BFL13 wrote:
https://gpelectric.com/wp-content/uploads/2015/06/GP-PWM-30-UL_Manual-with-French_2018-04-10.pdf
Perhaps the controller is right.
First, confirm with your multimeter if the battery bank is indeed at 15.5v or so.
Secondly, if it is, how did that happen? (Is something else charging the batteries that high? Or is your own voltage setting on the controller wrong?---it goes back to not flashing at night when the battery voltage would fall normally with no solar, so it just got too high during the day?)
Currently the battery is around 12.5v or so, been letting the batt's discharge thinking that may reset it (nope, didn't work).
I am thinking that when I hit the BATT DISCONNECT switch and then quickly back on, may have sent a spike to the batt/converter/controller/etc., and caused the over voltage, but honestly I am not sure, that is what I "think" may have happened.
Just by coincidence, I noticed the controller panel on the fritz after that, may have already been like that before from an actual OVER VOLTAGE, just not sure.
So trying to bring it back to normal and see if it happens again.......... then I will know better of what is going on, my fault or if there is and actual OV problem;)