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.