from this post:
That was my first charge controller many many years ago. Get rid of it.
Any other commands you’d like us to obey?
It is a shunt "on, off" device that should be replaced by a good quality PWM or MPPT controller.
Shunt controllers aren’t necessarily bad. They certainly don’t order strangers around.
A configurable shunt controller can be better than a nonconfigurable PWM, at a fraction of the price.
Change the charge controller.