Function:

According to the voltage of battery, controller will adjust the charging current and decide if to supply power to the loads.

Generally keep the battery on full voltage condition.
Prevent the battery from over-charging.
Prevent the battery from over-discharging.
Prevent the battery from supplying power to solar panels during nights.

Indicator light:

There are 3 red LEDs indicating the voltage level of battery. The battery is full when all 3 LEDs are lighting. When 1 or 2 LEDs are lighting, it means the battery is on the low level, where the loads may not working properly. As the voltage of battery reaches 12.6, the loads will automatically resume working.
The battery is being strongly charged when the Charge LED is lighting. The battery is floatingly charged when this LED is flickering, and the battery has stopped charging when the LED is off.
The Load LED indicates the working condition of loads. When it lights, it means the load may work,when it is off, it means the load may not work.

Data Sheet

Rated Voltage:DC12V/24V

Max Current:10A/15A/20A

Full Charge Cut:13.7V/27.4V

Low Voltage Cut:10.5V/21V

Temp compensation:-3mv/degrees C/cell

Zero Load Loses:<20mA

Min Wire Size:<20mA

Min Wire Size:2.5mm^2

Voltage Drop:<210mv

Working temperature: -10~60 degrees C

Storage temperature:-30~70 degrees C

Dimension:95*102*36mm

Weight:0.14KG