More info
This power adapter can convert 12V DC Power (Range 9V ~ 15.5V) power to 20V DC power. Maximum output up to 120W
Suitable to fully charge with 12V the following models PowerOak / Bluetti PS1 / AC20, PS5 / EB40 , PS6 (old model) / AC50 (old model), PS7 / AC100 , PS8 / EB150, PS9 / EB180, PS10 / EB240

Features:
- Wide range input voltage: This DC converter can accept input voltage from 9V up to 15.5V.
- Small size, light weight, easy to carry. Weight: 11oz, Dimension: 4.9" x 2.3" x 1.3"
- Suitable to fully charge with 12V the following models PS1, PS5, PS6 (old model), PS7, PS8, PS9, PS10
Specifications:
Input:
- Input Voltage: 9V ~ 15.5V DC
- Input Connector: Car Cigarette Male Plug
- Input Polarity: Positive
- Input cord length: 14"
Output:
- Output voltage: 20V DC
- Maximum output: 120W / 6,0A
- Output connector: 7,9 x 0,9 mm Male
- Output cord length: 40" with ferrite
- Output polarity: Positive
- Adapter Dimension: 4.9" x 2.3" x 1.3"
- Adapter weight: 11oz

The output side has a 7,9 x 0,9 mm male connector like this:

CAUTION: This adapter's input polarity and output polarity are both positive, which means inside should be positive voltage, outside should be ground.