Connect the Charge Controller to the Battery first, because this allows the Charge Controller to get calibrated to whether it is 6V or 12V system. Connect the negative terminal first and then positive. Connect the solar panel(negative first and then positive) At last connect the load.
The charge controller load terminal is suitable for only DC load.
How to run an AC Load ?
If you want to run AC appliances then you must need an inverter. Connect the inverter directly to the battery.See the above picture.