BULK WIRE, TWO CONDUCTOR JACKETED 10 gauge pair of stranded copper, one red, one black encased in sunlight resistant jacket.
Use this wire if the panels you're using have an older style jubction box rather than more modern MC/MC4/Radox leads. Allow 30 inches per module, plus the length to combiner box. (Only Kyocera SX modules require terminal tips soldered on).
This wire also works great for Shurflo water pumps that have exposed wire to the battery.