... Solar water pump system work sketch map:Daytime connect with solar panels directly,no need battery.Nighttime work with battery.DC submersible solar water pump system ... ,50m,60m,70m,80m,90m,100m,150m for choice.3) Water shortage & voltage/current protection,controller inside. ... with the solar panel directly,daytime no need battery even cloudy. DC 24v submersible solar water pump system for farming 70m ...