Quick Answer
External DC breakers are generally considered better than integrated ones due to their ease of replacement and ability to be easily isolated from the rest of the system, making them safer and more reliable for off-grid solar applications.
Advantages of External DC Breakers
External DC breakers offer several benefits over integrated ones, particularly in off-grid solar systems. One of the primary advantages is that they can be easily replaced without having to replace the entire panel, saving time and money. This is especially important in remote areas where access to replacement parts may be limited.
For example, a 12V, 30A external DC breaker can be easily swapped out with a new one in case of a fault, whereas an integrated breaker would require the entire panel to be replaced. This can save up to $500 or more, depending on the panel size and type.
Safety and Reliability
External DC breakers also provide a higher level of safety and reliability compared to integrated ones. Because they can be easily isolated from the rest of the system, they reduce the risk of electrical shock and fire hazards. Additionally, external breakers can be easily tested and verified to ensure they are functioning correctly, which is critical in off-grid solar systems where system performance can have a significant impact on daily life.
Sizing Considerations
When sizing external DC breakers for off-grid solar systems, it’s essential to consider the maximum current draw of the system. A general rule of thumb is to select a breaker that can handle 125% of the maximum current draw of the system. For example, if the system has a maximum current draw of 25A, a 31.25A (125% of 25A) external DC breaker would be required. This ensures that the breaker can handle any spikes or surges in the system without failing.
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