Quick Answer
In the United States, the National Electric Code (NEC) requires a disconnecting means within sight of the solar charge controller, but not necessarily a solar-specific breaker. However, some jurisdictions may have additional or more stringent requirements. Consult local authorities for specific regulations.
NEC Disconnect Requirements
The NEC requires a disconnecting means within sight of the solar charge controller to prevent electrical shock and facilitate maintenance. The disconnect must be rated for the maximum system voltage and current, typically 600 volts AC and 60 amps DC. The disconnect can be a dedicated solar disconnect or a main service disconnect, depending on the system configuration.
Solar Breaker Sizing
When sizing a solar breaker, consider the maximum system current and the charge controller’s maximum output current. A general rule of thumb is to size the breaker at 125% of the maximum system current. For example, if the solar array is rated at 12 amps DC, use a 15 amp DC breaker. Be sure to consult the charge controller’s documentation for specific sizing recommendations. It’s also essential to consider the system’s inverter and any other loads connected to the same circuit.
Local Regulations and Inspections
Check with local authorities to determine if a dedicated solar breaker is required. Some jurisdictions may have specific requirements for solar disconnects or breakers. Even if not required, a dedicated solar breaker can provide additional safety and convenience. Be prepared to provide documentation and evidence of proper installation and sizing during inspections.
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