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Yoshino B4000 SST Runtime Calculator

Quick answer: the Yoshino B4000 SST stores 2,611 Wh and delivers up to 4,000 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 20.0 hours. Last source check: 2026-08-20. This is an estimate, not a guarantee.

Yoshino B4000 SST portable power station
Battery capacity2,611 Wh
AC output4,000 W
Surge output6,000 W
Battery chemistrySolid-State Li-NCM
ConfidenceVerified
Source regionGlobal/general sources
checked2026-08-20
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Yoshino B4000 SST: Key facts
Battery capacity2,611 Wh
Battery chemistrySolid-State Li-NCM
AC output4,000 W
Surge output6,000 W
DC output126 W
USB-C output100 W
Solar input600 W
Weight24.3 kg
ConfidenceVerified
Lifecycle statusUnknown
Source regionGlobal/general sources
Last verified2026-08-20
Catalog notes (original English)

The generic DC field follows the manual's formal 12V output table: 126W total. Yoshino's current product FAQ separately mentions a 48V 3600W CVOUT adapter; that voltage-specific path is not treated as a universal DC ceiling. Solid-State Li-NCM is Yoshino's manufacturer label, not an independent chemistry verification.

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%12h 6m
Within the tracked power limits; compatibility still needs checking		EstimatedCalculator
CPAP without heated humidifier40 W · 100% · AC inverter · Reserve: 15%1d 23h
Within the tracked power limits; compatibility still needs checking		EstimatedCalculator
Starlink Mini32 W · 100% · USB-C PD · Reserve: 10%2d 19h
Within the tracked power limits; compatibility still needs checking		EstimatedCalculator
Wi-Fi router12 W · 100% · AC inverter · Reserve: 10%7d 4h
Within the tracked power limits; compatibility still needs checking		EstimatedCalculator
LED TV100 W · 100% · AC inverter · Reserve: 10%19h 58m
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): 2611 WhContinuous output rating (W): 4000 WSurge output rating (W): 6000 W
Yoshino B4000 SST
Estimated runtime1d 9h20h 50m – 1d 17hEstimated runtime: 1d 9h, 20h 50m – 1d 17h
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.

1d 9hEstimated runtime: 1d 9h

This setup has comfortable headroom for overnight use, assuming the wattage estimate is realistic.

Conservative20h 50m
Estimated1d 9h
Optimistic1d 17h

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
2611 Wh
Usable energy
1997 Wh
2611 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
1d 9h
1997 Wh / 60 W = 1d 9h
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

1d 9hThis setup has comfortable headroom for overnight use, assuming the wattage estimate is realistic.
Usable energy1997 Wh
Average load60 W
Fixed station overheadUnknown (not included)
Running watts60 W
Max surgen/a

Runtime range

Conservative20h 50m
Estimated1d 9h
Optimistic1d 17h

Show your work

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

Usable energy1997 Wh2611 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 runtime1d 9h1997 Wh / 60 W = 1d 9h

Assumptions

  • 2611 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: 2,611 Wh. Size the battery for your measured average load and required hours, including reserve.
  • Tracked output: 4,000 W. Compare both running demand and startup demand before using any runtime estimate.
  • Solar input limit: 600 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: 24.3 kg. Check the complete carrying setup, cables and battery extensions before choosing this model for travel.
  • unknown: —

Models: Yoshino

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

Sources