Solar BIPV junction box small size: 1.small size with 2.5-4sqmm cable; 2.Nagetive:middle:positive=1:1:1 or 1:2:1 or 1:3:1,three type choose; 3.Max.:15A; 4.With MC3 rubber connector or MC4 connector. info@new-pv.com http://www.new-pv.com/products_show.asp?id=234