Comes with galvanised steel frame, solar panel and power regulator. The 20w solar panel will keep a 12v 100Ah tractor battery charged while using the b1-11 model energiser. The 20w panel and b1-11 model will fence 40 acres from March to October without having to recharge the battery. This will prolong the life of the 12v 100Ah battery as the battery will be discharged once per year.