Loud banging or water hammer noise in pipes when solar turns on or off.

Safety first: Turn off the pump before adjusting valves or plumbing. Secure ladders and work carefully around elevated piping.

• Slow valve transitions: If the actuator allows, adjust settings to slow the opening/closing speed or use a controller mode that ramps pump speed before switching the valve.
• Reduce pump speed: For variable-speed pumps, program a lower speed during valve transitions to minimize sudden pressure changes.
• Add hammer arrestor: Consult a plumber to install a water hammer arrestor or air chamber on the solar feed line near the equipment pad.
• Secure piping: Add pipe clamps or supports to long vertical runs to reduce movement and noise.