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Home > Charge Controller Support > PWM Solar Charge Controller Support > PWM-30-SQ > GP-PWM Solar Charge Controller 30-SQ: Operations
GP-PWM Solar Charge Controller 30-SQ: Operations
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Steps of Operation





Power Up


Please check your battery manufacturer’s specifications to select correct battery type. The unit provides 6 battery types for selections: LTO, Gel, AGM, LiFePO4, 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 LCD meter. The controller will automatically memorize your battery type setting.



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) and Battery Temperature (if external temperature sensor connected).


Battery Charge Profile Chart



Wet Cell Battery Charging Algorithm



Auto Equalize:

The GP-PWM-30-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.


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 the internal cells as an equal states 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. A fully charged LiFePO4 battery has a voltage level of 14.6V. LTO has a voltage level of 13.4V.


Viewing the Controller display information




Products covered in this article: GP-PWM-30-SQ

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