Please contact us if you have any questions about what size combiner box and breakers you need for your particular panels.  This is a very important part of your solar array.  The combiner box takes the multiple parallel strings from your solar panels and runs them through a DC circuit breaker before landing these parallel connections on a common busbar.  For the common + and - busbars, you can use a smaller gauge wire in conduit to complete the wire run from your array back to the charge controller and battery - which is probably a good distance away.

These powder-coated aluminum, rainproof array combiners will accept DIN-rail mounted 150v circuit breakers, MidNite 300VDC breakers, or 600VDC fuse holders for grid-tie arrays. A plastic cover provides a dead front for safety and can be knocked out for either breakers or fuse holders. Both a negative busbar and ground bar are included. The aluminum NEMA 3R enclosures are approved to be mounted at angles from 90 to 14 degrees (14 degrees = 3/12 slope). ETL Listed to UL 1741 for the U.S. and Canada. Breakers and fuse holders are not included. See Electrical Distribution Parts section for breakers, fuses and fuse holders.