MPPT Upgrade
Looks like you will need to upgrade the existing charge controller if it is a 7Amp PWM. This controller is rated to only handle about 105 watts of solar input, so adding another 100 watt panel will overload the charge controller. If you still have the specifications for the charge controller you can verify this information.
If you do upgrade to MPPT it may be good to upgrade to the 30 Amp controller, this will allow you to have up to 400 watts of solar power input if you decide to add more panels later. The 20 Amp charge controller will max out at 260 watts of solar input.
Good luck!
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