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Given that you have a PWM Go Power controller tells me that you have a nominal 12V 190 watt panel rather than a 24V panel. You can easily wire another 12V 190W or even the more common 200 watt panel in series with the existing panel and use the existing wiring down to the controller. This results in a higher voltage but not a higher current which is good if the existing one is wired to the controller with a 10 gauge cable. You want to minimize the voltage drop which will double if you wire them in parallel but stay the same if wired in series.
But you do have to upgrade to an MPPT controller. You would have to replace the controller anyway because 380 watts is too much for the Go Power 30A controller. The Renogy Rover 40A, about $111 on Amazon is a good choice.
Wire the controller to the batteries with bigger cable than it has right now, again to minimize voltage drop. Use at least #6 cable if it is less than a 10' run.
David
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