You will lose 50% of your power with the wrong charge controller. The reason I got the MPPT solar panel charge controller is because it makes my solar panel system from 95-97% efficient. Why pay for PV panels and lose 1/2 of that energy using a typical charge controller.
RESOURCES:
How to check if your solar power MPPT is working correct:
http://www.youtube.com/user/knowyourplanet#p/u/8/DZ3JXbvRaZ0
Charge controller recommendations:
Post time: Jun-30-2017