solar regulator

i have recently bought a folding 120 watt solar panel and am not to sure about the controller/ regulator it came with and weather it is putting out to much power for charging my 85ah deep cycle battery. When i test the panels output with a multi-meter the panel is putting out 21v in full sun. The specs for the controller are:
Max Power: 120W
Open Circuit Voltage: 21V
Max Power Current: 6.67A
Max System Voltage: 1000V

i am unsure if the panel voltage drops when connected to a battery as i wasnt game enough to try it when it was putting out 21v into a 12v thought i would ask you all for advice first.

If this is to much power can somone help me as to what i need to regulate the power to charge my battery correctly.






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