A solar panel beeping typically indicates an error or a status change that requires attention. Common causes for this sound include battery issues, inverter malfunctions, or system alerts. Inspect connections for water damage or loose wiring, 3. Understanding the exact reason behind the beeping can often help in troubleshooting the problem. If the voltage in the solar panels is too low, the inverter may beep to indicate that it is not receiving enough power. And this low voltage problem is mainly due to the fact that. One common reason for a beeping solar inverter is low voltage.