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Suggested Minimum Wire Gauge
(Cable length 25 ft. max. from solar array to battery bank).
Wire Type
Copper Only, 90°C
IMPORTANT: Identify the polarity (positive and negative) on the cable used for the battery and solar module. Use colored wires or
mark the wire ends with tags. Although the GP-PWM-30-UL is protected, a reverse polarity contact may damage the unit.
Wiring the GP-PWM-30-UL. Wire the GP-PWM-30-UL according to the wiring schematic in Section 7. Run wires from the solar array and
the batteries to the location of the GP-PWM-30-UL. Keep the solar array covered with an opaque material until all wiring is completed.
IMPORTANT: All wiring must be in accordance to National Electrical Code, ANSI/NFPA 70. Always use appropriate circuit protection
on any conductor attached to a battery.
4.
Connect the battery wiring to the controller first and then connect the battery wiring to the battery.
5.
Torque all terminal screws per the following:
Wire Size AWG
10
8
6
4
With battery power attached, the controller should power up and display information. Connect the solar wiring to the controller and
remove the opaque material from the solar array. The negative solar array and battery wiring must be connected directly to the con-
troller for proper operation. Do not connect the negative solar array or negative battery controller wiring to the chassis of the vehicle.
6. Mounting the GP-PWM-30-UL. Mount the GP-PWM-30-UL to the wall using the included four mounting screws.
IMPORTANT: You must set the battery type on the GP-PWM-30-UL before you begin to use the controller (follow steps in Section 7).
The default battery setting is for AGM/LiFePO4 batteries.
Congratulations, your GP-PWM-30-UL should now be operational. If the battery power is low and the solar array is producing power,
your battery should begin to charge.
7. Re-torque: After 30 days of operation, re-torque all terminal screws to ensure the wires are properly secured to the controller.
WARNING: This unit is not provided with a GFDI device. This charge controller must be used with an external GFDI device
as required by Article 690 of the National Electric Code for the installation location.
7. WIRING DIAGRAMS
The GP-PWM-30-UL Maximum 37.5A rating is based on a 30-amp total maximum short circuit current rating (Isc) from the solar modules
nameplate ratings. The National Electric Code specifies the PV equipment/system rating to be 125% of the maximum Isc from the PV
module ratings (1.25 times 30 = 37.5A). E.G. Three modules in parallel with an Isc of 7 amps each equal a total Isc input of 21 amps.
When selecting PV modules for use with the GP-PWM-30-UL do not exceed a total nameplate Isc current of 30A. Solar modules list
the Isc amps on their nameplate label.
[page 8] | gpelectric.com
Wire size min (AWG)
AWG 10
Stranded Copper 90°C Wire
Rated Torque (in-lbs)
7. WIRING DIAGRAMS
Wire size Max (AWG)
20
25
35
35
AWG 4
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