A box for connecting an output conductor of a solar panel with a feed cable has a base mountable on the solar panel and having a generally planar floor from whose outer periphery a side wall projects perpendicularly. A cover engageable with the side wall forms with the floor and side wall a substantially closed compartment. At least one holder in the compartment on the floor grips and positions an end of the feed cable such that it extends in a predetermined first direction. The side wall is formed with a cutout through which the feed cable passes. The cutout and holder are relatively spaced and oriented such that the cable extends in a predetermined second direction that forms an acute angle with the first direction between the holder and the cutout.