Will a 12v DC water pump work if directly connected to solar panels without a battery?
Most of common DC water pumps can work directly connected to the solar panel, but their biggest problem is stuck. At dawn, the sunlight begins to change from weak to strong, when the output voltage of solar panel achieves the starting voltage, the pump will start to work. But at this time the solar panel can’t provide its full performance, the voltage will decrease significantly because of the load. If it drops to a voltage which can’t maintain the pump running, the pump will get stuck.