Go Power GP-PWM-30-SB User Manual page 24

Remedy:
1. Check all connections from the controller to the array including
checking for correct wire polarity. Check that all connections are
clean, tight, and secure. Continue with the solutions below for
additional help on low current readings.
Current Reading: Less than expected
Time of Day: Daytime, clear sunny skies
Possible Causes:
(1) Current is being limited below 1 Amp as per normal operation.
(2) Incorrect series/parallel solar panel configuration and/or wiring
connections and/or wire gauge (for multiple panel systems).
(3) Dirty or shaded module or lack of sun.
(4) Blown diode in solar module when two or more modules are
connected in parallel.
How to tell:
(1) Battery State of Charge screen is close to 100% and the Sun and
Battery icons are present with an arrow in between.
(2) Check that the modules and batteries are configured correctly. Check
all wiring connections.
(3) Modules look dirty, overhead object is shading modules or it is an
overcast day in which a shadow cannot be cast.
Avoid any shading no matter how small. An object as
small as a broomstick held across the solar module may
cause the power output to be reduced. Overcast days
may also decrease the power output of the module.
(4) Disconnect one or both array wires from the controller. Take a
voltage reading between the positive and negative array wire. A single
12-volt module should have an open circuit voltage between 17 and 23
VDC. 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 with either the positive or the negative wires disconnected
from the terminal.
GP-PWM-30-SB
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