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Goal Zero Yeti 400 Lithium Runtime Calculator

Quick answer: the Goal Zero Yeti 400 Lithium stores 428 Wh and delivers up to 300 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 3.3 hours. Last source check: 2026-08-27. This is an estimate, not a guarantee.

Goal Zero Yeti 400 Lithium portable power station
Battery capacity428 Wh
AC output300 W
Surge output1,200 W
Battery chemistryLi-ion NMC
ConfidenceEstimated
Source regionGlobal/general sources
checked2026-08-27
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Goal Zero Yeti 400 Lithium: Key facts
Battery capacity428 Wh
Battery chemistryLi-ion NMC
AC output300 W
Surge output1,200 W
DC output120 W
USB-C outputunknown
Solar input120 W
Weight7.4 kg
ConfidenceEstimated
Lifecycle statusUnknown
Source regionGlobal/general sources
Last verified2026-08-27
Catalog notes (original English)

The unit has no USB-C 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%1h 59m
Exceeds a tracked power limit — do not rely on these hours		EstimatedCalculator
CPAP without heated humidifier40 W · 100% · AC inverter · Reserve: 15%7h 44m
Within the tracked power limits; compatibility still needs checking		EstimatedCalculator
Starlink Mini32 W · 100% · USB-C PD · Reserve: 10%11h 4m
Output or startup compatibility is not established		EstimatedCalculator
Wi-Fi router12 W · 100% · AC inverter · Reserve: 10%1d 4h
Within the tracked power limits; compatibility still needs checking		EstimatedCalculator
LED TV100 W · 100% · AC inverter · Reserve: 10%3h 16m
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): 428 WhContinuous output rating (W): 300 WSurge output rating (W): 1200 W
Goal Zero Yeti 400 Lithium
Estimated runtime5h 27m3h 25m – 6h 47mEstimated runtime: 5h 27m, 3h 25m – 6h 47m
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.

5h 27mEstimated runtime: 5h 27m

This setup is tight. Reduce load, use DC where possible, or choose a larger station.

Conservative3h 25m
Estimated5h 27m
Optimistic6h 47m

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
428 Wh
Usable energy
327 Wh
428 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
5h 27m
327 Wh / 60 W = 5h 27m
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

5h 27mThis setup is tight. Reduce load, use DC where possible, or choose a larger station.
Usable energy327 Wh
Average load60 W
Fixed station overheadUnknown (not included)
Running watts60 W
Max surgen/a

Runtime range

Conservative3h 25m
Estimated5h 27m
Optimistic6h 47m

Show your work

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

Usable energy327 Wh428 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 runtime5h 27m327 Wh / 60 W = 5h 27m

Assumptions

  • 428 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: 428 Wh. Size the battery for your measured average load and required hours, including reserve.
  • Tracked output: 300 W. Compare both running demand and startup demand before using any runtime estimate.
  • Solar input limit: 120 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: 7.4 kg. Check the complete carrying setup, cables and battery extensions before choosing this model for travel.
  • unknown: USB-C output

Models: Goal Zero

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

Sources