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Home > Charge Controller Support > PWM Solar Charge Controller Support > PWM-10-SQ > GP-PWM Solar Charge Controller 10-SQ: Operations
GP-PWM Solar Charge Controller 10-SQ: Operations
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How to use the GP-PWM Solar Charge Controller 10-SQ



Power Up


Please check your battery manufacturer’s specifications to select correct battery type. The unit provides 4 battery types for selections: Gel, AGM, WET (conventional lead acid), and Calcium.


Setting the Battery Type / Charging Profile


Press BATTERY TYPE button and hold for 3 seconds to go into your battery type selection mode, the battery types you select will be shown on the bottom row of the LCD display. Press the battery type button individually to select the correct battery type.  The controller will automatically memorize your battery type setting after 5 seconds.



WARNING: Incorrect battery type setting may damage your battery.


When the controller powers on, the unit will run self-test mode and automatically show below items on LCD before going into charging process. Refer to the Battery Charge Profile Chart on for details on each profile.



After going into charging process, the LCD displays the charging states as below. Press VOLT / AMP button in sequence, the LCD will display in turn with Battery Voltage, Charging Current, Charged capacity (Amp-hour). 


Solar controller LED Indicators. 


The red light on the controller below the LCD display, with the picture of a solar panel (as shown below), will be on during the day when the controller sees voltage from the solar panel.  It will be off at night when there is no light on the panel.


The Blue light only comes on if the solar controller is charging the battery.  It will also be off at night.


Other LED light conditions are shown in the chart below:


Battery Charge Profile Chart



Wet Cell Battery Charging Algorithm



Auto Equalize:

The GPPWM-10-SQ has an automatic equalize feature that will charge and recondition your batteries once a month at a higher voltage to ensure that any excess sulfation is removed. This feature is recommended for Flooded batteries only. Check with your battery manufacturer. This feature is only available for wet cell or flooded batteries or if the controller is set to the Flooded profile.


Soft Charge:

When batteries suffer an over-discharge, the controller will softly ramp the battery voltage up to 10V.


Bulk Charge:

Maximum current charging until batteries rise to Absorption level


Absorption Charge:

Constant voltage charging and battery is over 85%


Equalization Charge*:

Only for WET battery (Flooded lead acid) or Calcium battery type, when the battery is deeply drained below 10V, it will automatically run this stage to bring equalize the internal cells and fully complement the loss of capacity. (Gel and AGM battery do not run Equalization charge)


Float Charge:

Battery is fully charged and maintained at a safe level. A fully charged battery has a voltage of more than 13.6 Volts.


Viewing the Controller display information




Products covered in this article: GP-PWM-10-SQ

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