Had this happen to me last year, if I recall, a soft reset of the car (holding both scroll buttons on the steering wheel), and then a restart of my phone (last year it was an S24) solved the issue.
Have you looked at Emporia monitors as another option? With their Vue monitor and charger, you can charge only on solar, using only the excess that would ordinarily go back to the grid. If you are off grid not sure if it throttles back once batteries are full, but if so that extra would then...
My R1T gen 2 has the speaker icon on the right of the map (maybe a software selection option somewhere i suppose), but took a while before I learned about x-ing it out to stop the sound disturbance!