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EcoFlow RIVER 3 Max Plus Runtime Calculator

Quick answer: the EcoFlow RIVER 3 Max Plus stores 858 Wh and delivers up to 600 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 6.6 hours. Last source check: 2026-08-21. This is an estimate, not a guarantee.

EcoFlow RIVER 3 Max Plus portable power station
Battery capacity858 Wh
AC output600 W
Surge output1,200 W
Battery chemistryLiFePO4
ConfidenceVerified
Source regionUS source
checked2026-08-21
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EcoFlow RIVER 3 Max Plus: Key facts
Battery capacity858 Wh
Battery chemistryLiFePO4
AC output600 W
Surge output1,200 W
DC output126 W
USB-C output140 W
Solar input220 W
Weight10.5 kg
ConfidenceVerified
Lifecycle statusUnknown
Source regionUS source
Last verified2026-08-21
Catalog notes (original English)

Record models the RIVER 3 Plus paired with the EB600. The 10.5kg transport weight is the explicit 4.7kg base-station plus 5.8kg EB600 component sum; USB-C stores the highest single port in the system, the EB600's 140W port.

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.

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Runtime estimate
Device scenarioPlanning defaultEstimated runtimeDevice scenario: ConfidenceModels
Full-size refrigerator500 W · 33% · AC inverter · Reserve: 10%3h 59m
Exceeds a tracked power limit — do not rely on these hours		EstimatedCalculator
CPAP without heated humidifier40 W · 100% · AC inverter · Reserve: 15%15h 30m
Within the tracked power limits; compatibility still needs checking		EstimatedCalculator
Starlink Mini32 W · 100% · USB-C PD · Reserve: 10%22h 12m
Within the tracked power limits; compatibility still needs checking		EstimatedCalculator
Wi-Fi router12 W · 100% · AC inverter · Reserve: 10%2d 8h
Within the tracked power limits; compatibility still needs checking		EstimatedCalculator
LED TV100 W · 100% · AC inverter · Reserve: 10%6h 34m
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): 858 WhContinuous output rating (W): 600 WSurge output rating (W): 1200 W
EcoFlow RIVER 3 Max Plus
Estimated runtime10h 56m6h 51m – 13h 35mEstimated runtime: 10h 56m, 6h 51m – 13h 35m
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.

10h 56mEstimated runtime: 10h 56m

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

Conservative6h 51m
Estimated10h 56m
Optimistic13h 35m

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
858 Wh
Usable energy
656 Wh
858 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
10h 56m
656 Wh / 60 W = 10h 56m
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

10h 56mThis setup may cover a partial outage or single overnight session. Add capacity for more margin.
Usable energy656 Wh
Average load60 W
Fixed station overheadUnknown (not included)
Running watts60 W
Max surgen/a

Runtime range

Conservative6h 51m
Estimated10h 56m
Optimistic13h 35m

Show your work

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

Usable energy656 Wh858 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 runtime10h 56m656 Wh / 60 W = 10h 56m

Assumptions

  • 858 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: 858 Wh. Size the battery for your measured average load and required hours, including reserve.
  • Tracked output: 600 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: 10.5 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