What is the maximum number of circuits that can be installed in an Enphase Combiner 3?

• A. 4
• B. 2
• C. 6
• D. 8

Answer: (A)

The number of circuits a combiner can handle is defined by how many input positions the unit provides for DC strings and their protection. The Enphase Combiner 3 is designed to accept four separate DC input circuits, each with its own protection. That means you can connect four distinct panel strings, fuse each one, and feed them into the rest of the system from this single box. This limit comes from the internal fuse blocks and the device’s listing—it’s built to safely manage four inputs. If you need more circuits, you’d add another combiner or use a higher-capacity model rather than exceeding this box’s capacity.