EcoFlow DELTA 3 Ultra vs oupes Mega 3

EcoFlow DELTA 3 Ultra portable power station

Pick this if

EcoFlow DELTA 3 Ultra

Weight: 72.1 lb vs 83.3 lb
Watt-hours per pound: 42.6 Wh/lb vs 36.9 Wh/lb
Max solar input: 3,200 W vs 2,100 W

Buyers who want one system to grow from camping into home backup.

Pick this if

oupes Mega 3

List price: $1,199 vs $1,399
Cost per watt-hour: $0.39 vs $0.46

Buyers who need maximum capacity for the least money and accept the trade-offs.

Spec by spec

A green arrow marks the better figure on each row. Rows where only one unit publishes a number are shown without a winner rather than guessed.

Metric	DELTA 3 Ultra	Mega 3	What it means
Capacity	3,072 Wh	3,072 Wh	How much energy the unit stores. Sets how long everything else can run.
Continuous AC output	3,600 W	3,600 W	The largest load the inverter will run continuously, not counting surge.
Weight lower is better	72.1 lb	83.3 lb	The spec buyers most often regret ignoring.
List price lower is better	$1,399	$1,199	Vendor list price at the time of collection; street prices move.
Cost per watt-hour lower is better	$0.46	$0.39	Price divided by capacity. The fairest single value metric.
Watt-hours per pound	42.6 Wh/lb	36.9 Wh/lb	Capacity you get per pound carried.
Max solar input	3,200 W	2,100 W	Caps how large an array is useful, and therefore off-grid recharge speed.
Rated cycles	—	3,500 cycles	Vendor claim for charge cycles before capacity degrades to 80%.
UPS switchover lower is better	—	20 ms	How long the unit takes to switch to battery. Under 20 ms keeps a desktop alive.
Max expandable capacity	—	15,360 Wh	How far the system can grow with add-on batteries.
Warranty	60 months	60 months	Stated warranty length from the vendor listing.

How each one ranks overall

EcoFlow DELTA 3 Ultra

#32 of 104 for Best value (cost per watt-hour) ($0.46)
#21 of 103 for Most portable (Wh per pound) (42.6 Wh/lb)
#60 of 106 for Most inverter headroom (117 W/100Wh)
#4 of 83 for Highest solar input (3.2 kW)
#44 of 103 for Most output per dollar (2.57 W/$)
#33 of 106 for Best for home backup (67/100)
#21 of 105 for Longest warranty (60 mo)
#5 of 29 for Quietest under load (25 dB)

oupes Mega 3

#17 of 104 for Best value (cost per watt-hour) ($0.39)
#53 of 103 for Most portable (Wh per pound) (36.9 Wh/lb)
#69 of 106 for Most inverter headroom (117 W/100Wh)
#14 of 83 for Highest solar input (2.1 kW)
#9 of 36 for Most expandable (15.36 kWh)
#16 of 96 for Longest service life (10752 kWh)
#29 of 103 for Most output per dollar (3.00 W/$)
#4 of 106 for Best for home backup (84/100)
#59 of 105 for Longest warranty (60 mo)

The brands behind them

EcoFlow

The tech-forward buyer who reads the spec sheet and wants room to grow

Best for: Buyers who want one system to grow from camping into home backup.

Not for: Buyers who want the lowest cost per watt-hour and will never use an app.

Full EcoFlow profile →

OUPES

The price-first buyer comparing watt-hours on a marketplace listing

Best for: Buyers who need maximum capacity for the least money and accept the trade-offs.

Not for: Buyers who value support, app quality or long-term resale.

Full OUPES profile →

Where these numbers come from. Every figure on this page is taken from EcoFlow’s own product listing and is stored with the vendor’s exact wording, reproduced below. We do not estimate missing specs — a field the vendor does not publish is shown as “—” and excluded from rankings. Source: us.ecoflow.com/products/ecoflow-delta-3-ultra-portable-power-station-3072wh.

Vendor wording for each figure (5)

capacityWh: “Rated Capacity => 3072Wh 51.2V 60Ah”
acOutputW: “3600W total (surge 7200W)”
weight: “Net Weight => 32.7±0.6kg”
solarInputW: “3200W Max”
warrantyMonths: “5-Year Warranty”

Where these numbers come from. Every figure on this page is taken from oupes’s own product listing and is stored with the vendor’s exact wording, reproduced below. We do not estimate missing specs — a field the vendor does not publish is shown as “—” and excluded from rankings. Source: oupes.com/products/oupes-mega-3-home-backup-portable-power-station-3600w-3072wh.

Vendor wording for each figure (8)