Mega 5 4000W Portable Power Station
All-in-One System Portable
5.04 kWh LFP, 4000 W AC (8000 W surge), 2400 W solar. Modular: stacks with up to four B5 batteries for 25 kWh total.
Normalized price
$536 per kWh
$2,699 listed price
Methodology: lowest in-stock merchant price · normalized to nameplate
DIY off-grid builds where price-per-kWh matters
The data
Specifications
Battery
| Capacity (nominal) | 5.04 kWh |
|---|---|
| Chemistry | LFP |
| Max expandable capacity | 25.2 kWh |
Output
| Continuous AC output | 4 kW |
|---|---|
| Surge output | 8 kW |
| Outlets | 4× 120V AC, 1× 240V AC, 2× USB-A, 2× USB-C, 1× 12V DC, 1× Anderson |
Charging
| Solar input | 2400 W |
|---|---|
| AC input | 2.4 kW |
Smart features & certifications
| App / Wi-Fi | Yes |
|---|---|
| App brand | Oupes |
Physical
| Weight | 56 kg |
|---|
Warranty
| Warranty | 5 years |
|---|
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Editorial
Best for, watch out for
Best for
- DIY off-grid builds where price-per-kWh matters
- RVs with sustained heavy loads
Watch out for
- Newer brand — track record on warranty service is shorter than Bluetti / EcoFlow
The market
Price history
Price history
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Common questions
What people ask about the Mega 5 4000W Portable Power Station
What's the difference between Mega 5 4000W Portable Power Station and a residential all-in-one inverter-battery?
Oupes Mega 5 4000W Portable Power Station is a solar generator (portable power station) — designed to be picked up and moved, with built-in outlets and a solar input port. It's distinct from a residential AIO like the EcoFlow PowerOcean or Sol-Ark 12K, which is a permanent-install hybrid inverter wired into a home's main panel. Solar generators excel at backup-of-last-resort, off-grid trips, and powering specific high-priority devices. Residential AIOs are what you'd choose to back up the whole home.
What can Oupes Mega 5 4000W Portable Power Station actually run, and for how long?
With 4000W continuous AC output, Oupes Mega 5 4000W Portable Power Station can run anything that draws under that wattage continuously: refrigerators (~150W), LED lights, laptops, modems, CPAP machines, even small space heaters at low setting. Surge to 8000W means it can handle motor-startup spikes from compressors and small pumps. At 5.04kWh capacity, runtime depends on draw: a 60W draw runs 71 hours, a 600W draw runs 7.1 hours. (The 0.85 factor is realistic round-trip efficiency.)
How do I expand capacity?
Oupes Mega 5 4000W Portable Power Station expands to 25.2kWh total via add-on battery packs from the same manufacturer. The expansion battery connects with a single high-current cable and the BMS treats the combined bank as one battery. Note that the inverter section's continuous AC output (4000W) doesn't increase with capacity — only runtime does.
Will this charge from the panels I already have?
Oupes Mega 5 4000W Portable Power Station accepts solar input via a built-in MPPT charger. The exact voltage range and max wattage on this unit aren't in our verified spec set — confirm before pairing with rooftop or portable panels, as solar generator MPPTs typically have tight voltage windows that not every panel string fits.
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