Solar Water Pumping
Solar energy can power almost any water pump system. Yet it is most feasible for remote cattle watering systems where costs to extend power lines are high. A solar water pumping systems consists of a solar panel or array attached to the pump providing consistent, free electrical supply. The pump will run when the sun is shining, and can have controls added to turn the pump on or off. Sizing a solar water pump will ensure livestock have enough water during cloudy days; this may be done with either batteries to store electricity or an oversized water tank to store water.
Solar Powered Groundwater Pumping Systems - Colorado State University Extension
Solar Power Livestock Watering Systems - University of Tennessee - Extension