ADC problem in Solar charger

I am making a solar charger cum tracker using Arduino UNO.For the tracking I am using 2 servo motors which are powered by an L293D motor shield. The tracker works fine. The problem lies in the charger. I am using a register network which sends the solar voltage to the controller. The LCD display doesn’t show a stable value instead it keeps on fluctuating. I doubt the ADC hasn’t been working properly. Can somebody help me on this matter…

You don't think that a person would need to see the wiring and the code in order to be able to help you? Or do you think we have spy cameras at your house and we've been watching you all along? Or do you think this is a project we've all done before and we all did it exactly the same way you did and had the same problem at some point? How would we even know if we had done the same thing since you haven't shown what you did?