E26,
At the risk of starting something...
First thing to consider is what you want to accomplish. Then set the requirements. Then see if you can afford to do it.
I use poly or mono crystal panels and MPPT controllers. I "expect" 60% production at best. Currently I have been able to generate more, but I have a lot of experience.
About batteries, I use good deep cycle batteries. I use 6 volt batteries and set then up in series. I started out with a 12 volt system, but eventually I have upgraded to a 48 volt system. In 12 volts, you will be limited. At 24 volts, you have more options. When you get to 48 volts, you will have a lot of options.
If you are going to do this on a budget, consider getting the right panels for a PWM controller like the Brat and go 24 volts. If you don't use MPPT, you panel selection is paramount. If you use "12" volt panels, you will be waisting 40% of your power just to start with. I currently use the Kid MPPT charge controller and panels that allow for the Vmp to be used while tracking.
If all of this is greek to you, you can still do this but you will not have a best value system. Also, if you are using a step sign-wave inverter, your pump will wear out a lot sooner.
SO simply put, let us know the requirement and the budget and we will see what we can do.
