BLUETTI AC50B vs EcoFlow RIVER 2 Max

EcoFlow RIVER 2 Max portable power station

Pick this if

BLUETTI AC50B

Continuous AC output: 700 W vs 500 W

Buyers who measure value in watts and watt-hours, not in grams and app screens.

Pick this if

EcoFlow RIVER 2 Max

Capacity: 512 Wh vs 448 Wh
Weight: 13.4 lb vs 14.8 lb
List price: $249 vs $499
Cost per watt-hour: $0.49 vs $1.11

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

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	AC50B	RIVER 2 Max	What it means
Capacity	448 Wh	512 Wh	How much energy the unit stores. Sets how long everything else can run.
Continuous AC output	700 W	500 W	The largest load the inverter will run continuously, not counting surge.
Weight lower is better	14.8 lb	13.4 lb	The spec buyers most often regret ignoring.
List price lower is better	$499	$249	Vendor list price at the time of collection; street prices move.
Cost per watt-hour lower is better	$1.11	$0.49	Price divided by capacity. The fairest single value metric.
Watt-hours per pound	30.3 Wh/lb	38.2 Wh/lb	Capacity you get per pound carried.
Max solar input	—	220 W	Caps how large an array is useful, and therefore off-grid recharge speed.
AC recharge time lower is better	70 min	60 min	Vendor-stated time to full from a wall outlet.
Rated cycles	3,000 cycles	3,000 cycles	Vendor claim for charge cycles before capacity degrades to 80%.
UPS switchover lower is better	—	30 ms	How long the unit takes to switch to battery. Under 20 ms keeps a desktop alive.
Max expandable capacity	806 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

BLUETTI AC50B

#65 of 73 for Best value (Wh per dollar) ($1.11)
#63 of 74 for Most portable (Wh per pound) (30.3 Wh/lb)
#16 of 75 for Most inverter headroom (156 W/100Wh)
#24 of 36 for Fastest AC recharge (384 W)
#24 of 24 for Most expandable (806 Wh)
#49 of 65 for Longest service life (1344 kWh)
#52 of 72 for Most output per dollar (1.40 W/$)
#63 of 75 for Best for home backup (43/100)
#29 of 75 for Longest warranty (60 mo)

EcoFlow RIVER 2 Max

#22 of 73 for Best value (Wh per dollar) ($0.49)
#34 of 74 for Most portable (Wh per pound) (38.2 Wh/lb)
#61 of 75 for Most inverter headroom (98 W/100Wh)
#19 of 36 for Fastest AC recharge (512 W)
#41 of 55 for Highest solar input (220 W)
#47 of 65 for Longest service life (1536 kWh)
#38 of 72 for Most output per dollar (2.01 W/$)
#59 of 75 for Best for home backup (48/100)
#12 of 75 for Longest warranty (60 mo)
#26 of 27 for Quietest under load (62 dB)

The brands behind them

BLUETTI

The value-and-power buyer who does not mind a heavy box

Best for: Buyers who measure value in watts and watt-hours, not in grams and app screens.

Not for: Buyers who need the lightest possible unit or the simplest possible interface.

Full BLUETTI profile →

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 →

Where these numbers come from. Every figure on this page is taken from BLUETTI’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: www.bluettipower.com/products/solar-generator-ac50b.

Vendor wording for each figure (7)

capacityWh: “448Wh capacity for extended battery life”
acOutputW: “700W continuous power”
weight: “6.7 kg/14.8 lbs”
rechargeAcMinutes: “fully charge in 70 minutes”
cycleLife: “3,000+ Cycles to 80% Original Capacity”
maxExpandableWh: “an additional 806Wh of power”
warrantyMonths: “industry-leading 5-year warranty”

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/river-2-max-portable-power-station.

Vendor wording for each figure (8)