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GP-PWM-10 

Wet Cell Battery Charging Algorithm 

Auto Equalize: 

The GP-

PWM-10 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.

 

Viewing the Controller display information 

Solar Panel Abnormal Mode 

LCD 

display 

LED indication 

LCD backlight 

Solar panel weak 

 

 Flash 

ON 

Solar panel reverse connection 

 
 

 Flash 

Flash 

Solar panel over voltage (> 26.5V) 

 
 

 Flash 

Flash 

 

 

 

 

Battery Abnormal 
Mode 

LCD 

display 

LED indication 

LCD backlight 

Battery disconnected 
or less than 3.0V 

 
 

 

Flash

 

 

Flash

 

 

Flash

 

Flash 

Battery reverse 
connection 

 
 

 Flash 

Flash 

Battery over voltage 
than > 17.5V 

 

 Flash 

Flash 

Battery temperature 
over 65C 

 
 

 

Flash

 

 

Flash

 

 

Flash

 

Flash 

 

Solar Controller Abnormal Mode 

LCD Display 

LED indication 

LCD backlight 

The controller over temp. protection 

 

 

Flash 

6.0  Frequently Asked Questions (FAQs) 

Visit gpelectric.com to read the Frequently Asked Questions section on our website. 

Summary of Contents for GP-PWM-10

Page 1: ...Installation Overview 2 2 0 Warnings 2 3 0 Choosing a Location 3 4 0 Installation Instructions 3 5 0 Operating Instructions 4 6 0 Frequently Asked Questions FAQs 5 7 0 Troubleshooting 6 8 0 General Wa...

Page 2: ...20 to 50 C 13 to 122 F Storage Operating Temp 40 to 85 C 40 to 185 F Humidity 100 N C Protection Battery reverse polarity solar array reverse polarity over temp PV short circuit over current 2 0 Warn...

Page 3: ...or other applications please refer to standard wire guide 95 Watt 10 Wire Gauge 160 Watt 10 Wire Gauge Identify the polarity pos and neg on the cable used for the battery and solar module Use colored...

Page 4: ...t Software version test Rated voltage Current test 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 B...

Page 5: ...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 ma...

Page 6: ...troller battery terminals with a voltmeter and compare with the voltage reading at the battery terminals If there is a voltage discrepancy of more than 0 5 V there is an excessive voltage drop Remedy...

Page 7: ...have an open circuit voltage between 17 and 22 volts If you have more than one solar module you will need to conduct this test between the positive and negative terminals of each module junction box...

Page 8: ...minals on the solar controller First connect the battery to the controller and then connect the solar panel to the controller The controller will not work unless there is a battery connected to the ba...

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