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Yoshino B4000 SST

Power station · B4000. Specs from the manufacturer page (checked ).

Yoshino B4000 SST
Photo: Yoshino

The Yoshino B4000 SST is a 2611 Wh portable power station with 4000 W rated output and a Li-NCM solid-state battery. It charges to 80% in 90 minutes from 1800 W AC input and is rated for more than 4000 cycles to 80% capacity. Its 20 ms UPS switchover is intended for emergency backup power during outages.

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Capacity
2611Wh
Continuous
4000W
Cycles
4000

Key features

What it is for

Specifications

Capacity2611 Wh
Continuous output4000 W
Cycle life4000 cycles
AC charging80% in Only 90 Minutes (1800W AC)

From the Yoshino page. Values the manufacturer does not publish are left out.

What is in the box

How long it runs common appliances

ApplianceWattsRuns?Hours
Refrigerator (with freezer)120 W (600 start)yes49 h
Chest freezer100 W (500 start)yes69 h
CPAP (no humidifier)35 W (40 start)yes59 h
Gas boiler (pump + controls)120 W (300 start)yes34 h
Wi-Fi router + modem/ONU12 Wyes7.2 days
Starlink (standard dish)60 W (100 start)yes34 h
TV 50"75 Wyes28 h
Sump pump 1/2 HP920 W (2150 start)yes2.2 h
Well pump 1/2 HP880 W (2000 start)yes2.3 h
Space heater 1500 W1500 Wyes2.0 h

Assumes 88 % inverter efficiency, 90 % usable capacity and typical duty cycles. Build your own list in the calculator.

Similar portable power stations

All Yoshino models →

Connection and wiring

Follow the diagrams in the Yoshino manual.

Open the Yoshino manual (PDF) →

Error codes and troubleshooting

CodeMeaningWhat to doManual page
AC/Solar/Car charging high temperature protectionCharging input is too hot, so charging is protected.After the product cools down, it will resume normal operation automatically.19
AC/USB-C PD/DC output high temperature protectionThe product is too hot while supplying AC, USB-C PD, or DC output, so that output is protected.After the product cools down, re-press the AC/USB/DC power button. It will resume normal operation automatically.19
AC/USB-C/USB-C PD/DC output overload protectionThe load on an AC, USB-C, USB-C PD, or DC output exceeds the rated power, so that output is protected.Remove the overloaded device and re-press the AC/USB/DC power button. It will resume normal operation automatically. Use electrical appliances within rated power.19
Battery FailureA battery alarm prompt appears on the LCD during use. It indicates a battery fault.If the prompt appears and does not disappear after restarting, stop using the product immediately and contact Yoshino customer service. Call service if it persists.19
Battery charging high temperature protectionThe battery is too hot while charging, so charging is protected. Charging stops during the protection.Charging can be resumed automatically after the battery cools down. Wait for the battery to cool.19
Battery charging low temperature protectionThe battery is too cold while charging, so charging is protected.Charging can be resumed automatically after battery temperature rises above 0°C (32°F).19

6 of 10 codes. From the Yoshino manual. All 10 B4000 SST / B2000 SST / B660 SST / B330 SST codes →

FAQ

How long will the Yoshino B4000 SST run a refrigerator?

About 49 hours for a typical 120 W refrigerator that runs 35 % of the time, after inverter and depth-of-discharge losses.

Can the Yoshino B4000 SST start a sump pump or well pump?

Starting surge matters more than running watts: this unit is rated 4000 W output (no separate peak published). That covers a typical 1/2 HP sump pump (about 2150 W to start). Use the calculator with your exact pump.

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