The catch
EcoFlow DELTA 2 Max
It weighs about 50 pounds, so stairs and repeated lifting are harder than the carry handles imply. It supplies 120V and has no native split-phase 240V output.
Side by side
EcoFlow DELTA 2 Max vs BLUETTI Elite 400: DELTA starts lighter and expands, while Elite rolls with more base reserve
Quick verdict
A larger self-contained reserve with wheels points to the Elite 400. If you want something easier to lift that can grow with compatible batteries, the DELTA 2 Max fits.
Before you buy
Why, and what it costs you
Using a common load makes reserves easier to compare
For a steady 300W load, the model gives EcoFlow DELTA 2 Max about 5.5 hours and BLUETTI Elite 400 10.2 hours.
Where this comes from
Hours = nominal Wh × 0.8 / 300W is the formula, with 2048Wh and 3840Wh going in. The 80% factor is a shared planning allowance for unusable energy and conversion losses. It is not a measured efficiency. Idle draw, temperature and the real load will change the runtime.
The catch
BLUETTI Elite 400
Wheels make level ground easy, yet stairs and loading it into a car still mean handling 86 lb.
EcoFlow DELTA 2 Max
- Why pick it
- Lift the base unit with no need for a cart
- Grow through separate battery modules
- The catch
- It weighs about 50 pounds, so stairs and repeated lifting are harder than the carry handles imply. It supplies 120V and has no native split-phase 240V output.
BLUETTI Elite 400
- Why pick it
- Hold more reserve inside a single enclosure
- Wheel it between nearby spots indoors
- The catch
- Wheels make level ground easy, yet stairs and loading it into a car still mean handling 86 lb.
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What this page compares
The Elite 400 is the choice for a larger self-contained reserve on wheels. The DELTA 2 Max is easier to lift and can grow with compatible batteries.
Solar capacity stays put as battery size grows
Which one fits
Pick the situations that sound like you
Lift the base unit with no need for a cart
Elite 400 has wheels for level ground, but DELTA 2 Max at 50 lb is 36 lb lighter than its 86 lb, and that counts when you lift into a vehicle.
- EcoFlow DELTA 2 Max
- Better fit
- BLUETTI Elite 400
- Depends
Hold more reserve inside a single enclosure
Assuming a 300W load and 80% usable energy, the extra capacity adds about 4.8 hours. Beside a fixed appliance, that can count for more than carry weight.
- EcoFlow DELTA 2 Max
- Depends
- BLUETTI Elite 400
- Better fit
The battery has to carry a steady 300W load
Using the common planning assumptions, EcoFlow DELTA 2 Max reaches 5.5 hours and BLUETTI Elite 400 reaches 10.2. Measure the real wattage before you pick an overnight reserve you require.
- EcoFlow DELTA 2 Max
- Depends
- BLUETTI Elite 400
- Depends
I want solar to refill the battery
EcoFlow DELTA 2 Max accepts up to 1000W and BLUETTI Elite 400 accepts up to 1000W. Compare your real panel strings with the voltage and current limits as well as with this total.
- EcoFlow DELTA 2 Max
- Depends
- BLUETTI Elite 400
- Depends
In practice
Differences you will notice
Using a common load makes reserves easier to compare
For a steady 300W load, the model gives EcoFlow DELTA 2 Max about 5.5 hours and BLUETTI Elite 400 10.2 hours.
How we worked this out
Hours = nominal Wh × 0.8 / 300W is the formula, with 2048Wh and 3840Wh going in. The 80% factor is a shared planning allowance for unusable energy and conversion losses. It is not a measured efficiency. Idle draw, temperature and the real load will change the runtime.
The return on every pound you carry
BLUETTI Elite 400 holds 44.7 nominal watt-hours per pound, against about 41 for EcoFlow DELTA 2 Max.
How we worked this out
These are nominal energy over published weight, 2048 / 50 and 3840 / 86. The comparison covers stored energy per lifted weight and is not a measure of efficiency or handle comfort.
More stored energy, same solar ceiling
Both accept at most 1000W of combined solar input, yet Elite 400 stores 87.5% more energy than DELTA 2 Max.
How we worked this out
3840 / 2048 - 1 = 0.875. Refilling a larger discharged reserve takes proportionally more energy when harvested input is equal.
Option A
EcoFlow, EFD350
DELTA 2 Max
This expandable 2,048Wh station has 2,400W output and two independent 500W solar inputs. It works best with equipment that can stay near where it’s parked.
- Best for
- Backup for essentials that can grow, fed by two solar strings
Facts we checked
- 2,400W rated AC output from a 2,048Wh LFP battery
- Six AC outlets and two 100W USB-C ports, at about 50 lb
- Supported battery expansion, and two 500W solar inputs each at 11–60V and up to 15A
Option B
BLUETTI, Elite 400
Elite 400
On wheels and aimed at long outages with moderate loads, this battery stores far more energy than a 2kWh station. Its 2600W inverter can’t run every large appliance at once, though.
- Best for
- Running several essentials you’ve measured for longer, all from one self-contained battery.
Facts we checked
- 2600W rated AC output from a 3840Wh battery.
- A pull handle and built-in wheels.
- Solar input of 1000W, from 12V to 60V and 20A maximum.
- 15ms transfer.
- Charging from US AC alone is listed at about 2.5 hours to full.
Spec by spec
Where they really differ
| Spec | EcoFlow DELTA 2 Max | BLUETTI Elite 400 | In practice |
|---|---|---|---|
| Nominal battery energy | 2048 Wh | 3840 Wh | The starting runtime budget comes from stored energy. |
| Continuous AC output | 2400 W | 2600 W | Load screening uses this sustained rating, which is separate from surge and boost modes. |
| Lifting weight | 50 lb | 86 lb | Flat ground is where wheels help. A trunk, step or shelf still takes a lift. |
| Maximum solar input | 1000 W | 1000 W | Panel voltage, current and per-port limits have to fit as well. |
| Dedicated battery expansion | Supported with compatible equipment | Fixed base capacity | Integrated battery expansion is not the same as charging from an external source. |
| Published transfer limit | 30 ms | 15 ms | Check the exact device being connected. Even a short transfer specification can’t guarantee that every load runs without interruption. |
Trade-offs
What each pick costs you
With EcoFlow DELTA 2 Max
- Its older transfer specification is slower than that of the DELTA 3 Plus. If you plan a future upgrade, confirm that expansion batteries are still available before you buy.
With BLUETTI Elite 400
- Plan around 2600W of combined AC output. The 3900W lifting-mode number is a headline figure. Do not treat it as a working limit.
Decision guide
How to decide
Pick the Elite 400 for a larger self-contained reserve with wheels. Pick the DELTA 2 Max if easier lifting and growth with compatible batteries matter.
Solar capacity stays put as battery size grows
Each lists 1,000W maximum solar input, yet the Elite 400 stores 3,840Wh versus 2,048Wh. The larger battery takes more collected energy to refill.
A stationary job suits the larger reserve
Assuming a 300W load and 80% usable energy, the extra capacity adds about 4.8 hours. Beside a fixed appliance, that can count for more than carry weight.
Wheels only help if the floor plan allows
The Elite 400 weighs 86 pounds, versus 50. A path with steps still means lifting, so check the real route from storage to use.
What this page can’t tell you
- These runtime figures are planning estimates from published capacity. None come from hands-on discharge tests.
- Don’t connect a station to home wiring without approved transfer equipment and qualified installation. A battery station is no medical continuity guarantee.
By the numbers
What the data shows
What we found across the portable power stations we compare, plus the checked facts behind each finding.
How many fit
Only 6 of the 50 models checked meet every need here: “I need power at campsites and on weekends away”, “I want backup power for the essentials at home”, and “Solar will be a real part of how I recharge”.
6 models fit, out of 50 checkedThe gap in numbers
BLUETTI Elite 400 lists 3,840 Wh for battery capacity, 88% more than the 2,048 Wh on EcoFlow DELTA 2 Max.
- EcoFlow DELTA 2 Max
- 2,048 Wh
- BLUETTI Elite 400
- 3,840 Wh
- Models with this figure
- 50 of 50
Show the facts and the math
How we countedThe count uses each product's current fit ratings for “I need power at campsites and on weekends away”, “I want backup power for the essentials at home”, and “Solar will be a real part of how I recharge”. A need with no documented match is not counted.
How we calculatedThese are nominal watt-hour ratings. How much energy you get out depends on inverter losses, temperature and load. For context, 50 of 50 models publish comparable figures.
| Product | Needs it meets | Facts we checked | Sources |
|---|---|---|---|
| EcoFlow DELTA 2 Max |
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| BLUETTI Elite 400 |
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Ready to buy
See today’s price and what owners say
Open either model on Amazon for the current price, customer reviews and delivery options.
EcoFlow DELTA 2 Max
Lift the base unit with no need for a cart
See price & reviews on AmazonBLUETTI Elite 400
Hold more reserve inside a single enclosure
See price & reviews on AmazonEach link opens in a new tab.
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