USB Charge Requirement

The USB IN is only used for battery charging. It is recommended to use a 5V 2A AC adapter for

battery charging. Lower capacity adapter, such as 5V 1A, may increase the charging period.

USB IN charge input

USB/SOLAR IN Automatic Switching

Both the USB IN and SOLAR IN are capable of deliver 2A max charge current. To prevent charge

conflict caused by using both inputs, the USB charge has a higher priority. When the USB IN is

powered on by AC adapter, the SOLAR IN will be automatically cut off. When the USB IN is powered

down, the SOLAR IN resumes charging.

Regulated Power Supply

The module provides three individual regulated outputs OUT1/USB OUT=5V 1.5A, OUT2=3.3V 1A,

OUT3=9V/12V 0.5A. Output voltage of OUT3 can be set as 9V or 12V through the switch OUT3

SET. OUT1 and USB OUT share the same output voltage and maximum current, but USB OUT CAN

NOT be shutdown.

OUT3 output voltage setting switch

Most of the power banks available on the market has the automatic shutdown function to reduce the

quiescent power under light loads. However, the automatic shutdown threshold is usually higher

than many low power controllers, some even higher than the classical Arduino UNO (around 50mA).

Such power banks will automatically shut itself down when the output current continues lower than

some preset threshold after several seconds, which fails to apply to low power applications. The

USB OUT employs the low quiescent power DC-DC boost converter and always remains ON to

provide continuous power to low power controller.