The catch
OUPES Mega 1
You only get the 36-minute full-charge claim when AC and solar are used together.
Side by side
OUPES Mega 1 vs EcoFlow DELTA 3: DELTA shortens rated transfer time, and Mega raises the appliance ceiling
Quick verdict
A higher appliance ceiling and solar intake point to the Mega 1. If you need a shorter transfer time, the DELTA 3 fits, with almost identical carry weight.
Before you buy
Why, and what it costs you
Using a common load makes reserves easier to compare
At a steady 300W load, the model gives OUPES Mega 1 about 2.7 hours and EcoFlow DELTA 3 2.7 hours.
Where this comes from
Inputs of 1024Wh and 1024Wh feed hours = nominal Wh × 0.8 / 300W. The 80% factor is a planning allowance for unusable energy and conversion losses, shared by both, and not a measured efficiency. Idle draw, temperature and the real load change runtime.
The catch
EcoFlow DELTA 3
A single 500W solar input can’t take advantage of the 1000W two-input setup on the Plus model.
OUPES Mega 1
- Why pick it
- A supported load tops 1800W
- You expect to use more than 500W of solar
- The catch
- You only get the 36-minute full-charge claim when AC and solar are used together.
EcoFlow DELTA 3
- Why pick it
- A 10ms transfer specification is required
- EcoFlow expansion is your preference
- The catch
- A single 500W solar input can’t take advantage of the 1000W two-input setup on the Plus model.
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What this page compares
For a higher appliance ceiling and solar intake, the Mega 1 is the pick. The DELTA 3 suits a shorter transfer-time requirement, and the carry weight is almost identical.
Capacity can’t decide between these
Which one fits
Pick the situations that sound like you
A supported load tops 1800W
Only the Mega rating fits a 1,900W running load, since Mega 1 is rated for 2,000W continuous output and DELTA 3 for 1,800W. Startup demand and outlet requirements still need checking.
- OUPES Mega 1
- Better fit
- EcoFlow DELTA 3
- Not suitable
A 10ms transfer specification is required
Against Mega 1’s 20ms, DELTA 3 publishes a 10ms transfer limit. That satisfies the stated specification preference, though neither figure guarantees continuity for every connected device.
- OUPES Mega 1
- Not suitable
- EcoFlow DELTA 3
- Better fit
The battery has to carry a steady 300W load
The shared planning case puts OUPES Mega 1 at 2.7 hours and EcoFlow DELTA 3 at 2.7. Measure real wattage before settling on a required overnight reserve.
- OUPES Mega 1
- Depends
- EcoFlow DELTA 3
- Depends
I want solar to refill the battery
Maximum input runs to 800W on OUPES Mega 1 and 500W on EcoFlow DELTA 3. Hold your actual panel strings up to the voltage and current limits as well as this total.
- OUPES Mega 1
- Depends
- EcoFlow DELTA 3
- Depends
In practice
Differences you will notice
Using a common load makes reserves easier to compare
At a steady 300W load, the model gives OUPES Mega 1 about 2.7 hours and EcoFlow DELTA 3 2.7 hours.
How we worked this out
Inputs of 1024Wh and 1024Wh feed hours = nominal Wh × 0.8 / 300W. The 80% factor is a planning allowance for unusable energy and conversion losses, shared by both, and not a measured efficiency. Idle draw, temperature and the real load change runtime.
The return on every pound you carry
EcoFlow DELTA 3 stores 37.1 nominal watt-hours per pound, and OUPES Mega 1 stores about 36.8.
How we worked this out
Nominal energy over published weight comes to 1024 / 27.8 and 1024 / 27.6. This puts stored energy per lifting weight side by side, and it is not a measure of efficiency or handle comfort.
A nearly equal size class, but different priorities
DELTA 3 halves the published transfer-time figure, while Mega 1 provides 60% more maximum solar intake than DELTA 3.
How we worked this out
(800 / 500 - 1) × 100 = 60%. The transfer limits of 20ms and 10ms are not zero-interruption guarantees.
Option A
OUPES, Mega 1
Mega 1
A starter battery that’s easy to handle and can grow. The 2000W inverter can cover a short high-draw job. Two optional B2 batteries solve a different problem, keeping smaller loads running longer.
- Best for
- A small backup system that could need far more runtime down the line.
Facts we checked
- 2000W continuous AC output, with 1024Wh capacity.
- About 27.8 lb.
- With two B2 batteries, total capacity rises to 5120Wh.
- 1400W AC input and 800W solar input.
- Four AC outlets and two 100W USB-C ports.
- The manufacturer lists transfer within 20ms.
Option B
EcoFlow, DELTA 3
DELTA 3
This expandable DELTA 3 is for buyers who can do without the extra solar input of the Plus model. Battery and inverter are the same size, so the simpler charging setup may be all you need.
- Best for
- Camping loads and home essentials paired with a moderate solar array.
Facts we checked
- 1800W rated AC output from a 1024Wh battery.
- About 27.6 lb.
- A single 500W solar input, with a range of 11V to 60V.
- Six AC outlets and two 100W USB-C ports.
- Support for compatible DELTA-series expansion batteries.
- 1500W AC charging and under-10ms transfer.
Spec by spec
Where they really differ
| Spec | OUPES Mega 1 | EcoFlow DELTA 3 | In practice |
|---|---|---|---|
| Nominal battery energy | 1024 Wh | 1024 Wh | The starting runtime budget comes from stored energy. |
| Continuous AC output | 2000 W | 1800 W | Load screening uses this sustained rating, which is separate from surge and boost modes. |
| Lifting weight | 27.8 lb | 27.6 lb | Flat ground is where wheels help. A trunk, step or shelf still takes a lift. |
| Maximum solar input | 800 W | 500 W | Panel voltage, current and per-port limits have to fit as well. |
| Dedicated battery expansion | Supported with compatible equipment | Supported with compatible equipment | Integrated battery expansion is not the same as charging from an external source. |
| Published transfer limit | 20 ms | 10 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 OUPES Mega 1
- A 2000W appliance won’t run for hours on 1024Wh.
With EcoFlow DELTA 3
- Each USB-C port tops out at 100W instead of 140W.
Decision guide
How to decide
Pick the Mega 1 for a higher appliance ceiling and solar intake. The DELTA 3 is for a shorter transfer-time requirement at almost identical carry weight.
Capacity can’t decide between these
Each has 1,024Wh, and their weights are within 0.2 pounds of each other. Base runtime and carrying burden land in effectively the same planning class.
The output gap helps only with the right load
The Mega 1 raises the continuous ceiling by 200W. That helps a compatible load near 1,800W, but it gives electronics no extra battery energy.
Transfer time and solar pull opposite ways
The DELTA 3 specifies 10ms transfer, against 20ms for the Mega 1. The Mega lists 800W of solar input, against 500W. Go with the requirement you have.
What this page can’t tell you
- Runtime numbers here are estimates for planning, derived from published capacity rather than hands-on discharge testing.
- Connecting a station to home wiring requires approved transfer equipment and qualified installation. A battery station is not guaranteed to provide medical continuity.
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
OUPES Mega 1 lists 2,000 W for continuous AC output rating, 11% more than the 1,800 W on EcoFlow DELTA 3.
- OUPES Mega 1
- 2,000 W
- EcoFlow DELTA 3
- 1,800 W
- Models with this figure
- 47 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 calculatedFigures are the continuous output rating. Surge numbers and boost modes that lower voltage do not count. For context, 47 of 50 models publish comparable figures.
| Product | Needs it meets | Facts we checked | Sources |
|---|---|---|---|
| OUPES Mega 1 |
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| EcoFlow DELTA 3 |
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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.
OUPES Mega 1
A supported load tops 1800W
See price & reviews on AmazonEcoFlow DELTA 3
A 10ms transfer specification is required
See price & reviews on AmazonEach link opens in a new tab.
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