You must determine the voltage rating for that panel. For example, my panels are rated at 135w at 17 volts, but they do not produce that if connected directly to a discharged battery. In my case, if the battery voltage dropped to 10 volts, then the output of the panel would be
7.5A * 10V = 75 watts
That is not even close to 135 watts, is it?
edit: As a comparison to a MPPT charger, that charger would keep the output voltage of the panel at 17 volts. Since the output is 10 volts, then the charge current would be about 13.5 amps.