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

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.
Key features
- 2611 Wh capacity with 4000 W rated output
- Charges to 80% in 90 minutes on 1800 W AC input
- AC charging modes: Fast, Smart and Eco
- Solar charging with three SP200 solar panels
- 20 ms UPS switchover for 24/7 backup power
- 96% conversion efficiency with GaN technology
- Operating range of -0.4℉ to 140℉, starts in cold without preheating
- Remote control and battery monitoring through the Yoshino app
What it is for
- Home backup during emergency power outages such as hurricanes and earthquakes
Specifications
| Capacity | 2611 Wh |
|---|---|
| Continuous output | 4000 W |
| Cycle life | 4000 cycles |
| AC charging | 80% in Only 90 Minutes (1800W AC) |
From the Yoshino page. Values the manufacturer does not publish are left out.
What is in the box
- B4000 SST Portable Power Station
- AC Charging Cable (5.9ft / 1.8m)
- Cigarette Car Charging Cable (9.8ft / 3m)
- Solar Charging Cable MC4 to XT60 (9.8ft / 3m)
- DC5521 to Cigarette Car Female Output Cable (1.6ft / 0.5m)
- User Manual
How long it runs common appliances
| Appliance | Watts | Runs? | Hours |
|---|---|---|---|
| Refrigerator (with freezer) | 120 W (600 start) | yes | 49 h |
| Chest freezer | 100 W (500 start) | yes | 69 h |
| CPAP (no humidifier) | 35 W (40 start) | yes | 59 h |
| Gas boiler (pump + controls) | 120 W (300 start) | yes | 34 h |
| Wi-Fi router + modem/ONU | 12 W | yes | 7.2 days |
| Starlink (standard dish) | 60 W (100 start) | yes | 34 h |
| TV 50" | 75 W | yes | 28 h |
| Sump pump 1/2 HP | 920 W (2150 start) | yes | 2.2 h |
| Well pump 1/2 HP | 880 W (2000 start) | yes | 2.3 h |
| Space heater 1500 W | 1500 W | yes | 2.0 h |
Assumes 88 % inverter efficiency, 90 % usable capacity and typical duty cycles. Build your own list in the calculator.
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Connection and wiring
Follow the diagrams in the Yoshino manual.
Open the Yoshino manual (PDF) →
Error codes and troubleshooting
| Code | Meaning | What to do | Manual page |
|---|---|---|---|
| AC/Solar/Car charging high temperature protection | Charging 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 protection | The 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 protection | The 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 Failure | A 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 protection | The 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 protection | The 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.