You my want to try replacing the 1K resistor on the led that indicates 13.5 or so volts with a reed relay with 1k coil resistants.
Then you would have a shunt type regulator you could turn on a dump load
Or disconnect the panels to keep the battery from over charging.
While reed relays have considerable hysteresis, you may still find that turning on the dump load will drop the voltage enough to cause it to drop out, creating an oscilator. B-(
I though of a way to give you an adjustable cutin/out with just a few more components but it's a tad too elaborate to go into here.
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