Solar Energy Experiment

I bought more stuff from a solar energy supplier.  I bought the 18AH sealed lead acid battery, PV controller and wires to connect up the system.  My problem is what am I going to do with the energy I collected.    Lights are lowest in energy consumption.  Water pump is good for the water feature.  Otherwise, it is powering laptops or fans.  I wish I can get airconditioning from the solar energy.  However, 20watts is simply too small....