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Most charging controllers have three sets of terminals. One set for batteries. A set of access panels. Then, the third group usually displays either LOAD or LVD.
The load output is designed to power all small electronic devices through a charging controller. The function of this output terminal is that if the battery voltage drops below a certain voltage, the charging controller will cut off the output to prevent further battery consumption. If your battery cannot be fully charged every day, some intelligent charging controllers will also adjust this voltage cutoff value.
But this feature is not as useful as it is only suitable for low-power devices. You cannot run inverters through them.