Owner’s Manual | GP-PWM-25 Regulator
4
© 2009 Carmanah Technologies Corporation
Last revised July 2009
1.0 Installation Overview
1.1 Introduction
A Charge Regulator is an essential component of your photovoltaic (PV) system. The Regulator
maintains the life of the battery by protecting it from overcharging. When your battery has
reached a 100% state of charge, the Regulator prevents overcharging by limiting the current
flowing into the batteries from your solar array.
The GP-PWM-25 is an automatic selecting 12 or 24 volt flush mounted photovoltaic (PV) charge
controller rated for a continuous solar current input of 25 amps. The GP-PWM-25 uses pulse
width modulation technology and a unique four stage charging system and optional equalize
setting to charge and protect your battery bank. The GP-PWM-25 features an LCD digital display
that shows solar array charge current, system battery voltage and battery capacity. The GP-
PWM-25 display has a power saving feature that shuts the display off after 30 minutes of no user
activity
1.2 Specifications
Description Value
Nominal System Voltage
12/24V, automatic selection
Max. Solar Array Current
25 Amps
Battery Voltage Range
6V – 31V
Max. Solar Voltage
56V
Operating Consumption
Display Consumption
6mA
10mA
Absorption Voltage
14.1/14.4V 28.2/28.8V
(25°C / 77°F), 0.5-2h / Day
Float Voltage
13.7/27.4V (25°C / 77°F)
Equalization Voltage
14.8/29.6V (25°C / 77°F),
2h / 28 Day or V < 12.1/24.2
Temperature Compensation
-4mV/cell*K
Operating Temperature
Display Operating Temperature
-40 to 85°C / -40 to 185°F
-20 to 55°C / -4 to 131°F
Humidity 99%
N.C.
Protection
Battery Reverse Polarity,
Solar Array Reverse Polarity
(12V input only), Over
Temperature, PV Short Circuit,
Over Current
The total rated Maximum Power Current (Imp) of the PV
input should not exceed 25 Amps.
The GP-PWM-25 will limit PV current above 25 Amps.
Although the GP-PWM-25 will accept PV current greater than 25
Amps for a short duration, damage may occur if the GP-PWM-
25 operates continuously with greater than 25 Amps of PV input.
Dimensions (H x W x D):
107 x 190 x 35 mm
4.25 x 7.5 x 1.38 in
Weight: 278 grams
10 oz
Maximum Wire Gauge: #6 AWG
Warranty: 5 years
•
PWM
Charging.
•
3 Battery Charging profiles.
•
4 Stage Charging.
•
Monthly Equalize option.
•
Displays Charging Current,
Battery Voltage and Battery
State of Charge.
•
Reverse
Polarity
protected.
•
Temperature
Compensated.
•
RoHS
Compliant,
environmentally safe
•
Accepts over 400 Watts of
solar at 12 volts.
