EcoFlow

EcoFlow RIVER 2 Max

Name: EcoFlow RIVER 2 Max
Brand: EcoFlow

EcoFlow RIVER 2 Max stores 512 Wh and can hold a continuous 500 W load, plus X-Boost to 1,000 W for simple heaters.

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Specifications

Capacity	512 Wh
Usable in Willrun math	435 Wh (× 0.85)
Continuous AC output	500 W
Motor surge used	Not used
Resistive boost	X-Boost 1,000 W
Chemistry	LiFePO4
Cycle life	3,000 cycles to 80%+
Weight	13.4 lb
Dimensions	10.6 × 10.2 × 7.7
Outlets	4 AC outlets, 500 W shared, plus USB-A, USB-C (100 W), and 12.6 V DC ports on the product spec list.
Launch price	Not verified. Current shelf prices were not copied in.
Source	https://us.ecoflow.com/products/river-2-max-portable-power-station Product spec: 512 Wh and 500 W (surge 1,000 W). The same 1,000 W is the X-Boost rating on EcoFlow's comparison table, which also lists 13.4 lb and 4 AC outlets. Willrun does not treat that 1,000 W as motor-start capacity.

Every appliance in the set

Appliance	Verdict	Runtime
Danby DCR032C1WDB 3.2 cu ft compact refrigerator	Runs, surge risk	17.5 hr
Danby DAR032B1SLM 3.2 cu ft compact refrigerator	Runs, surge risk	14.7 hr
Danby DAR026A1BDD 2.6 cu ft compact refrigerator	Runs, surge risk	15.1 hr
Danby DAR010A1BDB 1.0 cu ft compact refrigerator	Runs, surge risk	15.8 hr
Samsung RT18DG6300 17.5 cu ft top-freezer refrigerator	No run verdict	11.5 hr
Whirlpool WZC3209LW 9 cu ft chest freezer	No run verdict	19.0 hr
Danby DCF100A5WDB 10 cu ft chest freezer	No run verdict	18.1 hr
Frigidaire FFFH20F3W 20 cu ft upright freezer	No run verdict	8.0 hr
BLACK+DECKER BDM05C 5,000 Btu/h window air conditioner	Runs, surge risk	1.3 hr
BLACK+DECKER BD08NWES 8,000 Btu/h window air conditioner	Won't run	—
BLACK+DECKER BD12NWES 12,000 Btu/h window air conditioner	Won't run	—
GE PWJV10 10,000 Btu/h window air conditioner	Won't run	—
Zoeller Model 53 3/10 HP sump pump, 115 V	Won't run	—
ResMed AirSense 11, typical power from the user guide	Runs	7.8 hr
ResMed AirSense 11 AutoSet, no humidifier	Runs	2.6 days
ResMed AirSense 11 with HumidAir 11 and ClimateLineAir 11	Runs	7.9 hr
ResMed AirMini travel CPAP	Runs	2.9 days
LG 55QNED85 55-inch TV	Runs	5.7 hr
Sansui LE-32T1 32-inch TV	Runs	15.3 hr
Sansui LE-55V4 55-inch TV	Runs	6.0 hr
Samsung QN65QN90D 65-inch TV	Runs	3.6 hr
LG 27BA450 27-inch monitor	Runs	36.9 hr
Amana AMND501BW dehumidifier, about 50 pints/day	Runs, surge risk	54 min
Frigidaire FHDD2233Y1 dehumidifier, about 22 pints/day	Runs, surge risk	1.7 hr
Hunter 52774 44-inch ceiling fan, high speed	Runs	34.8 hr
Hunter 52881 44-inch ceiling fan, high speed	Runs	24.7 hr
Broan 688ESL bathroom fan	Runs	26.1 hr
Broan 744 bathroom fan	Runs	24.9 hr
Simply Conserve L9W-A19 LED bulb	Runs	2.0 days
Luminus PLYS120TW LED bulb	Runs	2.0 days
13-inch MacBook Air, included adapter maximum	Runs	7.3 hr
Lenovo IdeaPad Vibe 15AKP12, ENERGY STAR short idle	Runs	3.0 days
Lenovo IdeaPad Vibe 14AKP12, ENERGY STAR short idle	Runs	4.8 days
Apple Mac Studio (M5 Ultra), ENERGY STAR short idle	Runs	2.6 days
Lasko 755320 ceramic heater, high	Won't run	—
Lasko 755320 ceramic heater, low	Runs	29 min
Panasonic NN-SU656WAWH microwave, electrical input	Won't run	—
TP-Link Archer AX73 router, networked standby	Runs	2.1 days
LG LCE3010 induction cooktop, 1,200 W zone	Won't run	—
LG LCE3010 induction cooktop, 1,900 W zone	Won't run	—

Questions

How long will the EcoFlow RIVER 2 Max run a CPAP?

Runs. At the AirSense 11 user-guide typical of 56.1 W, usable energy is 435 Wh and runtime is about 7.8 hr.

What does the 0.85 factor do?

Willrun multiplies nameplate watt-hours by 0.85 before dividing by average draw. That allowance is for inverter loss. It is not a measured efficiency for this model.

Is the surge rating safe to use for a fridge or a pump?

The extra headroom on this model is X-Boost. Willrun does not treat it as locked-rotor starting capacity.

Where do the station numbers come from?

Product spec: 512 Wh and 500 W (surge 1,000 W). The same 1,000 W is the X-Boost rating on EcoFlow's comparison table, which also lists 13.4 lb and 4 AC outlets. Willrun does not treat that 1,000 W as motor-start capacity.