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What is the 120 rule for solar?

The 120 rule is a guideline used in the solar industry to determine the optimal voltage level for a solar panel system.

In general, the 120 rule states that the maximum voltage of a solar panel system should not exceed 120% of the system’s nominal voltage. For example, if you have a 12-volt solar panel system, the maximum voltage of the system should not exceed 14.4 volts.

Exceeding the maximum voltage can lead to several problems, such as reduced efficiency, increased wear and tear on the system components, and even potential safety hazards.

By following the 120 rule, you can ensure that your solar panel system is operating within a safe and optimal voltage range, which can help improve its efficiency and lifespan. However, it’s important to note that the 120 rule is just a guideline, and you should consult with a licensed solar installer to determine the optimal voltage level for your specific solar panel system.