What does the 'Alarm: OC' error message mean and how do I fix it?
The 'Alarm: OC' Over Current fault occurs when the current exceeds 15% of the rated current (exceeds 34.5A for the 30A controller). This is an overvoltage/overcurrent protection event. Check that your solar array current does not exceed the 30A rating and ensure proper wiring connections. (Page 37)
From the official Upgraded 30A Solar Charge Controller manual, page 37
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