Grape Solar GS-PWM-20A - 12/24V 20A PWM Charge Controller Manual

Warnings and Tools Icon Chart

Icons	Name	Description
	High Voltage	High voltage device. Installation should be performed by an electrician.
	High Temperature	This device will produce heat. Mount device away from other items.
	Environmental Hazard	Electronic Equipment. Do not put in landfill.
	Wire Cutter	A wire cutter is needed for cutting and stripping wires prior to connection.
	Multimeter	A multimeter is needed for testing equipment and verifying polarity of cables.
	Anti-static Glove	Anti-static gloves are recommended to prevent controller damage caused by static electricity.
	Electrical Tape	Electrical tape is recommended to safely insulate spliced or bare wires.
	Screwdriver	A common size screwdriver is needed when attaching wires to the controller.

Product Features

Thank you for choosing Grape Solar. This PWM solar charge controller is a device for solar charge regulation and direct current output load control. This device is mainly used in small sized o -grid solar power systems.

The Grape Solar PWM-20A charge controllers have these features:

• Charging modes available for most common deep-cycle battery types in the market, including AGM (sealed lead acid batteries), GEL, Flooded, and Lithium mode with customizable parameters.
• Automatic recognition of 12V/24V battery system.
  *Lithium-ion batteries excluded from this feature.
• 5V 1A USB outlet provides charging for mobile devices.
• Provides multiple load control mode options for light based, time based and manually adjusted scenarios.
• Industrial grade design with reverse polarity protection for solar panels, battery and load.

Device Diagram

Mounting Instruction

This controller can be mounted flush or flat with included bracket at a cool, dry and weather safe location.

1. Attach the mounting bracket to the back of the controller using screws.
2. Mark the bracket's mounting holes on the mounting surface.
3. Attach the mounting bracket to the mounting surface using screws.

1. Mark the controller's dimension and mounting holes on the mounting surface.
2. Make necessary alterations to ensure the controller fits into the mounting surface snugly. Pre-install wires if needed (turn to next page for instructions).
3. Attach the controller to the mounting surface using screws.

Wire Connection Sequences

During installation of your PWM controller, please follow below order of connection:

1. Connect the positive battery wire followed by the negative battery wire.
2. Make sure your solar panels are fully covered to prevent electrical shock. Connect the positive solar array output wire followed by the negative solar array output wire.
3. Connect the DC load wiring to the DC load output (if applicable).

LCD Display Interface Overview

Display Section	Display Layout
Charge Status
Charge Mode & Parameter
Active Functions

Status Information

Status Icon	Indication	Status	Description
	Solar Charge Indication	Steady On	Daylight Detected
		Off	No Daylight Detected
		Flowing	Solar Charging Battery
		Flash	Solar System Over Voltage
	Battery Indication	Steady On	Battery Connected and Functional
		Off	No Battery Connection
		Flash	Battery Over-Discharged
	DC Load Indication	Flowing	DC Load On
		Off	DC Load O
		Flash	Over-Load / Short-Circuit

Key Functionality Chart

Function Key	System Mode	Input	Input Function
	View Mode	Long Press	Enter SET mode
		Short Press	View Next Page
	View Mode	Long Press	N/A
		Short Press	Switch Load On/Off (Manual Control Program Only)
	Set Mode	Long Press	Save Data & Exit SET Mode
		Short Press	View Next Page
	Set Mode	Long Press	N/A
		Short Press	Adjust parameter

LCD Display Rules & Cycles

Pre start-up display cycle when the MPPT controller turns on, this usually last several seconds while controller detects operating environment.

LCD Screen Display Cycle

• The battery voltage view will be displayed by default. Use the up and down arrow keys to cycle through different views. The battery voltage view will resume upon 12 seconds of inactivity.

Setting Battery Mode

Advance Battery Settings
In Lithium mode, short press the arrow key again to cycle through each parameter view.

Use the load key to adjust parameter value, then long press arrow key to save and exit.

Load Mode Settings
Enter Load SET Mode by pressing the arrow key in Load Mode view only. Short press the arrow key to cycle through load modes before long pressing the arrow key again to save and exit.

*Contact Grape Solar for live technical support on additional troubleshooting.

The variable "n" is adopted as a multiplying factor when calculating parameter voltages, the rule for "n" is listed as: if battery system voltage is 12V, n=1; 24V, n=2.

For example, the equalize charge voltage for a 12V FLD (Flooded) battery bank is 14.8V*1=14.8V.

The equalizing charge voltage for a 24V FLD (Flooded) battery bank is 14.8V*2=29.6V.

Product Dimension:
130*90*34.6 mm / 5.11*3.54*1.36 inch
Flat Mount Size: 124 mm / 4.88 inch
Flush Mount Size: 130 mm / 5.11 inch
Installation Hole Size: φ3.5 mm / φ0.13 inch