Oupes Mega 5 Review: Value for Money Analysis

The short answer: the OUPES Mega 5 is a 5,040Wh, 4,000W whole-home-class power station that lists at $3,499 on OUPES's own site. That is about $0.69 per rated watt-hour, which is essentially level with the EcoFlow DELTA Pro 3 ($2,799 for 4,096Wh, about $0.68). So the "undercuts the big brands" idea only holds if you catch a discount. We found no independent lab test of it. At the time of checking (October 3, 2026) OUPES's page showed it as sold out.

Spec Sheet

Specs are cross-checked against OUPES's official Mega 5 product page (October 3, 2026). We did not test this unit and found no independent lab measurement of it.

At the 1,800W maximum input, a full charge would take roughly 3 hours (our arithmetic from the spec, not a tested figure).

How It Compares

The DELTA Pro 3 has a lab-measured result, a 50-minute 0-80% recharge claim, and a 4,000-cycle rating, with a 5-year warranty that includes 2 years tied to app registration. The Mega 5 gives you more capacity and a longer expansion ceiling. For most households, two or three smaller 2,000Wh units are cheaper per Wh. See our best power stations under $1,000.

Strengths

• Large base capacity: 5,040Wh can run a fridge for days.
• 4,000W continuous output with 7,000W surge for well pumps and large tools.
• LiFePO4 cells rated 3,500+ cycles at 80% depth of discharge.
• 2,100W solar input, high for any portable unit.
• Very large expansion ceiling of 45.36kWh.
• 5-year warranty plus 1 year on registration.

Tradeoffs

• 112.4 lb is not portable in any practical sense.
• No independent test data we could find, and a shorter brand track record than Jackery, EcoFlow, Bluetti, or Anker.
• Price is not a bargain at list, about level with the DELTA Pro 3 per Wh.
• Availability: it was sold out on OUPES's site when we checked.
• Support and returns are less proven than the big four; read the warranty terms before buying.

What This Actually Runs

We found no measured usable capacity, so these assume about 85% of rated (roughly 4,280Wh), consistent with the 75-93% range OutdoorGearLab measured across 14 stations:

• Full-size refrigerator (150W average): about 28 hours
• Mini fridge (80W): about 53 hours
• Space heater (1,500W): about 2.9 hours
• CPAP, 40W without humidifier, 8-hour nights: about 13 nights (about 6.7 with a heated humidifier)

Use our wattage sizing guide and CPAP guide for your own devices.

Who Should Buy This

Owners who need whole-home-class capacity in one box, have space to leave it in place, and can buy it on a discount. If you want better-documented performance, compare the EcoFlow Delta Pro 3, a Jackery Explorer 2000 Plus with expansion, or the EcoFlow Delta 2 Max. For more budget picks see our budget power station roundup.

Disclosure: WattStation HQ may earn a commission if you purchase through links on this page, at no extra cost to you. This does not affect our rankings — see our editorial policy.

Frequently Asked Questions

Is the Oupes Mega 5 cheaper than the EcoFlow DELTA Pro 3?

Not per watt-hour at list price. The Mega 5 is $3,499 for 5,040Wh (about $0.69 per Wh) and the DELTA Pro 3 is $2,799 for 4,096Wh (about $0.68), per each brand's site on October 3, 2026. The Mega 5 gives more total capacity; the DELTA Pro 3 costs less up front.

What warranty does the Oupes Mega 5 come with?

OUPES lists 5 years, plus 1 extra year when you register. Confirm the current terms and how to claim on OUPES's page before buying.

Can the Mega 5 run a whole house?

Not by itself. 4,000W continuous covers many circuits at once, but a home with central AC, an electric dryer, or an electric range can exceed it. Expansion adds energy, not output. Plan around the loads you need running at the same time.