Systems and methods are provided for automatically totalizing materials from multiple feed locations in parallel while mitigating device requirements to monitor such locations. The gutter cover is an elongated panel of sufficient width to bridge a roof to the far side of the gutter. Next, a conductor layer including a lower layer of Cr and an upper layer of aluminum-based material is deposited and patterned to form a data wire include a data line intersecting the gate line, a source electrode, a drain electrode and a data pad. Each scan enable activation element is actuated, to connect its respective subplurality of the plurality of memory elements into the scan chain, by a first enable signal common to more than one of the scan enable activation elements, and a second enable signal for that one of the scan enable activation elements.