pro-class model on its US store is the DELTA Pro 3. BLUETTI’s comparable is the Apex 300, which BLUETTI describes as building on the AC300 and AC500. Unlike the AC300/AC500, which are inverter units with no battery of their own, the Apex 300 is a single unit with its own battery, 120V/240V output, and expansion batteries, so base unit to base unit is a fair pairing.
Both aim at the same job: keeping essential circuits and appliances running during an outage, without a permanently installed system, and both can connect to a home through a transfer switch or inlet setup installed by a qualified electrician.
At a glance
| Brand / Model | Capacity (Wh) | Continuous AC output (W) | Expandability | Battery chemistry | Weight | Price (US store, Nov 2026) |
|---|---|---|---|---|---|---|
| EcoFlow DELTA Pro 3 | 4,096Wh | 4,000W (8,000W surge) | To 12,000Wh per unit with 2 extra batteries | LFP (LiFePO4) | 113.54 lb (51.5 kg) | $2,799 |
| BLUETTI Apex 300 | 2,764.8Wh | 3,840W (7,680W lifting power for resistive loads) | To 19,353.6Wh per unit with 6 x B300K batteries | LiFePO4 (LFP) | 83.78 lb (38 kg) | $1,499 |
Notes: BLUETTI’s “lifting power” is not a surge rating. It is 7,680W for resistive loads such as heaters running below rated power. EcoFlow lists 8,000W surge separately from its 4,000W continuous output and 6,000W X-Boost mode. Prices are standalone base-unit prices, with no panels or extra batteries.
Capacity and output: the single-box gap
Capacity decides how long the lights stay on. The DELTA Pro 3 holds 4,096Wh. The Apex 300 holds 2,764.8Wh. The difference is 1,331.2Wh, or about 48% more energy in the EcoFlow before either system is expanded.
For scale, using a conservative 85% planning factor (no battery delivers all its rated energy): at a steady 250W load, roughly a cycling fridge plus lights, a router, and phone charging, the DELTA Pro 3 works out to about 13.9 hours (4,096 x 0.85 / 250) and the Apex 300 to about 9.4 hours (2,764.8 x 0.85 / 250). That is our arithmetic on rated capacity, not a measured runtime, and your result will vary with load and temperature. On those figures, the EcoFlow is more likely to cover a full overnight outage without a recharge.
Output is close: a 160W edge for the EcoFlow. Both suit most single household appliances and both offer 120V and 240V from one unit, which a well pump and some dryers require. One difference is verified in EcoFlow’s FAQ: the DELTA Pro 3 cannot output 120V and 240V at the same time; pressing the 240V button turns the 120V outlets off. Secondary sources say the Apex 300 can run both simultaneously, but we could not confirm that on the BLUETTI US page we fetched, so it is [UNVERIFIED]. Confirm with BLUETTI if that matters to you.
Expandability and charging
Here the BLUETTI is stronger. One Apex 300 accepts up to six B300K batteries, taking a single unit to 19,353.6Wh, and BLUETTI describes a three-unit parallel system reaching 58,060.8Wh and 11,520W. One DELTA Pro 3 accepts up to two extra batteries, for 12,000Wh per unit. EcoFlow lists larger system figures with its Smart Home Panel 2 and generators, but per unit, BLUETTI has the higher ceiling and the more flexible battery path.
BLUETTI also listed an Apex 300 plus one B300K bundle at $2,599 when we checked. That gives 5,529.6Wh, more capacity than a base DELTA Pro 3, for $200 less. The trade-off is two boxes with a combined weight well above the EcoFlow’s single unit.
Charging is broadly comparable. The DELTA Pro 3 accepts up to 2,600W of solar across two ports and EcoFlow claims 0 to 80% in 50 minutes under its fast-charging conditions. The Apex 300 accepts up to 2,400W of solar directly, and BLUETTI lists AC charging up to 3,840W in Turbo mode. An optional SolarX 4K accessory can raise its solar input further, at extra cost. These are manufacturer claims, not figures we measured.
Ports, portability, and daily use
The EcoFlow is the more complete box on its own. Its specifications list USB-A and USB-C ports, a DC5521 output, and a 30A Anderson port on the main unit. The Apex 300 takes the opposite approach: BLUETTI states in its own FAQ that the main unit has no USB or 12V ports. To get USB, 12V/24V DC output, and a 50A Anderson connection, you need the optional Hub D1 module, sold separately. For charging phones and running small DC devices in an outage without an add-on, that is a practical EcoFlow advantage.
Neither unit is light: 113.54 lb for the EcoFlow, 83.78 lb for the BLUETTI. The roughly 30 lb difference matters if you will move it between floors or into a vehicle, though the EcoFlow has wheels and a handle. For a unit that sits in a garage, weight matters less than capacity. Plan on two people, or a trolley, for either.
Battery life and cost per watt-hour
Both use lithium iron phosphate chemistry. BLUETTI rates the Apex 300 at 6,000 or more cycles to 80% of original capacity; EcoFlow rates the DELTA Pro 3 at 4,000 cycles to 80%. Both carry a 5-year warranty. If you cycle the battery daily, the BLUETTI’s higher rating is a meaningful advantage. If it will sit charged for occasional outages, cycle life is less likely to end its useful life.
On price per unit of storage, the BLUETTI is clearly cheaper: about $0.54 per Wh ($1,499 / 2,764.8Wh) against about $0.68 per Wh for the EcoFlow ($2,799 / 4,096Wh). The EcoFlow premium buys a larger battery in a single, self-contained unit, not cheaper energy.
Pros and cons
EcoFlow DELTA Pro 3
Pros
- Largest base capacity in this pairing: 4,096Wh in one unit
- Highest continuous output here: 4,000W, with an 8,000W surge rating
- USB, 12V DC, and Anderson outputs built into the main unit
- Higher built-in solar input: 2,600W
- 10ms UPS switchover listed by EcoFlow
Cons
- Most expensive base unit here: $2,799 when checked
- Heaviest unit here: 113.54 lb
- Lower per-unit expansion ceiling: 12,000Wh with two extra batteries
- Lower cycle rating: 4,000 cycles to 80%
- Cannot output 120V and 240V at the same time, per EcoFlow’s FAQ
[CHECK PRICE – LINK PENDING]
BLUETTI Apex 300
Pros
- Lowest base price here: $1,499 when checked, and the best price per Wh
- Higher cycle rating: 6,000 or more cycles to 80%
- Lighter: 83.78 lb, about 30 lb less than the EcoFlow
- Higher per-unit expansion ceiling: 19,353.6Wh with six B300K batteries
- Apex 300 plus one B300K bundle ($2,599 when checked) beats the EcoFlow base unit on capacity for less money
Cons
- Smaller base capacity: 2,764.8Wh, about 48% less than the EcoFlow
- No USB or 12V DC ports on the main unit; Hub D1 module required, sold separately
- Slightly lower continuous output (3,840W) and built-in solar input (2,400W)
- Best results depend on buying into its modular accessory system
[CHECK PRICE – LINK PENDING]
Which one fits your home?
Choose the DELTA Pro 3 if you want one unit that covers an overnight outage on essentials with the least planning. Choose the Apex 300 if you would rather start for less, grow battery by battery, or use the B300K bundle for more total capacity for less money in a two-box setup. Our winner remains the DELTA Pro 3: for the core backup job, base-unit capacity is what homeowners feel first, and EcoFlow avoids the extra module for everyday charging ports.
FAQ
Can either unit power a whole house?
Not a whole house at full load, on its own. Both can power selected essential circuits through a transfer switch or inlet connection, and both expand with extra batteries and multiple units. Have a qualified electrician assess your panel and loads.
How long will each run a refrigerator?
It depends on the fridge’s consumption and what else is plugged in. Using the 85% example above, a 250W average combined load gives about 13.9 hours for the DELTA Pro 3 and 9.4 hours for the Apex 300. A fridge alone would run longer on either. These are calculations, not test results.
Do I need to buy expansion batteries right away?
No. Both work as sold and can be expanded later: up to two extra batteries per EcoFlow unit, up to six B300K per BLUETTI unit. Check that a battery you plan to buy later is still sold and compatible when you need it.
What is the difference between surge, X-Boost, and lifting power?
They are not interchangeable. A surge rating is a short burst for starting motors. EcoFlow’s X-Boost and BLUETTI’s lifting power are modes that let the unit run certain higher-rated resistive appliances, such as heaters, at reduced power. Neither mode turns a 3,840W or 4,000W inverter into a larger continuous inverter.
How fast do they switch over in an outage?
EcoFlow lists a 10ms UPS switchover for the DELTA Pro 3. BLUETTI’s Apex 300 switchover time is [UNVERIFIED] in this comparison: secondary sources cite different figures depending on the operating mode, and we could not confirm a single figure on the BLUETTI US product page we fetched. Confirm the current figure with BLUETTI if switchover time for specific equipment is critical to you.
Sources
Price checked: November 2026. Prices are US store prices for the standalone base unit unless a bundle is named; specifications are the manufacturers’ published figures.
- EcoFlow DELTA Pro 3: price $2,799; 4,096Wh; expansion to 12kWh per unit; 4,000W output, 6,000W X-Boost, 8,000W surge; 2,600W solar; LFP; 4,000 cycles to 80%; 10ms UPS; 51.5 kg (113.54 lb); 5-year warranty; built-in USB/DC/Anderson outputs; 120V and 240V not simultaneous (FAQ): https://us.ecoflow.com/products/delta-pro-3-portable-power-station
- BLUETTI Apex 300: price $1,499 (list $1,699); 2,764.8Wh; 3,840W output; expansion to 19,353.6Wh per unit with 6 x B300K and 58,060.8Wh in a 3-unit system; 2,400W direct solar; Apex 300 + B300K bundle $2,599 / 5,529.6Wh: https://www.bluettipower.com/products/apex-300-home-battery-backup
- BLUETTI Apex 300: weight 83.78 lb (38 kg); LiFePO4; 6,000+ cycles to 80%; 5-year warranty; no USB or 12V on main unit, Hub D1 required (FAQ): https://www.bluettipower.com/products/apex-300-rv-power-solution
- BLUETTI Apex 300: price $1,499 / list $1,699 also shown at: https://www.bluettipower.com/collections/bluetti-apex-series