Voltage Reading: Inaccurate
Time of Day: Daytime/Nighttime
Possible Cause:
Excessive voltage drop from batteries to controller due to loose connections, small wire gauge or both.
Remedy:
Check all connections from the controller to the battery including checking for correct wire polarity. Check that all connections are clean, tight, and secure. Shorten the distance from the controller to battery or obtain larger gauge wire. It is also possible to double up the existing gauge wire (i.e. two wire runs) to simulate a larger gauge wire.
Further Steps (if required):
Check the voltage at the controller 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 VDC, there is an excessive voltage drop.