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 RIVER 2 Pro: RIVER fits a lighter sub-800W kit, and Mega adds output and expansion
Quick verdict
Mega 1 is the one for higher-power appliances and a reserve you can expand. A lighter travel kit with loads under 800W belongs with the RIVER 2 Pro.
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 RIVER 2 Pro 2 hours.
Where this comes from
Hours = nominal Wh × 0.8 / 300W, with 1024Wh and 768Wh as the inputs. The 80% factor is a planning allowance both units share for unusable energy and conversion losses. It is not a measured efficiency. Runtime also changes with idle draw, temperature and the real load.
The catch
EcoFlow RIVER 2 Pro
Even though it holds 50% more battery energy, the 220W solar input is the same ceiling as on the RIVER 2 Max.
OUPES Mega 1
- Why pick it
- Require continuous output beyond 800W
- Assemble a bigger kit that runs on solar
- The catch
- You only get the 36-minute full-charge claim when AC and solar are used together.
EcoFlow RIVER 2 Pro
- Why pick it
- Stay below twenty pounds when carrying it
- Power just small electronics and appliances
- The catch
- Even though it holds 50% more battery energy, the 220W solar input is the same ceiling as on the RIVER 2 Max.
We may earn a commission from qualifying Amazon purchases. How we make money
What this page compares
Mega 1 is the pick when you run higher-power appliances or want a reserve you can expand. RIVER 2 Pro fits a lighter travel kit where loads stay below 800W.
What the larger unit really adds is appliance headroom
Which one fits
Pick the situations that sound like you
Require continuous output beyond 800W
Mega 1 takes output from 800W to 2,000W but adds one third more energy. Pick it when the load needs that inverter. Runtime does not grow in step.
- OUPES Mega 1
- Better fit
- EcoFlow RIVER 2 Pro
- Not suitable
Stay below twenty pounds when carrying it
RIVER 2 Pro, at 18.2 lb, meets the under-20-lb constraint, and Mega 1 at 27.8 lb is 7.8 lb over it.
- OUPES Mega 1
- Not suitable
- EcoFlow RIVER 2 Pro
- Better fit
The battery has to carry a steady 300W load
With the common planning assumptions, OUPES Mega 1 reaches 2.7 hours and EcoFlow RIVER 2 Pro reaches 2. Measure the real wattage before you set the overnight reserve you require.
- OUPES Mega 1
- Depends
- EcoFlow RIVER 2 Pro
- Depends
I want solar to refill the battery
OUPES Mega 1 takes up to 800W of input and EcoFlow RIVER 2 Pro up to 220W. Your panel strings also need to fit the voltage and current limits, in addition to this total.
- OUPES Mega 1
- Depends
- EcoFlow RIVER 2 Pro
- 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 RIVER 2 Pro 2 hours.
How we worked this out
Hours = nominal Wh × 0.8 / 300W, with 1024Wh and 768Wh as the inputs. The 80% factor is a planning allowance both units share for unusable energy and conversion losses. It is not a measured efficiency. Runtime also changes with idle draw, temperature and the real load.
The return on every pound you carry
EcoFlow RIVER 2 Pro stores 42.2 nominal watt-hours per pound, and OUPES Mega 1 stores about 36.8.
How we worked this out
This is nominal energy over published weight, 1024 / 27.8 and 768 / 18.2. It compares stored energy per lifted weight. It does not measure efficiency or handle comfort.
The inverter jump far outpaces the energy jump
Mega 1's continuous output is 2.5 times that of RIVER 2 Pro, yet its nominal battery capacity is only one third higher.
How we worked this out
1024 / 768 - 1 = 0.3333. 2000 / 800 = 2.5.
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, EFR620
RIVER 2 Pro
This 768Wh camping station has 800W continuous AC output and a handy 100W USB-C port. You get extra battery reserve without the weight of a full 1kWh unit.
- Best for
- Longer stays powering lights, laptops and a car fridge
Facts we checked
- 800W rated AC output from a 768Wh LFP battery
- 100W USB-C and regulated 12.6V DC output, at about 18.2 lb
- An advertised 70-minute AC recharge, plus 220W solar input at 11–50V and up to 13A
Spec by spec
Where they really differ
| Spec | OUPES Mega 1 | EcoFlow RIVER 2 Pro | In practice |
|---|---|---|---|
| Nominal battery energy | 1024 Wh | 768 Wh | The starting runtime budget comes from stored energy. |
| Continuous AC output | 2000 W | 800 W | Load screening uses this sustained rating, which is separate from surge and boost modes. |
| Lifting weight | 27.8 lb | 18.2 lb | Flat ground is where wheels help. A trunk, step or shelf still takes a lift. |
| Maximum solar input | 800 W | 220 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 | 20 ms | 30 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 RIVER 2 Pro
- This page covers the 768Wh Pro. The 716Wh Pro 700 is a different model. Keep combined steady loads under 800W, and check motor startup on its own.
Decision guide
How to decide
If your appliances draw more power or you want expandable reserve capacity, Mega 1 is the one. A lighter travel kit with loads below 800W is where the RIVER 2 Pro fits.
What the larger unit really adds is appliance headroom
Mega 1 takes output from 800W to 2,000W but adds one third more energy. Pick it when the load needs that inverter. Runtime does not grow in step.
More solar input only pays off with a suitable array
Solar input is listed at 800W for Mega 1 versus 220W. Before wiring up a bigger array, check the panels' open-circuit voltage, operating voltage and current.
On a simple trip, the smaller station can be better
The RIVER 2 Pro weighs 9.6 pounds less. For just a laptop, lights and a small fan, that saving can matter more than a high-power inverter you never use.
What this page can’t tell you
- The runtimes quoted are estimates built from published capacity, and no hands-on discharge tests back them up.
- Never tie a station into household wiring unless you have approved transfer equipment and a qualified installer. A battery station also gives no guarantee of 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, 150% more than the 800 W on EcoFlow RIVER 2 Pro.
- OUPES Mega 1
- 2,000 W
- EcoFlow RIVER 2 Pro
- 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 |
|
|
|
| EcoFlow RIVER 2 Pro |
|
|
|
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
Require continuous output beyond 800W
See price & reviews on AmazonEcoFlow RIVER 2 Pro
Stay below twenty pounds when carrying it
See price & reviews on AmazonEach link opens in a new tab.
We may earn a commission from qualifying Amazon purchases. How we make money