Consider this:
A Renogy 100 watt monocrystalline panel optimally produces 5.29 amps at 18.9 volts. If you are NOT using a
solar charge controller or if you are using a PWM
solar charge controller, I think you will still only get at most 5.29 amps at lower voltages (13 volts, 12 volts, etc). So at 13 volts you would get about 68 watts. So with 2 100 watt panels, you would get about 136 watts.
EDIT: OK, so since you are using a 220 watt panel, you need to look at the specifications for that panel. If you are using NO
solar charge controller or are using a PWM solar charge controller, your resulting wattage will be calculated as the
solar panel amperage multiplied by your actual system voltage (e.g., 13 volts). To take full advantage of the output wattage of the
solar panel, you would have to use an MPPT solar charge controller matched to your solar panel specifications.