Quick Answer
Install DC disconnect switches before the charge controller, ideally within 10-15 feet of the array, and ensure they are easily accessible for maintenance and inspection. This allows for safe isolation of the system from the array. Regularly inspect and test the switches.
Selecting the Right DC Disconnect Switch
When selecting a DC disconnect switch for a solar setup, consider the system voltage, current, and the number of breakers required. For residential solar systems, a 100-200 amp DC disconnect switch is often sufficient, while commercial systems may require higher ampacity breakers. Choose a switch with a low DC current drop to minimize energy losses.
Proper Installation Techniques
Install the DC disconnect switch before the charge controller to prevent damage from high DC currents. Mount the switch within 10-15 feet of the solar array, ideally in a dry, well-ventilated area that is easily accessible for maintenance. Use conduit or cable to connect the switch to the charge controller and array. Ensure the switch is properly sized for the system and can handle the maximum DC current.
Maintenance and Inspection
Regularly inspect and test the DC disconnect switch to ensure it is functioning properly. Check for signs of wear or damage, such as corrosion or overheating. Test the switch by switching it on and off several times to verify it is functioning as intended. Keep a record of maintenance and testing to ensure compliance with local electrical codes and regulations.
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