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This 40I 40A solar controller is just for off-grid Solar PV system.

For 12V PV system: 30V for Max input,480W Solar Panel.
For 24V PV system :50V for Max input,960W Solar Panel.
Ideal for Seal lead acid battery,AGM,GEL Battery

3 control modes to choose:

1.Charge Only

2.Light Control

3.Light and 15hours timer control(Settable)

Danger of explosion due to improper handling of batteries!Corrosive hazard by leaking battery acid!Kepp Children away from batteries and acid! Smoking,fire and naked lights are proibited when handling batteries.Prevent sparking and wear eye protection gear during installation.

Solar Modules generated power from light incidence.Even by low light incidence slolar modules carry the full voltage.Therefore,work cautiously and avoid sparking during all work.
Brand New PWM 40A 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,AGM,GEL 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

System Indicator
1.Solar Indictor
off:without enough sun,charge off.
Fast flashing:Buck/equalize charge
Constant on:Acceptance charge
Slow Flashing:Float Charge
2.Battery indicator
Green: Battery Power is full
Orange:Battery power is middle
Red:Battery Power is low
Red Flashing:Battery over discharge
3.Consume indicator
Off:Controller ouput closed
ON:output normal
Slow flashing:Coninus over current
Fast Flahsing: Short Circuit

Data Sheet:
40A series: 12 VOLT or 12/24 VOLT auto work, 40 AMPS (for PV and load)
Over Load protection:
130%(maintain for 60 secs)
160%(maintain for 50 secs)
over-load (immediately shut down)
Equalization voltage: 14.8 Volt
Boost voltage: 14.2 Volt
Float voltage: 13.8 Volt
Low voltage disconnect (LVD) 11.20 Volt
Low voltages reconnect (LVR): 12.6 Volt
Temperature compensation: N/C
Self-consumption: 15mA maximum
Temperature: -35℃ to +55℃

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 0-13 hours.

Lighting control Option
Press the setting button to activate the mode display,press the button for 3 seconds,and select the desired mode.