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EcoFlow RIVER 2 Max Runtime Calculator

Quick answer: the EcoFlow RIVER 2 Max stores 512 Wh and delivers up to 500 W of continuous AC power. Under this site's planning assumptions (85% inverter efficiency, 10% reserve), a steady 100 W AC load runs for roughly 3.9 hours. Last source check: 2026-08-21. This is an estimate, not a guarantee.

EcoFlow RIVER 2 Max portable power station
Battery capacity512 Wh
AC output500 W
Surge output1,000 W
Battery chemistryLFP
ConfidenceEstimated
Source regionUS source
checked2026-08-21
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EcoFlow RIVER 2 Max: Key facts
Battery capacity512 Wh
Battery chemistryLFP
AC output500 W
Surge output1,000 W
DC output126 W
USB-C output100 W
Solar input220 W
Weight6.1 kg
ConfidenceEstimated
Lifecycle statusUnknown
Source regionUS source
Last verified2026-08-21
Catalog notes (original English)

The exact US specification table and manual support the stored 6.1kg weight, while marketing copy on the same current page says 13.2lb; the conflict remains visible through estimated confidence. The 1,000W value is retained because the specification labels it as surge separately from the 500W rated output.

Runtime estimate

Formula starting points use each scenario’s default watts, duty cycle and output path, with 10% reserve or 15% for CPAP. Linked detail pages use the same inputs. Hours apply only if the device can run and start; they are not measured runtimes.

Swipe table sideways
Runtime estimate
Device scenarioPlanning defaultEstimated runtimeDevice scenario: ConfidenceModels
Full-size refrigerator500 W · 33% · AC inverter · Reserve: 10%2h 22m
Exceeds a tracked power limit — do not rely on these hours		EstimatedCalculator
CPAP without heated humidifier40 W · 100% · AC inverter · Reserve: 15%9h 15m
Within the tracked power limits; compatibility still needs checking		EstimatedCalculator
Starlink Mini32 W · 100% · USB-C PD · Reserve: 10%13h 15m
Within the tracked power limits; compatibility still needs checking		EstimatedCalculator
Wi-Fi router12 W · 100% · AC inverter · Reserve: 10%1d 9h
Within the tracked power limits; compatibility still needs checking		EstimatedCalculator
LED TV100 W · 100% · AC inverter · Reserve: 10%3h 55m
Within the tracked power limits; compatibility still needs checking		EstimatedCalculator
Adjust these assumptions in the runtime calculator

Runtime calculator

Runtime is conditional on successful startup, compatible voltage/connectors and sufficient output. Verify the actual device setup before relying on these hours.

Loading calculatorPreparing calculator
Power station model
Battery capacity (Wh): 512 WhContinuous output rating (W): 500 WSurge output rating (W): 1000 W
EcoFlow RIVER 2 Max
Estimated runtime6h 32m4h 5m – 8h 6mEstimated runtime: 6h 32m, 4h 5m – 8h 6m
Output path

Estimated runtime

Within the tracked power limits; compatibility still needs checking

This is an estimate. Real runtime changes with load, temperature, battery age, AC/DC output, and device behavior. Runtime is conditional on successful startup, compatible voltage/connectors and sufficient output. Verify the actual device setup before relying on these hours.

6h 32mEstimated runtime: 6h 32m

This setup may cover a partial outage or single overnight session. Add capacity for more margin.

Conservative4h 5m
Estimated6h 32m
Optimistic8h 6m

These are calculated sensitivity cases, not a statistical confidence interval. Conservative uses lower efficiency and battery health, more reserve/temperature loss and higher load; optimistic changes these assumptions in the opposite direction.

  • This is an estimate. Real runtime changes with load, temperature, battery age, AC/DC output, and device behavior. Runtime is conditional on successful startup, compatible voltage/connectors and sufficient output. Verify the actual device setup before relying on these hours.
  • Within the tracked power limits; compatibility still needs checking

Show your work

Rated Wh is reduced by efficiency, reserve, battery health, and temperature before it is divided by average load.

Rated battery
512 Wh
Usable energy
392 Wh
512 Wh x 85% x 90% x 100% x 100%
Running watts
60 W
Average load
60 W
Max surge
n/a
Fixed station overhead
Unknown (not included)
60 W / 85% = 70.6 W battery draw; fixed overhead is unknown and excluded
Estimated runtime
6h 32m
392 Wh / 60 W = 6h 32m
Output path
AC inverter
Efficiency (%)
85
Reserve kept unused (%)
10
Battery health (%)
100
Cold weather loss (%)
0

This link contains the numeric values you entered, but not custom load names.

Source-Backed Next Steps

WattRunTime.com

WattRunTime estimate

Estimated runtime

6h 32mThis setup may cover a partial outage or single overnight session. Add capacity for more margin.
Usable energy392 Wh
Average load60 W
Fixed station overheadUnknown (not included)
Running watts60 W
Max surgen/a

Runtime range

Conservative4h 5m
Estimated6h 32m
Optimistic8h 6m

Show your work

Rated Wh is reduced by efficiency, reserve, battery health, and temperature before it is divided by average load.

Usable energy392 Wh512 Wh x 85% x 90% x 100% x 100%
Fixed station overheadUnknown (not included)60 W / 85% = 70.6 W battery draw; fixed overhead is unknown and excluded
Estimated runtime6h 32m392 Wh / 60 W = 6h 32m

Assumptions

  • 512 Wh nominal battery capacity
  • AC inverter output path
  • 85% conversion efficiency
  • 10% reserve kept unused
  • 60 W average load from 1 load
  • 100% battery health
  • 0% temperature loss
  • Fixed station overhead unknown; not included

Warnings

  • This is an estimate. Real runtime changes with load, temperature, battery age, AC/DC output, and device behavior. Runtime is conditional on successful startup, compatible voltage/connectors and sufficient output. Verify the actual device setup before relying on these hours.
  • Within the tracked power limits; compatibility still needs checking

Planning notes

  • Capacity class: 512 Wh. Size the battery for your measured average load and required hours, including reserve.
  • Tracked output: 500 W. Compare both running demand and startup demand before using any runtime estimate.
  • Solar input limit: 220 W. Actual refill depends on panel voltage/current compatibility, sunlight, angle and charging losses.

Known data gaps

  • Unverified or missing specifications remain visible. The confidence label describes the station record, not a tested runtime or approval for emergency use.
  • Weight: 6.1 kg. Check the complete carrying setup, cables and battery extensions before choosing this model for travel.
  • unknown: —

Models: EcoFlow

Compare nearby capacity records from the same brand, then check output, weight and missing fields. A larger battery does not establish device compatibility.

Sources