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20I 20A solar controller is just for off-grid Solar PV system.

For 12V PV system: 21V for Max input,240W Solar Panel.
For 24V PV system :42V for Max input,480W Solar Panel.

3 control modes to choose:

1.Charge Only

2.Light Control

3.Light and 15hours timer control(Settable)

Brand New PWM 20A Solar Charge Controller Panel Regulator 12V 24V The Solar lighting Controller for solar system with automatic lighting control and time functions. The Solar Controller is designed with a microcontroller for automatic lighting control functions. Proven reliability Precise lighting controller PWM battery charging Microcontroller digital accuracy Fully automatic operation 16 field adjustable lighting control options Manual test capability Detects day and night using the PV array Suitable for all 12V /24V lamps Suitable for Seal lead acid battery Temperature compensation

Features:

Microcontroller digital accuracy
PWM Charge mode
State of charge (SOC)
Temperature compensation with external temperature sensor
Detects day and night using the PV array
Big terminals and big distance between terminals

Functions:
Short circuit protection
Reverse polarity protection
Reverse current protection at night
Over charging or discharging protection
Over load protection

20I Data Sheet:
20I series: 12 VOLT or 12/24 VOLT auto work, 20 AMPS (for PV and load)
Equalization voltage: 14.8 Volt
Boost voltage: 14.4 Volt
Float voltage: 13.6 Volt
Low voltage disconnect (LVD) 11.10 Volt
Low voltages reconnect (LVR): 12.6 Volt
Temperature compensation: -30mv/℃/12V
Self-consumption: 6mA maximum
Terminals: for wire sizes to 2.5mm^2
Temperature: -35℃ to +55℃

Display:
4 LED indicators
PV: Green –charging
Battery: Green-Yellow-Red
Load: Red –output on
Red slow flashing& blinking shows mistakes
The fourth double LED shows timers
LED indicator:
Solar Panel LED:
Green ON when solar is charging Battery.
Green blink when the syetem over voltage
Battery LED:
Green ON when battery level in the right range
Green Slowly flashing when battery level full
Yellow ON when battery level low
RED ON when loads cut off.
LOAD LED:
RED ON when the output is on
RED slowly flashing when it`s over load
(the load amps is 1.24 times of rated current for 60 seconds,or the load amps is 1.5 times of rated current for 5 seconds.)
RED blink when the load is short -circuit.

This controller has Light and Timer control Function
Light control:When daylight starts to occur then the light source goes off. Meanwhile the Solar Panels will charge the batteries. when there is no sunlight the garden light will switch on.
Time control:There is an eight hours time control,that means it will go off when the Lights automatically switch off after 0-15 hours.

Lighting control Option
1.Press the power switch for 5 seconds and select the desired LIGHTING CONTROL option.The LED is on,which confirmed you have selected the right one.
2.The controller requires 10 munites of countinuous transiton values before it starts to work.These constraints avoid false transitions due to lighting or dark storm clouds.
3.10 minutes off before the controller start to work
4.A brief description follows belows: