A solar fuse is a device used to protect solar panels, charge controllers, and other components of a solar power system from overcurrent conditions. It is typically rated for a specific current value, which represents the maximum amount of current that can pass through the fuse without it blowing or tripping.
In your case, a solar fuse 15A refers to a solar fuse with a current rating of 15 amperes (A). This means that the fuse is designed to handle a maximum current of 15A before it interrupts the circuit to protect the components. If the current exceeds 15A, the fuse will blow or trip, breaking the circuit and preventing damage to the connected devices.