A crown cap is couplable to a container. The positioners are programmed to move the ball electrodes simultaneously along a seam line so that the ball electrodes clamp and support opposite sides of a pair of stacked workpieces and are electrically charged to form resistance seam welds along the seam lines to connect the workpieces. A pulley portion may be fixed to the tube portion such that at least a portion of the pulley portion abuts the first longitudinal end of the tube portion. The laser light source is positioned in a second optical path and generates a laser light. A first portion of nodes has a first span type, and a second portion of nodes has a second span type. The photovoltaic assembly includes an inverter module that connects to the docking station through a connector.