I have 3 of these controllers connected to separate 100 watt panels. At 4pm in the Bahamas with good light battery v is at 12.5 with less than 3 amps coming in. Never in the day was the bank of 4 GC-2s near full voltage.
Both lights are always flashing the same on all 3 controllers (2x/sec) whenever I look. All controllers are wired direct to the main panel switch and not direct to the bank if that might matter.
I am looking for an easy answer or at least be able to rule out some possibilities.
Thx