Quick Answer
Solar systems should use DC circuit breakers for the DC side of the electrical panel, but AC circuit breakers are suitable for the AC side due to the complexity and safety requirements of AC wiring.
DC Circuit Breakers for DC Wiring
DC circuit breakers are specifically designed to handle the DC current flow from solar panels and batteries. These breakers are typically rated for 12V, 24V, or 48V systems and are designed to interrupt the DC current in case of a short circuit or overload. For off-grid systems, consider using DC breakers with a short-circuit current rating of at least 200A for 12V systems and 100A for 24V systems.
AC Circuit Breakers for AC Wiring
AC circuit breakers, on the other hand, are designed to handle the alternating current flow from inverters and grid ties. These breakers are typically rated for 120V or 240V systems and are designed to interrupt the AC current in case of a short circuit or overload. When selecting AC breakers, ensure they meet the requirements of the National Electric Code (NEC) and are suitable for the inverter’s output current and voltage rating.
Grounding and Bonding for Safety
Proper grounding and bonding of the electrical panel, including both DC and AC wiring, is crucial for safety and to prevent electrical shock. Ensure all metal components, including the panel, subpanel, and breakers, are properly grounded and bonded to the earth using a grounding rod and bonding jumper. This will help prevent electrical faults from propagating through the system and ensure a safe working environment.
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