These solar panels are purpose built for Boss Buck feeders. We run 1200lb and 650lb feeders on spin timers. These solar panels let us set them once and come back months later. This helps keep us from disturbing the area during spring and summer time. The panel attaches quickly to the side of the feeder and keeps the batteries charged year around. We have used 8 of these with the longest one in service going on it's fifth year with no problems.